[papercreters] Re: Papercrete research in South Korea

Sorry. Yahoo chopped up that url link.

Here is the same link to the South Korean papercrete research report in a clickable TinyUrl format.

http://tinyurl.com/SourthKoreanPapercreteResearch

--- In papercreters@yahoogroups.com, "JayH" <slurryguy@...> wrote:
>
> Not only is papercrete research being conducted in Korea, but the Korean government is paying grant money to researchers to make it happen.
>
> http://www.iccm-central.org/Proceedings/ICCM18proceedings/data/2.%20Oral%20Presentation/Aug23(Tuesday)/T15%20Green%20Composites/T15-3-IK0961.pdf
>
>
> Their process for making papercrete paralleled the type of thinking engineers use for testing concrete. They intentionally kept their samples moist for 7 days before pulling the forms off. That is the type of thinking used when making concrete.
>
> They then let their samples dry for 60 days after casting, which would be 53 days after the forms were pulled and the samples were removed from a moist environment. For the dimension of the samples they made, this should have been more than enough time for them to completely dry, but they make no mention of the environmental conditions during the drying time.
>
> They make no mention of compressing the slurry into the forms, which is one of the most important factors in determining final strength of the dry sample.
>
>
>
> I'm very disappointed in their mix ratios. They used an extremely cement-rich mix. They had some samples use as much as 1 part paper to 19 parts cement!! Seriously! That is the highest cement ratio I have ever seen. Unreal. I tend to wonder if this could even be called papercrete and keep a straight face. It's concrete with a tiny bit of paper fiber tossed in.
>
>
> The least amount of cement they used had 1 part paper to 5.7 parts cement by weight. This is still extreme overkill. In fact, most of the best attributes of papercrete won't be apparent at those mix ratios.
>
> I would classify their experiments more in the fibercement category. Something along the lines of what is used to make fibercement siding or Hardiboard.
>
>
> Their conclusions seem on par with what most of us would have expected. The more paper, the more shrinkage. The strength numbers go down.
>
> The sad part is they didn't get to low enough cement ratios to start to see the real advantages that papercrete has to offer, such as insulation and low cost.
>
>
> I'm glad to see this research being conducted, but clearly too many researchers are thinking along the lines of papercrete being concrete and not thinking of papercrete as a composite wood product. Even with these limitations, there is some worthwhile data in their report.
>
> I hope to see more research conducted. I don't really care in what country.
> The more information available the better.
>




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