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  1. markmc

    any geopolymer -flyash-concrete in USA yet?

    I think the waste stream is too complex to guess. Off hand, I think it could be used as the water source. Although, you will have to make more than a few bricks to use all of that waste stream. As far as the boron and selenium leaching, there is a lot of research and experimental data on the...
  2. markmc

    any geopolymer -flyash-concrete in USA yet?

    I can vouch for several of the properties you mention, especially b, the stuff is really "sticky" and will bond well with a broad range of other materials. The applications that you mention are ones that I am interested in looking into. The fun part is that it's all new. My recipes are as good...
  3. markmc

    any geopolymer -flyash-concrete in USA yet?

    I have followed the development of materials known as geopolymers for a few years now. I have created various formulae for GP mixes after I saw a sample about ten years ago. It has some unusual properties that could be useful in many different fields. But... So far, the commercialization has...
  4. markmc

    Lead-acid battery desulfating

    I would like opinions on equipment designed to desulfate lead-acid batteries. I have read as much as I can find on the subject. There are a few companies that manufacture charger/desulfaters. The claim is that by applying a pulsed signal (1 Khz?) range, the formation of sulfate crystals which...
  5. markmc

    Modeling Coefficient of Drag

    I am an ME, and I haven't attempted to model airflow since college. I have a design problem that involves a small automotive trailer. I am looking for recommendations on a relatively simple piece of software to model airflow. I do not need a high degree of accuracy, rather, I would like to...

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