Monday, February 28, 2011

RE: [papercreters] Re: What is it that shrinks in papercrete?



portland is by nature more hydroscopic than csa or mag phos cements.



--- On Mon, 2/28/11, JUDITH WILLIAMS <williams_judith@hotmail.com> wrote:

From: JUDITH WILLIAMS <williams_judith@hotmail.com>
Subject: RE: [papercreters] Re: What is it that shrinks in papercrete?
To: "papercreters papercreters" <papercreters@yahoogroups.com>
Date: Monday, February 28, 2011, 4:58 PM

 

Portland works with paper because it never really has to bond. The cellulose fibers swell and separate when soaked and the portland which has been dissolved in water fills in the voids created by the separated fibers. Water leaches away and the matrix of fibers with portland hardens up. Imagine you are pouring water with portland over your head. Let it dry and you will have a cement helmet on your head even though portland does not bond with hair.

They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
~ in Memoirs of the Life and Writings of Benjamin Franklin

Follow progress on the new project at http://www.papercretebyjudith.com/blog

More papercrete info at http://squidoo.com/papercretebyjudith





To: papercreters@yahoogroups.com
From: eogreensticks@gmail.com
Date: Tue, 1 Mar 2011 11:30:51 +1100
Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?

 
the attraction of using magnesium concrete in place of portland for me
is: a)lower energy footprint in manufacture and in curing absorbs CO2
from the atmosphere, b.)possibility of greater water and fireproof
papercrete (my land in NE Tasmania is in bushfire and high rainfall
zone) The papercrete i have made seems good so far but the water does
seem to come through in places-i havent determined yet if this is
related to the shape of the structure? i can't understand why, if
portland repels fibre, it works in papercrete? i have done
experimental stuff with sawdust/clay/portland and so far it is also
good tho i wonder if it may fail after a few years?

On 3/1/11, JUDITH WILLIAMS <williams_judith@hotmail.com> wrote:
>
> Off topic perhaps but I have also live in a male centric culture (northern
> NM macho-Hispanic). I'm not complaining. I do find though that if I go to
> pick up materials or inquire about a product or material that I get
> excellent attention. They seem to think it's amusing to have an over the
> hill woman wanting to know the properties of perlite and such things. In
> fact I quite often go alone even when I have a male volunteer (unless I
> have something really heavy or awkward to load). I find people in general
> and men especially happy to help.
>
> I have not really followed your discussion here and am wondering what your
> motivation is in looking for more things to put in papercrete. Are you
> trying to stretch the cement or make a better product? I tried a few mix
> formulas before I settled on one using things that are cheap, free, and/or
> readily available. Keep up the good work. Everyone has different
> circumstances and anything you find that improves things will help all in
> your area.
>
> They who can give up essential liberty to obtain a little temporary safety,
> deserve neither liberty nor safety.
>
> ~ in Memoirs of the Life and Writings of Benjamin Franklin
>
> Follow progress on the new project at http://www.papercretebyjudith.com/blog
>
> More papercrete info at http://squidoo.com/papercretebyjudith
>
>
>
>
> To: papercreters@yahoogroups.com
> From: eogreensticks@gmail.com
> Date: Mon, 28 Feb 2011 20:43:27 +1100
> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> what does CSA stand for? chemical formula?i wonder if sugar would work
>
> as th retarder, as i understand it will for portland and mag cements?
>
> there is a magnesium cement marketed in th US as Grancrete-here in
>
> Tasmania we dont always get the same products as other places-the
>
> Concrete suppliers are a very male- centric mob,I'm not sure they
>
> quite know what to make of a female inquiring about esoteric concrete
>
> suppllies-it would be good to know what the specific chemical formula
>
> is for CSA if possible?
>
>
>
> On 2/28/11, shahoma prasad <prahoma@yahoo.com> wrote:
>
>> CSA cements are low shrinkage compared to portland and have a lower carbon
>
>> footprint. Another plus is CSA cements bond really well to organic fibers.
>
>> They are also shipped around more than mag phos cements. You can even find
>
>> CSA cements at HD, bagged under the rapid set brand. Youve got to get the
>
>> purple rapid set bags to be getting CSA's.
>
>> Make sure you pick up some retarder while your there, it can go off quick
>
>> without it. A lot of hardy board products are cellulose and CSA blends.
>
>> Another brand is Ultimax Cements out of California.
>
>>
>
>>
>
>>
>
>> --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:
>
>>
>
>> From: eo greensticks <eogreensticks@gmail.com>
>
>> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
>
>> To: papercreters@yahoogroups.com
>
>> Date: Saturday, February 26, 2011, 10:12 PM
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>> fly ash is used in ceramicrete (magnesium concrete) flyash is
>
>>
>
>> byproduct from burning coal-here in Tasmania, coal is mined but
>
>>
>
>> exported so fly ash (along with rice hull ash) is not available-what
>
>>
>
>> about wood ash,would that work? i think magnesium cement would be good
>
>>
>
>> in papercretf as the mag cement is keen to bond with fibre where
>
>>
>
>> portland apparently actually repels fibre. knowing that, i can't
>
>>
>
>> figure why my experiments with paper, sawdust and cloth using portland
>
>>
>
>> have worked so well?there is a whole world of concrete chemistry to
>
>>
>
>> know...
>
>>
>
>>
>
>>
>
>> On 2/26/11, Wayne <huon@intas.net.au> wrote:
>
>>
>
>>> Seems a great idea Dan.
>
>>
>
>>>
>
>>
>
>>> Can any sort of ash be used or does it have to be rice hull? Rice is not
>
>>
>
>>> grown here but I have access to other organic wastes such as trees.
>
>>
>
>>>
>
>>
>
>>> Wayne
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>> Check out the following links, for example.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> It seems that rice hull *ash* is usually used as an additive to
>
>>
>
>>>> concrete, similar to and possibly better than pozzolan.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>
>>
>
>>>> getting twice the bang for your buck.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> Dan
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

