Ceniza de cáscara de arroz como sustituto parcial del cemento portland en la elaboración de morteros cementicios de edificación

Abstract

Abstract: Research on the partial substitution of cement and its benefits have been carried out frequently during the last few years; the use of agricultural residues has shown a favorable way to reduce environmental pollution. In the present thesis, the partial substitution of cement with rice husk ashes was analyzed and experimented through two procedures for its activation, the first one is the alkaline activation, mixing the ashes with sodium hydroxide [Na(OH)] and potassium hydroxide [K(OH)]; the second method is by thermal activation at 500 ºC for two hours. Different tests were carried out to analyze the cementitious properties of rice husk ash (RHA). Finally, specimens were made by adding the pozzolanic cementitious supplements; they were analyzed with mechanical compression tests and physical tests of density and porosity, water absorption by immersion, water absorption by capillarity and pH of the pore solution. It was found that the specimens with the addition of potassium hydroxide had greater improvements compared to the other specimens and especially to the control specimens.