Propriedades mecânicas de argamassas com substituição de areia natural por escória de aciaria Baosteel’s Slag Short Flow (BSSF)

Abstract

The generation of waste has become an issue considered as one of the priorities in terms of environmental improvements, since the accumulation of various materials without the proper destination brings numerous environmental and social disorders. The low planning in the destination of by-products from the various industries is one of those responsible for the advancement of improper disposal. In addition, the increase in consumption in large urban centers causes the growth of industrial production and, consequently, an increase in the volume of various types of secondary materials, which do not have, a priori, an adequate destination. On the other hand, the civil construction sector suffers from a shortage of conventional materials for its industry, directing efforts to the substitution of conventional inputs by discarded materials that have technical and financial applicability conditions. In this sense, the present work aimed to evaluate the applicability of replacing the fine aggregate, sand, by Baosteel's Slag Short Flow (BSSF) by evaluating the hardened properties of mortars produced with levels of sand replacement by slag in volume. The experimental work consisted of slag characterization and characterization of the fresh state properties of mortars in mixtures 1:3, 1:5, 1:7 (cement:fine aggregate) and in mixtures 1:1:4, 1:1:6, 1:1:8 (cement:lime:fine aggregate). The substitution contents studied in this work were 0, 20, 40 and 60%. The tests showed the need for a greater amount of water to obtain a fixed spread of 260 ± 5 mm. Moreover, the substitution of sand by slag caused a considerable increase in the specific

mass in the hardened state, as well as an increase in the dynamic modulus of elasticity for both simple and mixed mortars. In relation to the compressive strength and flexural tensile strength, according to the analysis of variance, the substitution content had no significant influence on this property.