Evaluation of Rice Straw Ash as a Pozzolanic Addition in Cementitious Mixtures

Rice husk ash is one of the most widely studied biomass ashes used in pozzolanic addition. Given its lower silica content, rice straw (RSA) has been explored less often, despite fact that, according to United Nations Food and Agriculture Organization (FAO), (RS) production estimated at 600 million tons/year. In this work, RSA was physically chemically characterized, properties were assessed. A controlled conditioning, burning, homogenization grinding procedure carried out obtain from RS. Chemical composition, insoluble residue, reactive silica, chloride content particle size distribution assessed for characterization. To determine pozzolanicity, Frattini, electrical conductivity pH measurements an aqueous suspension hydrated CH/RSA mixtures obtained. Portland cement (PC) mortars with 15% 30% substitutions evaluated. The mechanical tests showed specimens a strength activity index up 90% 80% RSA, respectively, after 3 days, these values grew 107–109% 90 curing days.