Rice Hull Ash — 9 Comments

  1. Hi!
    Very cool stuff. I am looking for a rice hull ash supplier, and I can only find international sources (mostly india). Where did you find your ash? Looking for a US, or at least North American supplier.

  2. Is it possible to make your own rice hull ash using a low tech oven, or do you need to use higher temperatures? Do you know of any current research being done on replacing cement with rice hull ash in the forming of CEB’s?

    • Search YouTube for how to make carbonized rice hulls. The videos show how to make the burners with recycled materials. But instead of just carbonizing them, you want to completely burn to ash. Carbonized hulls are for agricultural purposes. You want them completely burned for making building materials.

      I’m covering lots of related topics on my new Geopolymer House Blog:

      There are blog posts about bricks made with 100% fly ash. I imagine rice hull ash would also work. I’m pretty sure you’ll have to buy or rent a grinder to create fine powdered ash. The articles I’ve found don’t explain every detail, but they do give you a lot to go on.

  3. We are going to make some blocs tomorrow using clay and rice hull ash. thank you Owen for inspiring us in Nepal. We are also at the initial stage of experimenting with earthen countertops–don’t know how it goes, but will let you know once we have some results.

    • Add a little extra clay to compensate for the ash. The ash reduces the stickiness of the clay, so a little extra clay is needed for strong blocks. (Ours is too crumbly.)

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