RE: [papercreters] Re: What is it that shrinks in papercrete?



Portland works with paper because it never really has to bond. The cellulose fibers swell and separate when soaked and the portland which has been dissolved in water fills in the voids created by the separated fibers. Water leaches away and the matrix of fibers with portland hardens up. Imagine you are pouring water with portland over your head. Let it dry and you will have a cement helmet on your head even though portland does not bond with hair.

They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
~ in Memoirs of the Life and Writings of Benjamin Franklin

Follow progress on the new project at http://www.papercretebyjudith.com/blog

More papercrete info at http://squidoo.com/papercretebyjudith





To: papercreters@yahoogroups.com
From: eogreensticks@gmail.com
Date: Tue, 1 Mar 2011 11:30:51 +1100
Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?

 
the attraction of using magnesium concrete in place of portland for me
is: a)lower energy footprint in manufacture and in curing absorbs CO2
from the atmosphere, b.)possibility of greater water and fireproof
papercrete (my land in NE Tasmania is in bushfire and high rainfall
zone) The papercrete i have made seems good so far but the water does
seem to come through in places-i havent determined yet if this is
related to the shape of the structure? i can't understand why, if
portland repels fibre, it works in papercrete? i have done
experimental stuff with sawdust/clay/portland and so far it is also
good tho i wonder if it may fail after a few years?

On 3/1/11, JUDITH WILLIAMS <williams_judith@hotmail.com> wrote:
>
> Off topic perhaps but I have also live in a male centric culture (northern
> NM macho-Hispanic). I'm not complaining. I do find though that if I go to
> pick up materials or inquire about a product or material that I get
> excellent attention. They seem to think it's amusing to have an over the
> hill woman wanting to know the properties of perlite and such things. In
> fact I quite often go alone even when I have a male volunteer (unless I
> have something really heavy or awkward to load). I find people in general
> and men especially happy to help.
>
> I have not really followed your discussion here and am wondering what your
> motivation is in looking for more things to put in papercrete. Are you
> trying to stretch the cement or make a better product? I tried a few mix
> formulas before I settled on one using things that are cheap, free, and/or
> readily available. Keep up the good work. Everyone has different
> circumstances and anything you find that improves things will help all in
> your area.
>
> They who can give up essential liberty to obtain a little temporary safety,
> deserve neither liberty nor safety.
>
> ~ in Memoirs of the Life and Writings of Benjamin Franklin
>
> Follow progress on the new project at http://www.papercretebyjudith.com/blog
>
> More papercrete info at http://squidoo.com/papercretebyjudith
>
>
>
>
> To: papercreters@yahoogroups.com
> From: eogreensticks@gmail.com
> Date: Mon, 28 Feb 2011 20:43:27 +1100
> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> what does CSA stand for? chemical formula?i wonder if sugar would work
>
> as th retarder, as i understand it will for portland and mag cements?
>
> there is a magnesium cement marketed in th US as Grancrete-here in
>
> Tasmania we dont always get the same products as other places-the
>
> Concrete suppliers are a very male- centric mob,I'm not sure they
>
> quite know what to make of a female inquiring about esoteric concrete
>
> suppllies-it would be good to know what the specific chemical formula
>
> is for CSA if possible?
>
>
>
> On 2/28/11, shahoma prasad <prahoma@yahoo.com> wrote:
>
>> CSA cements are low shrinkage compared to portland and have a lower carbon
>
>> footprint. Another plus is CSA cements bond really well to organic fibers.
>
>> They are also shipped around more than mag phos cements. You can even find
>
>> CSA cements at HD, bagged under the rapid set brand. Youve got to get the
>
>> purple rapid set bags to be getting CSA's.
>
>> Make sure you pick up some retarder while your there, it can go off quick
>
>> without it. A lot of hardy board products are cellulose and CSA blends.
>
>> Another brand is Ultimax Cements out of California.
>
>>
>
>>
>
>>
>
>> --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:
>
>>
>
>> From: eo greensticks <eogreensticks@gmail.com>
>
>> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
>
>> To: papercreters@yahoogroups.com
>
>> Date: Saturday, February 26, 2011, 10:12 PM
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>> fly ash is used in ceramicrete (magnesium concrete) flyash is
>
>>
>
>> byproduct from burning coal-here in Tasmania, coal is mined but
>
>>
>
>> exported so fly ash (along with rice hull ash) is not available-what
>
>>
>
>> about wood ash,would that work? i think magnesium cement would be good
>
>>
>
>> in papercretf as the mag cement is keen to bond with fibre where
>
>>
>
>> portland apparently actually repels fibre. knowing that, i can't
>
>>
>
>> figure why my experiments with paper, sawdust and cloth using portland
>
>>
>
>> have worked so well?there is a whole world of concrete chemistry to
>
>>
>
>> know...
>
>>
>
>>
>
>>
>
>> On 2/26/11, Wayne <huon@intas.net.au> wrote:
>
>>
>
>>> Seems a great idea Dan.
>
>>
>
>>>
>
>>
>
>>> Can any sort of ash be used or does it have to be rice hull? Rice is not
>
>>
>
>>> grown here but I have access to other organic wastes such as trees.
>
>>
>
>>>
>
>>
>
>>> Wayne
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>> Check out the following links, for example.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> It seems that rice hull *ash* is usually used as an additive to
>
>>
>
>>>> concrete, similar to and possibly better than pozzolan.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>
>>
>
>>>> getting twice the bang for your buck.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> Dan
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

