Influência da adição da cal hidratada e pigmento em microconcretos coloridos

Abstract

The innovation in the construction industry regarding concrete performance and its architectural influence is noteble. Hence the importance of scientific studies based on new compositions. In this study, high-strength colored microconcretes were produced using two types of Portland cement, incorporating hydrated lime (CH I) into the mixture. A reference mix without pigment and without lime (dosed with Type V Portland cement - CP V and white structural Portland cement - CP B) was adopted, as well as other mixes, one for each type of cement, with pigment added and others with pigment and lime added. For the mixes dosed with pigment and lime, a pigment content of 5% and a lime content of 15%, both in relation to the cement mass, were added. The influence of both pigment and lime on compressive strength and coloration was verified at 28 days of age. The microconcrete consistency was analyzed through the flow table test (NBR 13276, 2002). The analysis showed that the microconcrete produced with CP B had more intense colors. Regarding axial compressive strength, the best performance was observed in pigmented concretes, with the best result obtained for the concrete with CP B cement and pigment, showing an increase of 31,67% compared to the standard microconcrete. Regarding consistency, a greater slump was observed in the concretes produced without lime in the mix.