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DAFICO, D. A. et al. Method to obtain gray color rice husk ash from black color rice husk ash. In: CIB SYMPOSIUM ON CONSTRUCTION E ENVIRONMENT: THEORY INTO PRACTICE, 2000, São Paulo. Anais… São Paulo, 2000.
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Abstract

It is well know that Rice Husk Ash (RHA) produced by controlled combustion, specially in fluidized-bed furnaces, has very good pozzolanic activity. Despite of RHA to be one of the largest agricultural waste in world, this material is not really being used as cement or concrete addition, mainly because of the strong black color of the concrete that is produced with this pozzolan. This paper describes a method to reduce the carbon content of black RHA produced by fluidized-bed furnaces, so producing a Gray Color RHA, without changing the pozzolanic activity.
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