Re: [papercreters] WAS small movable mold NOW Blackjack

Has anyone put Blackjack on an exposed papercrete structure?
I've put it on old composite roofing, and it works great for that.
TASHA

On 12/9/2013 8:29 AM, doglover1918 . wrote:

Part way down this page is a photo of Ian Sands with blocks he poured into shaped forms for a dome. I thought this was a fabulous idea,but I've never moved past the admiration stage.

http://papercretenm.com/building-with-papercrete.htm

Tina in Colorado

               

On Sun, Dec 8, 2013 at 5:52 PM, <diggingfortreasure@yahoo.ca> wrote:

 

Look at this igloo making tool that uses snow.....I wonder if a person could adapt such an idea for placing papercrete block by block?

http://www.grandshelters.com/index.html

 

Jackie

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Re: [papercreters] small movable mold?

This looks like a slip form to me, with the added radius connection for forming domes. I used a similar scheme when I did a tire dome, a measurement attached to the center of the sphere and used to place each tire. For years I dreamed of using a commercial curb machine, like is used to make the curbs along streets, but tethered to a dome center instead of guided along a straight line.

On 12/8/2013 5:52 PM, diggingfortreasure@yahoo.ca wrote:

Look at this igloo making tool that uses snow.....I wonder if a person could adapt such an idea for placing papercrete block by block?

http://www.grandshelters.com/index.html

 

Jackie

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Re: [papercreters] small movable mold?

Part way down this page is a photo of Ian Sands with blocks he poured into shaped forms for a dome. I thought this was a fabulous idea,but I've never moved past the admiration stage.

http://papercretenm.com/building-with-papercrete.htm

Tina in Colorado

               

On Sun, Dec 8, 2013 at 5:52 PM, <diggingfortreasure@yahoo.ca> wrote:

 

Look at this igloo making tool that uses snow.....I wonder if a person could adapt such an idea for placing papercrete block by block?

http://www.grandshelters.com/index.html

 

Jackie

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[papercreters] small movable mold?

Look at this igloo making tool that uses snow.....I wonder if a person could adapt such an idea for placing papercrete block by block?

http://www.grandshelters.com/index.html

 

Jackie

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Re: [papercreters] Re: FLYASH..rice hulls/ash (RHA)

I'm not sure about refractory cement. I think the clay content and type is what allows it to be used in a fireplace, or high temperature variable space.

Heavy metals, if in the flyash would be bound up in the cured mix, wouldn't they? Isn't the risk with heavy metals getting them into your body?

I recall a recent patent for a very porous non-alkali cement filter that allowed 3 strains of bacteria to live in the cement after cure. It purified contaminated water making a brackish pond clear in a short time. The cement was not Portland but a geopolymer cement (not affordable for me).

Gary

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Re: [papercreters] Re: FLYASH..rice hulls/ash (RHA)

i like the plasticity part and get what you are saying about 'toxixity'-just had some memory bells ringing about 

heavy metals or similar in flyash that i wouldn't want washing or blowing into my garden and living areas (i do sculpture and work in my backyard!)

i realize that portland itself is 'toxic' if inhaled and for that reason i use extreme caution and only mix in small amounts. I wonder now if the dark 

brown component of the refractory concrete i just got could be fly ash-? will get googling- a chemistry degree would come in handy some days.

On Thu, Dec 5, 2013 at 9:05 AM, <gobug@live.com> wrote:

 

There are 2 types of flyash C & F. I have played with both.

Toxicity? Everything has a toxicity, especially nothing. It is just a measure, like temperature. Water, air, lettuce, aspirin, radon..... everything has a toxicity number. 

"Fairly" is a word like "very". It is gut feel and has no quantification. Since flyash is the byproduct of burning coal for energy, the toxicity is not created by using it in a concrete or PC mix. I don't think concrete is more toxic because flyash is added, perhaps less because less Portland is used. The environmental impact of using flyash in the mix is less than using all Portland.

Type F flyash is a bit more expensive, more pozzolonic, and harder to find than Type C. My regular cement product supplier process their own type F. I believe it is Type F from Type C. This apparently removes some of the reputed contaminants in Type C. Type F is a dark gray not the light brown like type C, hence it gives a differently colored finished product. Type C is cheaper than Portland, Type F is about the same price as Portland. I do not know how Type F is processed. It could be that the energy required to process it makes the environmental impact the same as using Portland.

I have heard that road repairs in the cold weather areas use flyash because it lessens the risk of freeze cracking on freshly poured mixes. I notice more plasticity in the mixes I use.

Gary

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Re: [papercreters] Re: FLYASH..rice hulls/ash (RHA)

There are 2 types of flyash C & F. I have played with both.

Toxicity? Everything has a toxicity, especially nothing. It is just a measure, like temperature. Water, air, lettuce, aspirin, radon..... everything has a toxicity number. 

"Fairly" is a word like "very". It is gut feel and has no quantification. Since flyash is the byproduct of burning coal for energy, the toxicity is not created by using it in a concrete or PC mix. I don't think concrete is more toxic because flyash is added, perhaps less because less Portland is used. The environmental impact of using flyash in the mix is less than using all Portland.

Type F flyash is a bit more expensive, more pozzolonic, and harder to find than Type C. My regular cement product supplier process their own type F. I believe it is Type F from Type C. This apparently removes some of the reputed contaminants in Type C. Type F is a dark gray not the light brown like type C, hence it gives a differently colored finished product. Type C is cheaper than Portland, Type F is about the same price as Portland. I do not know how Type F is processed. It could be that the energy required to process it makes the environmental impact the same as using Portland.

I have heard that road repairs in the cold weather areas use flyash because it lessens the risk of freeze cracking on freshly poured mixes. I notice more plasticity in the mixes I use.

Gary

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