Análise da influência da adição de polímeros superabsorventes e substituição de agregado convencional por resíduos de madeira em argamassas

Abstract

This study aims to investigate the partial replacement of sand with wood residues (RDM) in cement-based composites, seeking to mitigate the environmental impact resulting from the extraction of sand, a non-renewable resource. The introduction addresses the importance of sand in cementitious composites and the potential benefits of using RDM, such as improved lightness and thermoacoustic properties. However, a decrease in compressive strength and mix quality is also observed due to the increased water absorption by the residues. To address these issues, the methodology included a bibliometric analysis in the Scopus and Web of Science databases, aiming to identify relevant studies for future research. Based on this review, nine formulations of mortars were developed and evaluated, undergoing physical characterization tests and performance assessment in both fresh and hardened states. The results indicate that the incorporation of SAP and RDM impacted the properties of the mortars. A reduction in specific mass was noted with increasing addition and/or replacement. In the hardened state, all mixtures exhibited a decrease in compressive strength, with the exclusive addition of SAP resulting in lower losses compared to mixtures with RDM. Mixtures containing wood residues showed greater variation in strength, suggesting lower homogeneity, which was improved with the inclusion of SAP. The replacement of sand with RDM did not significantly compromise tensile strength; however, the combination of RDM and SAP resulted in decreases in these properties. In conclusion, the research demonstrates that the addition of SAP can mitigate some of the disadvantages associated with the use of RDM in mortars, contributing to the development of more sustainable and efficient building materials.