The objective was to evaluate the influence of Baosteel slag short flow (BSSF) steel slag, a byproduct of a Brazilian steel mill, as a fine aggregate on the properties of fresh state and on the compressive strength of mortars. The experimental work was to characterize the BSSF steel slag and to produce simple mortars (only cement) and mixed mortars (cement and lime), replacing the natural sand with the slag aggregate in 20%, 40%, and 60% by volume. The fresh state tests were specific mass, incorporated air, water retention, and squeeze-flow, while in the hardened state, compressive strength at 28 days was investigated. It was verified that mortars with higher slag contents required greater amounts of water to obtain the spread (consistency) on the flow table, which was fixed at 260±5 mm. The mortars with slag presented higher specific mass since the slag had a higher density than natural sand and less water retention in the case of simple mortars. In addition, it was verified that the mortars with BSSF steel slag presented lower values of maximum displacement in the squeeze-flow test, which negatively affected its workability in the fresh state, besides the properties of mortar adherence. In addition, it was verified through the analysis of variance that the substitution of natural sand by BBSF steel slag did not significantly influence the compression strength of mortars.
O presente trabalho teve por objetivo avaliar a substituição do fíller calcário pela Cinza da Casca da Castanha de Caju (CCCC), nas porcentagens de 10%, 20% e 30% em volume na fabricação de Concretos Autoadensáveis (CAA). No estado fresco foram analisados o espalhamento, caixa-L, funil-V , densidade e teor de ar incorporado. No estado endurecido foi investigado a resistência a compressão aos 3, 7, 28 e 63 dias, ensaio de ultrassom e absorção de agua por capilaridade. Os resultados obtidos demonstraram que no estado fresco, à medida em que se aumenta a substituição de filler calcário por CCCC é necessário uma maior quantidade de aditivo superplastificante para manter as propriedades do CAA. No estado endurecido o teor de 30% de CCCC ficou próximo ao valor de referência, no entanto, esta resistência pode ser devido ao aumento do teor de aditivo superplastificante e não apenas à incorporação de CCCC. Alem disto, a variação do teor de substituição da CCCC não tem infuência na absorção por capilaridade.
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