Efeito da adição de solo nas propriedades mecânicas e termo-hígricas do bioconcreto de bambu

Abstract

Bioconcretes are composites produced from bio-based aggregates and a hydraulic or nonhydraulic binder. When this binder is cement, the conventionally produced bioconcretes present a challenge regarding their environmental impact, due to the high consumption of cement. Aiming to obtain a more sustainable material, which would also be able to promote hygrothermal comfort for indoor environments, this study proposes to partially substitute the cementitious matrix by soil, in bioconcretes with bamboo particles as aggregates. In this work, the influence of the matrix replacement by 10%, 15% and 20% of soil on the mechanical, hygrothermal and environmental properties of bioconcretes containing 35%, 40% and 45% of bamboo was investigated. For this purpose, studies of hydration, compressive and flexural strength, physical and hygrothermal tests, and the life cycle assessment of the material. It was observed that the soil acted as a filler, accelerating hydration through both nucleation and dilution effects. The highest mechanical strengths were observed in the reference mixtures, for the bamboo volume fraction of 35%, and the mixtures with 10% and 15% soil content, for the volume fraction of 45%. The incorporation of soil allowed the bioconcrete to exchange more moisture with the environment, and increased water vapor permeability. In environmental aspects, the use of soil made it possible to reduce the consumption of cementitious materials and, consequently, the carbon footprint