Aproveitamento de resíduos de construção e demolição na confecção de argamassas com potencial sustentável

Abstract

Given the need to promote environmentally responsible practices, the reuse of construction and demolition waste has been increasingly studied as a way to reduce the environmental impacts of the construction industry. In this context, this study aims to evaluate the compressive strength of mortars produced with different proportions of recycled sand, in order to assess their technical feasibility from the perspective of mechanical strength for various applications. The methodology involved collecting recycled sand from a processing plant, selecting and characterizing the materials, designing mortar mixes, molding 12 test specimens, and conducting compression tests. At 7 days of age, mortars with 50% recycled sand showed a characteristic strength close to 10 MPa, with performance further improved when a superplasticizer additive was used. The results indicate that the use of recycled sand is a technically feasible alternative, not only from an environmental standpoint but also in terms of meeting the strength requirements for mortars used in block laying, wall gap filling, and subfloor applications. It is concluded that the incorporation of recycled sand into mortars represents a sustainable and efficient solution, capable of reducing natural resource consumption and contributing to the better management of construction waste.