Re: [papercreters] Re: What is it that shrinks in papercrete?

the attraction of using magnesium concrete in place of portland for me
is: a)lower energy footprint in manufacture and in curing absorbs CO2
from the atmosphere, b.)possibility of greater water and fireproof
papercrete (my land in NE Tasmania is in bushfire and high rainfall
zone) The papercrete i have made seems good so far but the water does
seem to come through in places-i havent determined yet if this is
related to the shape of the structure? i can't understand why, if
portland repels fibre, it works in papercrete? i have done
experimental stuff with sawdust/clay/portland and so far it is also
good tho i wonder if it may fail after a few years?

On 3/1/11, JUDITH WILLIAMS <williams_judith@hotmail.com> wrote:
>
> Off topic perhaps but I have also live in a male centric culture (northern
> NM macho-Hispanic). I'm not complaining. I do find though that if I go to
> pick up materials or inquire about a product or material that I get
> excellent attention. They seem to think it's amusing to have an over the
> hill woman wanting to know the properties of perlite and such things. In
> fact I quite often go alone even when I have a male volunteer (unless I
> have something really heavy or awkward to load). I find people in general
> and men especially happy to help.
>
> I have not really followed your discussion here and am wondering what your
> motivation is in looking for more things to put in papercrete. Are you
> trying to stretch the cement or make a better product? I tried a few mix
> formulas before I settled on one using things that are cheap, free, and/or
> readily available. Keep up the good work. Everyone has different
> circumstances and anything you find that improves things will help all in
> your area.
>
> They who can give up essential liberty to obtain a little temporary safety,
> deserve neither liberty nor safety.
>
> ~ in Memoirs of the Life and Writings of Benjamin Franklin
>
> Follow progress on the new project at http://www.papercretebyjudith.com/blog
>
> More papercrete info at http://squidoo.com/papercretebyjudith
>
>
>
>
> To: papercreters@yahoogroups.com
> From: eogreensticks@gmail.com
> Date: Mon, 28 Feb 2011 20:43:27 +1100
> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> what does CSA stand for? chemical formula?i wonder if sugar would work
>
> as th retarder, as i understand it will for portland and mag cements?
>
> there is a magnesium cement marketed in th US as Grancrete-here in
>
> Tasmania we dont always get the same products as other places-the
>
> Concrete suppliers are a very male- centric mob,I'm not sure they
>
> quite know what to make of a female inquiring about esoteric concrete
>
> suppllies-it would be good to know what the specific chemical formula
>
> is for CSA if possible?
>
>
>
> On 2/28/11, shahoma prasad <prahoma@yahoo.com> wrote:
>
>> CSA cements are low shrinkage compared to portland and have a lower carbon
>
>> footprint. Another plus is CSA cements bond really well to organic fibers.
>
>> They are also shipped around more than mag phos cements. You can even find
>
>> CSA cements at HD, bagged under the rapid set brand. Youve got to get the
>
>> purple rapid set bags to be getting CSA's.
>
>> Make sure you pick up some retarder while your there, it can go off quick
>
>> without it. A lot of hardy board products are cellulose and CSA blends.
>
>> Another brand is Ultimax Cements out of California.
>
>>
>
>>
>
>>
>
>> --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:
>
>>
>
>> From: eo greensticks <eogreensticks@gmail.com>
>
>> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
>
>> To: papercreters@yahoogroups.com
>
>> Date: Saturday, February 26, 2011, 10:12 PM
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>> fly ash is used in ceramicrete (magnesium concrete) flyash is
>
>>
>
>> byproduct from burning coal-here in Tasmania, coal is mined but
>
>>
>
>> exported so fly ash (along with rice hull ash) is not available-what
>
>>
>
>> about wood ash,would that work? i think magnesium cement would be good
>
>>
>
>> in papercretf as the mag cement is keen to bond with fibre where
>
>>
>
>> portland apparently actually repels fibre. knowing that, i can't
>
>>
>
>> figure why my experiments with paper, sawdust and cloth using portland
>
>>
>
>> have worked so well?there is a whole world of concrete chemistry to
>
>>
>
>> know...
>
>>
>
>>
>
>>
>
>> On 2/26/11, Wayne <huon@intas.net.au> wrote:
>
>>
>
>>> Seems a great idea Dan.
>
>>
>
>>>
>
>>
>
>>> Can any sort of ash be used or does it have to be rice hull? Rice is not
>
>>
>
>>> grown here but I have access to other organic wastes such as trees.
>
>>
>
>>>
>
>>
>
>>> Wayne
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>> Check out the following links, for example.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> It seems that rice hull *ash* is usually used as an additive to
>
>>
>
>>>> concrete, similar to and possibly better than pozzolan.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>
>>
>
>>>> getting twice the bang for your buck.
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>>
>
>>
>
>>>> Dan
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

