Study on characterization, mechanical, and thermal properties of Alfa fiber–reinforced compressed earth blocks incorporating crushed brick waste

Developing alternative eco-friendly construction materials is an important factor in sustainable development. Besides, one of the main ways to achieve this goal is the use of earthen materials in construction. In this respect, this study aims to investigate the feasibility of using Alfa fibers (Stipa tenacissima L.) and brick waste in the production of compressed earth blocks (CEB). Hence, the effects of Alfa fibers on the mechanical and thermal performance of CEB containing brick waste are analyzed. Brick waste content was fixed at 20% after an optimization study based on plasticity requirements, while Alfa fibers content varied from 0 to 0.5% of the dry weight of the block. Plain (unreinforced) CEB and fiber-reinforced CEB were tested for physical properties (density and absorption), compressive strength, and thermal behavior (conductivity and diffusivity). The results showed that Alfa fibers lightened the CEB. Also, adding Alfa fibers with a concentration of 0.5% increases the capillary absorption and the compressive strength by 40% and 111.25%, respectively. In terms of thermal properties, it is observed that using Alfa fibers improves the insulation aspect of the composite. Specifically, the thermal conductivity reduced by 13%. In all, using Alfa fibers and waste brick materials in CEB could be a promising solution to produce sustainable material with improved mechanical and thermal properties, contributing to the circular economy.