Effects of the addition of red ceramic, limestone filler and rice husk ash in alkali silica reaction
Published on Dec 1, 2018
· DOI :10.1007/S41024-017-0030-0
Studies about the reactive potentiality of the Red Ceramic Waste (RCW) and of the rice husk ash (RHA) and their use in the composition of Portland cement, avoiding inadequate disposal, is a theme of strong relevance for the environmental sustainability of the productive chain of a country. Analysis of the feasibility of incorporating RCW and RHA to Portland cement demands studies involving the effects on compressive strength and, overall, about the performance of the hydrated matrix when susceptible to the action of deleterious physical–chemical interactions. This work has the objective of evaluating the influence of incorporating milled RCW and RHA in the composition of Portland cement over the resistance to the occurrence of the alkali silica reaction (ASR), based on Brazilian Standards. In order to that, mortar of CPV-ARI cement (reference) and compositions with substitution of 10% of cement in weight, by limestone filler, RHA or RCW, with three different finenesses, were evaluated regarding ASR, according to the Brazilian Standards. Results evidence that RCW and RHA caused increase in ASR expansion. On the other hand, the greater fineness of RCW impacts, positively, the behavior of the material in face of degradation. Limestone filler did not influence the result of expansion by RCW. Regarding RAS, it is important to increment the comminution of the grounded RCW by 1.5 h in order to approximate its particle size distribution to the distribution of cement, which as a tendency of potentiating the mitigating capacity of this mineral addition.