Comportamento mecânico de alvenaria confeccionada com tijolos modulares de solo-cimento-RCD

Abstract

The application of recycled sand from construction and demolition waste (CDW) in the soil-cement mixture for the manufacture of modular bricks for structural masonry was investigated, evaluating bricks and prisms. Firstly, the optimum moisture content was analyzed by analyzing the additions of CDW with 20%, 40%, 50% and 60%, by mass, in the soil mixture with 10% cement. The bricks were evaluated for their geometric characteristics, compressive strength, density and water absorption. The compressive strength of the bricks was analyzed at different ages (7, 14, 28, 56 and 530 days). The prisms (250.75mm x 126.41 mm x 137.16 mm), with a conventional 5 mm mortar joint, were evaluated for compressive strength, modulus of elasticity and failure mode, aged 530 days. The results demonstrated the feasibility of using CDW, which increases the compressive strength of the bricks, but makes molding difficult, as it reduces initial cohesion. The efficiency factor of the prisms was 57%. The failure mode observed was tension in the bricks and subsequent propagation of cracks in the joints - behavior similar to materials with brittle rupture. Brazilian standards approached the mechanical behavior of the material.