Ceniza de cascarilla de arroz como fuente de sílice en sistemas cementicios de ceniza volante y escoria activados alcalinamente

摘要

[EN]This study assesses the viability of using an agro-industrial\udby-product, rice husk ash (RHA) from a Colombian rice\udcompany’s combustion facility, as a total replacement for\udthe commercial sodium silicate ordinarily used in alkaliactivated\udbinders. Fly ash (FA), granulated blast furnace\udslag (GBFS) and binary 50FA:50GBFS blended pastes\udwere activated with a mix of sodium hydroxide and either\udsodium silicate or one of two types of RHA. The pastes\udwere characterised for strength, mineralogy and microstructure.\udThe findings showed that the agro-industrial\udby-product can be used to yield alkali-activated materials\udwith 7‑day mechanical strengths on the order of 42 MPa.\udThe study confirmed that both amorphous silica and part\udof the crystalline silica present in RHA participate in the\udalkaline activation process, providing the alkalinity is suitably\udadjusted.