[papercreters] Re: What is it that shrinks in papercrete?



I don’t know if they would act the same.  The important thing about RHA  (RHA is Rice Hull Ash) is the particle size and the amount of silica in it.    I’m not a chemist…  See some quotes below.  The second article implies that it could be used.

 

Dan

 

“While it shares some properties of other mineral admixtures, the key to RHA’s effectiveness is its particle surface. RHA’s average particle size is comparable to that of fly ash, and RHA’s silica content and degree of reactivity are comparable to silica fume’s.

 

“Silica in pozzolans reacts with portland cement paste’s weak and easily soluble calcium hydroxide to form stronger-bonding calcium silicate hydrates. In hardened concrete, more calcium silicate hydrates mean less capillary porosity and less permeability. This pozzolanic reaction also reduces the presence of soluble, alkaline calcium hydrates, which can leach out and weaken concrete.

 

“RHA used in concrete has an effect similar to other pozzolans. Research indicates a 10% replacement of the weight of cement by RHA produces higher compressive, tensile, and flexural strengths than ordinary concrete but slightly lower strengths than silica fume/cement concrete. “  ftp://66.151.101.167/woc/J970499.PDF

 

 

http://lejpt.academicdirect.org/A08/09_16.htm 

 

Characteristics of Wood ASH/OPC Concrete

 

“Wood ash in this study is an admixture: a pozzolana. A pozzolana is a material rich in silica and alumina which in itself has little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties [3]. Wood ash is obtained from the combustion of wood. It can be related to fly ash since fly ash is obtained from coal, which is a fossilized wood [4]. Rice husk ash is also of plant origin. This implies that wood ash could be used as a pozzolana in concrete. Tarun, Rudolph and Rafat [5] reported the following elements in wood ash: carbon (5% to 30%), calcium (5% to 30%), carbon (7% to 33%), potassium (3% to 4%), magnesium (1% to 2%), phosphorus (0.3% to 1.4%) and sodium (0.2% to 0.5%). The following compound composition limits were also reported: SiO2 (4% to 60%), Al2O3 (5% to 20%), Fe2 O3 (10% to 90%), CaO (2% to 37%), MgO (0.7% to 5%), TiO2 (0% to 1.5%), K2O (0.4% to 14%), SO3 (0.1% to 15%), LOI (0.1% to 33%), moisture content (0.1% to 22%), and available alkalis (0.4% to 20%). The study revealed that all the major compounds present in wood ash are present in fly ash.”

 

 

 

Re: What is it that shrinks in papercrete?

Posted by: "Wayne" huon@intas.net.au   casaway67

Fri Feb 25, 2011 5:28 pm (PST)



Seems a great idea Dan.

Can any sort of ash be used or does it have to be rice hull? Rice is not
grown here but I have access to other organic wastes such as trees.

Wayne

> Check out the following links, for example.
>
>
>
> It seems that rice hull *ash* is usually used as an additive to
> concrete, similar to and possibly better than pozzolan.
>
>
>
> Perhaps you could use both rice hulls and rice hull ash in your mix,
> getting twice the bang for your buck.
>
>
>
> Dan

 



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

[papercreters] Re: What is it that shrinks in papercrete?

I googled it and got this answer.

