Researchers find way to make nearly carbon-free rice husk ash for concrete. Mixing almost anything into concrete can make it more durable. A new way of processing rice husks for use in concrete could lead to a boom in green construction. Rice husks form small cases cases around edible kernels of rice and are rich in silicon dioxide (si02), an essential ingredients in concrete. Scientists have recognized the potential value of rice husks as a building material for decades, but past attempts to burn it produced an ash too contaminated with cardon to be useful as a cement substitute.
www.archicentral.com/rice-concrete-cuts-greenhouse-emissions-21776/