Life cycle assessment of mortar with recycled brick dust and enhancement of mechanical performance by incorporating nylon fiber

Abstract

Recycling brick dust from demolished structures promotes waste management but requires strength and environmental impact assessments. Incorporating fibers into the mortar with recycled dust offers a novel solution to enhance mechanical properties compared to conventional mortar. This research investigates the environmental impacts and mechanical enhancement of cement mortar by incorporating recycled brick dust and nylon fibers, derived from waste ropes. Utilizing four volume fractions of nylon fibers (0.1, 0.2, 0.35, 0.5%), the study assesses the impact on compressive strength, flexural strength, and toughness, alongside environmental and cost benefits compared to traditional materials. Results from the study indicate that the optimal nylon fiber content of 0.2 volume fraction significantly improves compressive and flexural strengths. Approximately, 75% enhancement of flexural toughness was found for 0.35% volume fraction. Scanning electron microscopy analysis reveals enhanced bonding and reduced crack formation. Life cycle analysis confirms the environmental benefits of recycled brick dust over river sand, highlighting its role in promoting sustainability in the concrete industry without compromising performance. Approximately, 20% reduction in the environmental impact is possible using brick dust instead of river sand as fine aggregate. This approach addresses waste management challenges and offers a cost-effective, environmentally friendly alternative to conventional mortar materials.