CSA cement (Calcium Sulpho aluminate Cement)
http://www.csacement.com/

Tim

--- In papercreters@yahoogroups.com, eo greensticks <eogreensticks@...> wrote:
>
> what does CSA stand for? chemical formula?i wonder if sugar would work
> as th retarder, as i understand it will for portland and mag cements?
> there is a magnesium cement marketed in th US as Grancrete-here in
> Tasmania we dont always get the same products as other places-the
> Concrete suppliers are a very male- centric mob,I'm not sure they
> quite know what to make of a female inquiring about esoteric concrete
> suppllies-it would be good to know what the specific chemical formula
> is for CSA if possible?
>
> On 2/28/11, shahoma prasad <prahoma@...> wrote:
> > CSA cements are low shrinkage compared to portland and have a lower carbon
> > footprint. Another plus is CSA cements bond really well to organic fibers.
> > They are also shipped around more than mag phos cements. You can even find
> > CSA cements at HD, bagged under the rapid set brand. Youve got to get the
> > purple rapid set bags to be getting CSA's.
> > Make sure you pick up some retarder while your there, it can go off quick
> > without it. A lot of hardy board products are cellulose and CSA blends.
> > Another brand is Ultimax Cements out of California.
> >
> >
> >
> > --- On Sat, 2/26/11, eo greensticks <eogreensticks@...> wrote:
> >
> > From: eo greensticks <eogreensticks@...>
> > Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
> > To: papercreters@yahoogroups.com
> > Date: Saturday, February 26, 2011, 10:12 PM
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > fly ash is used in ceramicrete (magnesium concrete) flyash is
> >
> > byproduct from burning coal-here in Tasmania, coal is mined but
> >
> > exported so fly ash (along with rice hull ash) is not available-what
> >
> > about wood ash,would that work? i think magnesium cement would be good
> >
> > in papercretf as the mag cement is keen to bond with fibre where
> >
> > portland apparently actually repels fibre. knowing that, i can't
> >
> > figure why my experiments with paper, sawdust and cloth using portland
> >
> > have worked so well?there is a whole world of concrete chemistry to
> >
> > know...
> >
> >
> >
> > On 2/26/11, Wayne <huon@...> wrote:
> >
> >> Seems a great idea Dan.
> >
> >>
> >
> >> Can any sort of ash be used or does it have to be rice hull? Rice is not
> >
> >> grown here but I have access to other organic wastes such as trees.
> >
> >>
> >
> >> Wayne
> >
> >>
> >
> >>
> >
> >>
> >
> >>> Check out the following links, for example.
> >
> >>>
> >
> >>>
> >
> >>>
> >
> >>> It seems that rice hull *ash* is usually used as an additive to
> >
> >>> concrete, similar to and possibly better than pozzolan.
> >
> >>>
> >
> >>>
> >
> >>>
> >
> >>> Perhaps you could use both rice hulls and rice hull ash in your mix,
> >
> >>> getting twice the bang for your buck.
> >
> >>>
> >
> >>>
> >
> >>>
> >
> >>> Dan
> >
> >>
> >
> >>
> >
> >>
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

RE: [papercreters] Re: What is it that shrinks in papercrete?



Off topic perhaps but I have also live in a male centric culture (northern NM macho-Hispanic). I'm not complaining. I do find though that if I go to pick up materials or inquire about a product or material that I get excellent attention. They seem to think it's amusing to have an over the hill woman wanting to know the properties of perlite and such things. In fact I quite often go alone even when I have a  male volunteer (unless I have something really heavy or awkward to load). I find people in general and men especially happy to help.

I have not really followed your discussion here and am wondering what your motivation is in looking for more things to put in papercrete. Are you trying to stretch the cement or make a better product? I tried a few mix formulas before I settled on one using things that are cheap, free, and/or readily available. Keep up the good work. Everyone has different circumstances and anything you find that improves things will help all in your area.

They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
~ in Memoirs of the Life and Writings of Benjamin Franklin

Follow progress on the new project at http://www.papercretebyjudith.com/blog

More papercrete info at http://squidoo.com/papercretebyjudith





To: papercreters@yahoogroups.com
From: eogreensticks@gmail.com
Date: Mon, 28 Feb 2011 20:43:27 +1100
Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?

 
what does CSA stand for? chemical formula?i wonder if sugar would work
as th retarder, as i understand it will for portland and mag cements?
there is a magnesium cement marketed in th US as Grancrete-here in
Tasmania we dont always get the same products as other places-the
Concrete suppliers are a very male- centric mob,I'm not sure they
quite know what to make of a female inquiring about esoteric concrete
suppllies-it would be good to know what the specific chemical formula
is for CSA if possible?

On 2/28/11, shahoma prasad <prahoma@yahoo.com> wrote:
> CSA cements are low shrinkage compared to portland and have a lower carbon
> footprint. Another plus is CSA cements bond really well to organic fibers.
> They are also shipped around more than mag phos cements. You can even find
> CSA cements at HD, bagged under the rapid set brand. Youve got to get the
> purple rapid set bags to be getting CSA's.
> Make sure you pick up some retarder while your there, it can go off quick
> without it. A lot of hardy board products are cellulose and CSA blends.
> Another brand is Ultimax Cements out of California.
>
>
>
> --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:
>
> From: eo greensticks <eogreensticks@gmail.com>
> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
> To: papercreters@yahoogroups.com
> Date: Saturday, February 26, 2011, 10:12 PM
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> fly ash is used in ceramicrete (magnesium concrete) flyash is
>
> byproduct from burning coal-here in Tasmania, coal is mined but
>
> exported so fly ash (along with rice hull ash) is not available-what
>
> about wood ash,would that work? i think magnesium cement would be good
>
> in papercretf as the mag cement is keen to bond with fibre where
>
> portland apparently actually repels fibre. knowing that, i can't
>
> figure why my experiments with paper, sawdust and cloth using portland
>
> have worked so well?there is a whole world of concrete chemistry to
>
> know...
>
>
>
> On 2/26/11, Wayne <huon@intas.net.au> wrote:
>
>> Seems a great idea Dan.
>
>>
>
>> Can any sort of ash be used or does it have to be rice hull? Rice is not
>
>> grown here but I have access to other organic wastes such as trees.
>
>>
>
>> Wayne
>
>>
>
>>
>
>>
>
>>> Check out the following links, for example.
>
>>>
>
>>>
>
>>>
>
>>> It seems that rice hull *ash* is usually used as an additive to
>
>>> concrete, similar to and possibly better than pozzolan.
>
>>>
>
>>>
>
>>>
>
>>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>
>>> getting twice the bang for your buck.
>
>>>
>
>>>
>
>>>
>
>>> Dan
>
>>
>
>>
>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

