Resistência ao cisalhamento de prismas de alvenaria de solo-cimento com juntas finas de diferentes materiais

Abstract

In light of discussions about sustainability, especially in civil construction, the use of soil￾cement bricks stands out as a building material that generates less environmental impact. However, masonry made from these bricks often proves inadequate to withstand extreme lateral loads. Under such loading conditions, the shear strength of the masonry plays an important role. Thus, the main objective of this study was to investigate the impact of different bedding materials - adhesive mortar (AC), polymer mortar (AP), and acrylic adhesive (CA) - applied in thin layers, on the shear strength of masonry prisms constructed from soil-cement bricks. After characterizing the materials, prisms composed of three bricks were tested under shear stress while subjected to different levels of pre-compression. Using the Digital Image Correlation (DIC) technique, an analysis of the deformations and stress-strain relationship of the prisms was performed. In order to analyze the influence of the type of bedding material and pre￾compression on the mechanical behavior of the prisms, a statistical study was conducted using Analysis of Variance (ANOVA). Subsequently, shear strength parameters were determined according to the Mohr-Coulomb criterion. AP joints stood out for their high cohesion, guaranteeing superior resistance at low compressive stresses. In contrast, AC and CA joints presented high coefficients of friction, demonstrating a strong dependence on compression for strength gain. The study concluded that pre-compression distinctly influenced the shear strength of each type of joint, but not the shear modulus. The predominant failure mode occurred due to induced diagonal tension in the soil-cement bricks, confirming that the interface strength exceeded the strength of the masonry units. From the intermediate level of pre-compression, all types of joints converged to a statistically equivalent strength level, proving the structural viability of the three thin joint solutions in soil-cement masonry.