__._,_.___----- Original Message -----
You'll get lots of posts on this. The water/cement relationship in papercrete bears no relation to that in ferrocement or even regular cement. We're talking completely different solar systems, not just different planets.ElfN----- Original Message -----From: a.j. welmersSent: Saturday, October 13, 2007 4:49 AMSubject: [papercreters] QUANTITIES of WATER and CEMENT in PC [papercrete]In the discussions and recipes I am researching I do not see a lot of
information about the water that is used. Without any experience in
using PC, I know in my daily constructionwork with concrete that the
amount of water and the impurities in water are important factors for
the quality of the mix and I suppose that that also counts for PC.
Is there somebody in the PC community that can shed some light on this
topics?
How do you measure the amount of water in a mix
[eyeball / by volume / by weight / just guessing / ....]
When do you add water?
[start with water and add all the components / start with wetting the
paper and later add more water / have no particular following order / ...]
What water do you use?
[Drinking water / water from a pond / ....]
In the article Concrete Basics that you can find at
http://www.cement.org/basics/ concretebasics_ concretebasics. asp
I read=>
A properly designed concrete mixture will possess the desired
workability for the fresh concrete and the required durability and
strength for the hardened concrete. Typically, a mix is about 10 to 15
percent cement, 60 to 75 percent aggregate and 15 to 20 percent water.
The water-cement ratio is the weight of the mixing water divided by
the weight of the cement. High-quality concrete is produced by
lowering the water-cement ratio as much as possible without
sacrificing the workability of fresh concrete. Generally, using less
water produces a higher quality concrete provided the concrete is
properly placed, consolidated, and cured.
Excessive impurities in mixing water not only may affect setting time
and concrete strength, but also may cause efflorescence, staining,
corrosion of reinforcement, volume instability, and reduced
durability. Specifications usually set limits on chlorides, sulfates,
alkalis, and solids in mixing water unless tests can be performed to
determine the effect the impurity has on various properties.
Besides the water content it states=>
A continuous gradation of particle sizes is desirable for efficient
use of the paste.
=> Should we use other materials besides paper and sand with a bigger
particle size in a PC mix?
=> What would be usefull = light / strong / cheap / easy to get.
grtn
recipe researcher
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