Re: [papercreters] Re: What is it that shrinks in papercrete?



It doesnt take much to google more info than one would ever need about CSA cements, its no secret. Here is a brief overview done for the countertop industry..
http://www.concretecountertopinstitute.com/library.item.60/csa-cements-rapid-strength-with-a-low-carbon-footprint.html



--- On Mon, 2/28/11, eo greensticks <eogreensticks@gmail.com> wrote:

From: eo greensticks <eogreensticks@gmail.com>
Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
To: papercreters@yahoogroups.com
Date: Monday, February 28, 2011, 1:43 AM

 

what does CSA stand for? chemical formula?i wonder if sugar would work
as th retarder, as i understand it will for portland and mag cements?
there is a magnesium cement marketed in th US as Grancrete-here in
Tasmania we dont always get the same products as other places-the
Concrete suppliers are a very male- centric mob,I'm not sure they
quite know what to make of a female inquiring about esoteric concrete
suppllies-it would be good to know what the specific chemical formula
is for CSA if possible?

On 2/28/11, shahoma prasad <prahoma@yahoo.com> wrote:
> CSA cements are low shrinkage compared to portland and have a lower carbon
> footprint. Another plus is CSA cements bond really well to organic fibers.
> They are also shipped around more than mag phos cements. You can even find
> CSA cements at HD, bagged under the rapid set brand. Youve got to get the
> purple rapid set bags to be getting CSA's.
> Make sure you pick up some retarder while your there, it can go off quick
> without it. A lot of hardy board products are cellulose and CSA blends.
> Another brand is Ultimax Cements out of California.
>
>
>
> --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:
>
> From: eo greensticks <eogreensticks@gmail.com>
> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
> To: papercreters@yahoogroups.com
> Date: Saturday, February 26, 2011, 10:12 PM
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> fly ash is used in ceramicrete (magnesium concrete) flyash is
>
> byproduct from burning coal-here in Tasmania, coal is mined but
>
> exported so fly ash (along with rice hull ash) is not available-what
>
> about wood ash,would that work? i think magnesium cement would be good
>
> in papercretf as the mag cement is keen to bond with fibre where
>
> portland apparently actually repels fibre. knowing that, i can't
>
> figure why my experiments with paper, sawdust and cloth using portland
>
> have worked so well?there is a whole world of concrete chemistry to
>
> know...
>
>
>
> On 2/26/11, Wayne <huon@intas.net.au> wrote:
>
>> Seems a great idea Dan.
>
>>
>
>> Can any sort of ash be used or does it have to be rice hull? Rice is not
>
>> grown here but I have access to other organic wastes such as trees.
>
>>
>
>> Wayne
>
>>
>
>>
>
>>
>
>>> Check out the following links, for example.
>
>>>
>
>>>
>
>>>
>
>>> It seems that rice hull *ash* is usually used as an additive to
>
>>> concrete, similar to and possibly better than pozzolan.
>
>>>
>
>>>
>
>>>
>
>>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>
>>> getting twice the bang for your buck.
>
>>>
>
>>>
>
>>>
>
>>> Dan
>
>>
>
>>
>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

Re: [papercreters] Re: What is it that shrinks in papercrete?

what does CSA stand for? chemical formula?i wonder if sugar would work
as th retarder, as i understand it will for portland and mag cements?
there is a magnesium cement marketed in th US as Grancrete-here in
Tasmania we dont always get the same products as other places-the
Concrete suppliers are a very male- centric mob,I'm not sure they
quite know what to make of a female inquiring about esoteric concrete
suppllies-it would be good to know what the specific chemical formula
is for CSA if possible?

