Influência do teor de substituição da areia por resíduo de reboco nas propriedades das argamassas

Abstract

Sand is one of the main components used in the production of mortars and concrete. The growing demand for sand has caused a worldwide shortage and, consequently, an increase in the sand cost, especially in urban centers. Moreover, the extraction of sand is associated with considerable environmental and social impact. In view of the fact, there is a growing demand for alternative materials that replace sand partially or totally. The present work analyzes how mortar’s properties are influenced when replacing sand with mortar residues generated during its application. Five types of mortars were tested with substitution contents of 0; 25; 50; 75 and 100% of the sand by the residue. The mix proportion adopted for the reference mortar was, in mass, 1:4.5:0.7 (cement, sand, water). The amount of cement and water remained the same across all studied mixes. The mortars were evaluated in fresh state and their physical properties determined at day 28. The results indicated that the waste had particles larger than the sand used. The replacement of sand by 100% plaster residue did not alter the properties of the mortar.