Influência do resíduo de cerâmica vermelha em argamassas na substituição parcial do agregado ou do cimento.

Abstract

Life in society in this century is marked by the constant search for more sustainable forms of life, attitudes and products, given the eminent depletion of natural resources caused by intense development and unaware consumption, which endangers the survival of future generations. This problem concerns civil construction, once it is one of the major responsible for the extraction of natural resources, the emission of polluting gases and the generation of solid waste. The readjustment of the sector to new environmental and social requirements demands the reuse of waste, in order to dispose then properly, and also to reduce the consumption of new materials. Based on these needs, the main objective of this paper was to assess the red ceramic waste (RCW) from the construction materials manufacturing in the city of Pelotas (RS), as a potential substitute for Portland cement, considering the pozolanic activity of the material, and as a fine agreggate, taking advantage of its granulometry after processing. The replacemente was made in cement mortars (1:6) and mixed mortars (1:2:8), to allow the compression of the same RCW in different situations, so far non-existent. Substitutions were made in the contents of 5%, 10% and 15% to Portland cement, and also to the fine agreggate, in the contents of 10%, 15% and 20%. The mortars were evaluated in terms of mechanical performance (axial compression, and tensile flexion) and physical performance (capillary absorption and absorption by immersion and void indices). The results were very promising in indicating the feasibility of applying the material in both types of mortars. The RCW in mortars 1:6 provided mechanical improvements, especially in the contents of 5% and 15% substitution in the binder. In mixed mortars, the best physical performance of the mortar was highlighted with a 5% replacement in the binder. Traces with substitution in the aggregate were more impaired in relation to the substitution in cement. In addition, other traits, such as the 10% replacement in the aggregate and agglomerant, behaved in a very similar way to the reference mortars. With these results, it was possible to prove the viability of CVR in mixed mortars and cement.