On 2/28/11, shahoma prasad <prahoma@yahoo.com> wrote:
> CSA cements are low shrinkage compared to portland and have a lower carbon
> footprint. Another plus is CSA cements bond really well to organic fibers.
> They are also shipped around more than mag phos cements. You can even find
> CSA cements at HD, bagged under the rapid set brand. Youve got to get the
> purple rapid set bags to be getting CSA's.
> Make sure you pick up some retarder while your there, it can go off quick
> without it. A lot of hardy board products are cellulose and CSA blends.
> Another brand is Ultimax Cements out of California.
>
>
>
> --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:
>
> From: eo greensticks <eogreensticks@gmail.com>
> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
> To: papercreters@yahoogroups.com
> Date: Saturday, February 26, 2011, 10:12 PM
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> fly ash is used in ceramicrete (magnesium concrete) flyash is
>
> byproduct from burning coal-here in Tasmania, coal is mined but
>
> exported so fly ash (along with rice hull ash) is not available-what
>
> about wood ash,would that work? i think magnesium cement would be good
>
> in papercretf as the mag cement is keen to bond with fibre where
>
> portland apparently actually repels fibre. knowing that, i can't
>
> figure why my experiments with paper, sawdust and cloth using portland
>
> have worked so well?there is a whole world of concrete chemistry to
>
> know...
>
>
>
> On 2/26/11, Wayne <huon@intas.net.au> wrote:
>
>> Seems a great idea Dan.
>
>>
>
>> Can any sort of ash be used or does it have to be rice hull? Rice is not
>
>> grown here but I have access to other organic wastes such as trees.
>
>>
>
>> Wayne
>
>>
>
>>
>
>>
>
>>> Check out the following links, for example.
>
>>>
>
>>>
>
>>>
>
>>> It seems that rice hull *ash* is usually used as an additive to
>
>>> concrete, similar to and possibly better than pozzolan.
>
>>>
>
>>>
>
>>>
>
>>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>
>>> getting twice the bang for your buck.
>
>>>
>
>>>
>
>>>
>
>>> Dan
>
>>
>
>>
>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

[papercreters] Rice Husk Ash




 Dear Wayne,
Rice Husk Ash is special because it almost entirely consists of silica and is a water repellent, in addition to being pozollonic.
Must other orgainc ash come no where close to rice husk ash in terms of silical content.
The closet approximation ( hich is also far way) is Sugar cane Ash ( also called baggase Ash)
Ashok




__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

Sunday, February 27, 2011

Re: [papercreters] Re: What is it that shrinks in papercrete?



CSA cements are low shrinkage compared to portland and have a lower carbon footprint. Another plus is CSA cements bond really well to organic fibers. They are also shipped around more than mag phos cements. You can even find CSA cements at HD, bagged under the rapid set brand. Youve got to get the purple rapid set bags to be getting CSA's.
Make sure you pick up some retarder while your there, it can go off quick without it. A lot of hardy board products are cellulose and CSA blends.
Another brand is Ultimax Cements out of California.



--- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote:

From: eo greensticks <eogreensticks@gmail.com>
Subject: Re: [papercreters] Re: What is it that shrinks in papercrete?
To: papercreters@yahoogroups.com
Date: Saturday, February 26, 2011, 10:12 PM

 

fly ash is used in ceramicrete (magnesium concrete) flyash is
byproduct from burning coal-here in Tasmania, coal is mined but
exported so fly ash (along with rice hull ash) is not available-what
about wood ash,would that work? i think magnesium cement would be good
in papercretf as the mag cement is keen to bond with fibre where
portland apparently actually repels fibre. knowing that, i can't
figure why my experiments with paper, sawdust and cloth using portland
have worked so well?there is a whole world of concrete chemistry to
know...

On 2/26/11, Wayne <huon@intas.net.au> wrote:
> Seems a great idea Dan.
>
> Can any sort of ash be used or does it have to be rice hull? Rice is not
> grown here but I have access to other organic wastes such as trees.
>
> Wayne
>
>
>
>> Check out the following links, for example.
>>
>>
>>
>> It seems that rice hull *ash* is usually used as an additive to
>> concrete, similar to and possibly better than pozzolan.
>>
>>
>>
>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>> getting twice the bang for your buck.
>>
>>
>>
>> Dan
>
>
>



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

Re: [papercreters] Re: What is it that shrinks in papercrete?

fly ash is used in ceramicrete (magnesium concrete) flyash is
byproduct from burning coal-here in Tasmania, coal is mined but
exported so fly ash (along with rice hull ash) is not available-what
about wood ash,would that work? i think magnesium cement would be good
in papercretf as the mag cement is keen to bond with fibre where
portland apparently actually repels fibre. knowing that, i can't
figure why my experiments with paper, sawdust and cloth using portland
have worked so well?there is a whole world of concrete chemistry to
know...

On 2/26/11, Wayne <huon@intas.net.au> wrote:
> Seems a great idea Dan.
>
> Can any sort of ash be used or does it have to be rice hull? Rice is not
> grown here but I have access to other organic wastes such as trees.
>
> Wayne
>
>
>
>> Check out the following links, for example.
>>
>>
>>
>> It seems that rice hull *ash* is usually used as an additive to
>> concrete, similar to and possibly better than pozzolan.
>>
>>
>>
>> Perhaps you could use both rice hulls and rice hull ash in your mix,
>> getting twice the bang for your buck.
>>
>>
>>
>> Dan
>
>
>


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

Friday, February 25, 2011

Re: [papercreters] Re: What is it that shrinks in papercrete?

