Specific mass and water absorption from concrete manufactured with alternate aggregates

Resumen

Concrete is the second most used material on the planet. Due to strong growth in emerging economies, there is an expectation of greater consumption of material in the coming years. Due to this growth, we can observe that the environment is being greatly damaged by the generation of waste. There are several sectors that generate these wastes, among them stands out the steel, the water treatment and the extraction of gravel as raw material for concrete producers. Therefore, this paper presents a study on the use of alternative solid waste as aggregates for the manufacturing of concrete. The residues used are: Water Treatment Station sludge (WTSS), Manufactured Sand and melt shop Slag. Therefore, concrete mixtures with total or partial substitution of the fractions of coarse aggregate (crushed) and fine aggregate (sand) were used. This substitution was made in mass. As a parameter of comparison we used a standard mix using 100% of the components in the concrete used in the region. The standard mix corresponds to a characteristic resistance to compression of 25 MPa and a water/cement ratio of 0,61. The concretes were analyzed for physical properties according to ABNT rules. The results of concrete tests made with artificial sand and melt shop slag were proved to be efficient material for structural applications. However, the concrete with the addition of WTSS can be used for non-structural use, such as filling element in projects that require low resistance to compression. This data was statistically analyzed by means of variance analysis ANOVA and the results indicate that with careful use, the waste studied here, may be alternative to the traditional use of aggregates for concrete manufacturing.