Influência do teor de dreg em substituição à areia na demanda de àgua de argamassas

Abstract

Sand is one of the most used materials in the construction industry. The growing demand for this product has caused a worldwide shortage, especially in urban centers, in addition to generating environmental impacts during its acquisition. This has increased the search for alternative materials for the total or partial replacement of sand in the production of mortar and concrete. Thus, the objective of this work is the effect of the partial replacement of sand by dregs residue, generated during the production of cellulose, in mortars. Five types of mortar were used, with replacement contents of 0; 5; 10; 20; and 30% of the sand for the residue. The mix adopted for the reference mortar was 1: 0.5: 4.5: 0.7 (cement: limestone filler: sand: water) and superplasticizer additive in a content equal to 0.35% to the fine mass (cement and limestone). In order to maintain a pre-established consistency index, the water content of the mortar was variable. The mortars were evaluated in their fresh state and physical properties determined at 28 days. The results indicated an increase in the water content as a function of the amount of waste used, consequently, negatively impacting the mechanical properties.