Seems a great idea Dan.

Can any sort of ash be used or does it have to be rice hull? Rice is not
grown here but I have access to other organic wastes such as trees.

Wayne

> Check out the following links, for example.
>
>
>
> It seems that rice hull *ash* is usually used as an additive to
> concrete, similar to and possibly better than pozzolan.
>
>
>
> Perhaps you could use both rice hulls and rice hull ash in your mix,
> getting twice the bang for your buck.
>
>
>
> Dan


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

[papercreters] Re: What is it that shrinks in papercrete?



Check out the following links, for example.

 

It seems that rice hull *ash* is usually used as an additive to concrete, similar to and possibly better than pozzolan.

 

Perhaps you could use both rice hulls and rice hull ash in your mix, getting twice the bang for your buck.

 

Dan

 

 

http://finance.dir.groups.yahoo.com/group/cheap-shelters/message/8836

 

http://www.voanews.com/learningenglish/home/agriculture/a-23-2009-11-30-voa2-83140747.html

 

ftp://66.151.101.167/woc/J970499.PDF

 

 

 

 

 

 

Re: What is it that shrinks in papercrete?

Posted by: "karl88" indiakarl@yahoo.com   indiakarl

Thu Feb 24, 2011 6:25 am (PST)

best way to find out about any of those add-ins is to test them out! papercrete itself came about because someone thought "hey, i wonder if i could substitute paper pulp for sand and rocks in concrete." try some of them ideas out and let us know what works.

my home is in Thailand. i can get bags of rice hulls for a few cents. i tried making hyper-tufa with them - because the usual other ingredients: peat moss and perlite/vermiculite are not available there... i asked everywhere in the area. what i didn't try was soaking the rice-hulls in water to soften them before adding cement. that mighta worked better, and i'll try it next time i'm home.

go for it!

> --- In papercreters@yahoogroups.com, "foodforestdude" <steven.ivy@> wrote:
> >
> > I was just wondering what is it exactly that causes the shrinkage we see in so many mixes of PC?
> >
> > Is ir as I assume, the paper cellulose fibers?
> >
> > So even if it means not using paper, what other admixtures could be added to decrease the shrinking problem and not give up the nice tensile and insulation properties?
> >
> > Some substances I have considered as "papercrete" ad-mixtures...
> >
> > Sawdust, Lawn grass clippings, ground and sifted dried leaves, Pulverized bamboo, Vertiver grass (long, medium, and, or short fiber versions),
> > Shredded plastic bottles, broken glass bottles (may want to polish this material for beauty), Shredded plastic shopping bags, Shredded up old carpet, Shredded up old clothing, shredded old rubber tires, Mulched tree bark and or twigs, wheat straw, shredded scrap wood from regular construction, pine needles, Shredded old tar roof waste, rice hulls, peanut hulls, some sort of a human healthy dried fungus...
> >
> > So what do you think? Any of that worth a shot?
> >
>

 



__._,_.___


Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___

Friday, February 18, 2011

[papercreters] Re: my first posting

Dan,

Good eye. You are correct. 100 pnds of other ingredients would only use a 1/2 pound of boric acid to be at 1/2%.

Gary

------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

Wednesday, February 16, 2011

[papercreters] Re: my first posting

You wrote: "I suspect the concentration is about 1/2% by weight. So 100 pounds of cellulose fiber insulation may contain about 5 pounds of boric acid."

1/2% of 100 pounds is 1/2 pound, not 5 pounds.

Dan

--- In papercreters@yahoogroups.com, "Gary Olsen" <gobug@...> wrote:
>
> Boric acid is a stomach poison to some bugs. That is pure boric acid. It is also the active ingredient in many baits, but then it is only about 1/2% active ingredient. Either the insects that eat it or the ones that clean it off themselves die from stomach poisoning.
>
> As a wood preservative it is formulated with propylene glycol and absorbed by capillary action through the wood. In this formulation, it is not a bait. Termites do not carry home boric acid treated wood and poison their colony. As applied, it is a repellent. The termites just stay away. I believe the cellulose fiber is similar. It prevents fungi and rodents as well in that application.
>
> Ant baits are different than termite baits. There are many baits on the market which use other pesticides. A bait is carried home and shared with the rest of the colony. Termite baits are not boric acid (at least not while I was exterminating). Termite baits rely on the product being carried back to the colony and shared. Boric acid doesn't seem to work that way with the termites.
>
> Since cellulose fiber insulation is not usually in the part of the structure which the termites attack (like the foundation base plate), and that it professes no mold or fungi or mice, I suspect the concentration is about 1/2% by weight. So 100 pounds of cellulose fiber insulation may contain about 5 pounds of boric acid.
>
> Since papercrete is pulverized cellulose, I don't think the polyethylene glycol would be needed. I also do not know if the alkalai action of the cement has any impact on the boric acid. I suppose the truth would take some testing to confirm.
> Gary
>


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/papercreters/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/papercreters/join
(Yahoo! ID required)

<*> To change settings via email:
papercreters-digest@yahoogroups.com
papercreters-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
papercreters-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/