Análise das propriedades mecânicas da argamassa para revestimento composta por blends de água cinza

Abstract

The actions practiced by the civil construction sector generate several damages to the environment, both in relation to the consumption of natural resources for the production of its inputs, and with the generation of waste. Of all the natural resources, clean drinking water is essential for the maintenance of life. Factors such as excessive demand, waste, and pollution contribute significantly to the intensification of the scarcity of this resource. In the construction industry, the scenario is no different; water is used on a construction site to carry out most of the activities. The objective of this work is to analyze the physical and mechanical characteristics of mortar coating composed by blends of gray water in the proportions of 25%, 50%, 100% and in the proportion of 100% for water provided by the utility company (reference water). The gray water used in the experiment was collected from a washing machine and its physical-chemical analysis was initiated between 6 and 24 hours. To verify the mechanical properties, prismatic specimens were molded and used for flexural tensile strength and axial compression tests. The chlorides, the hardness and the biochemical oxygen demand for the gray water were analyzed within the standards allowed by CONAMA 357/05 and portaria MS 518/04. The alkalinity values found were outside the index required by CONAMA 357/05, but within the established by the ordinance MS 518/04. The mechanical results, at 28 days, performed for the samples showed that the blends of 25% and 50% gray water, obtained greater strength when compared to the mortar containing 100% ash water. However, the percentage will depend on the water quality, cost reduction desired by the work and pathological studies of the mortar.