Investigation of Biomineralization on the Strength, Durability Properties of Fiber-Based RAC

In concrete, recycling waste materials plays a crucial role in preserving natural resources, managing construction and demolition waste (CDW) and reducing environmental impact. Given the extensive use of aggregates in concrete, integrating recycled aggregates can significantly enhance the sustainability of construction practices. This study investigates an innovative approach to improving the mechanical strength and durability of recycled aggregate concrete (RAC) through biomineralization and fiber reinforcement. The novelty of this research lies in the synergistic use of basalt fibers (BF), polyvinyl alcohol (PVA) fibers, and bacterial self-healing mechanisms to enhance RAC performance. Experimental results indicate that fiber-reinforced RAC exhibits superior compressive and splitting tensile strength compared to conventional RAC with 50% or 100% recycled aggregate. Among the fiber types, basalt fibers consistently outperformed PVA fibers in enhancing mechanical properties. This study provides a novel strategy for optimizing RAC performance, making it a more viable and sustainable alternative for construction applications.