A multi-criteria evaluation and optimization of sustainable fiber-reinforced concrete developed with nylon waste fibers and micro-silica

Abstract

Nylon waste bers (NWF) similar to new nylon bers possess high tensile strength and toughness, hence, they can be used as an eco-friendly discrete reinforcement in high-strength concrete (HSC). This study aimed to analyze the mechanical and permeability characteristics and life cycle impact of HSC with varying amounts of NWF and microsilica (MS). The results proved that NWF was highly bene cial to the tensile and exural strength of HSC. At the combined addition of 0.5% NWF and 7.5% MS, splitting-tensile and exural strength of HSC experienced net improvements of 49% and 55%, respectively. Lower doses of NWF were bene cial to the durability of HSC. However, 1% NWF was harmful to the durability of concrete. For the optimum mechanical performance of HSC, 0.5% NWF can be used with 7.5% MS. The use of MS also nulli ed the negative effect of the high volume of NWF on the penetration resistance of HSC.