Advancements in Circular Economy for Construction: Mechanical and Thermal Performance of Bricks Incorporating bio-based Pore-Forming Agents

Abstract

Abstract This study proposes an innovative approach to using marine biomass as a pore-forming agent in the manufacture of fired bricks, as part of a sustainable construction approach. Two distinct granulometry of biomass, were incorporated at a ratio of 6% by weight into the clay matrix. The physical, mechanical, and thermal properties of the samples were evaluated through a combination of experimental methods and numerical simulations using ANSYS Fluent. The findings indicate that the incorporation of biomass results in a decrease in bulk density (-13.2%), an augmentation in porosity (+91.8%), and a substantial enhancement in thermal insulation, as evidenced by a reduction in thermal conductivity to 0.4 W/m.K. These findings were corroborated by numerical analyses, which demonstrated an attenuation of thermal peaks and a reduction in the thermal decrement factor to 23%. However, these thermal gains were accompanied by a reduction in compressive strength (-50.39%). These results underscore the promise of marine biomasses in the development of eco-friendly building materials, while underscoring the necessity of achieving a balance between thermal and mechanical performance to ensure their viability in specific applications.