 This study examined the potential reuse of thermoset glass fiber reinforced polymer, GFRP, waste and concrete mixtures. It found that increasing the proportion of GFRP waste in concrete mixtures decreased the strength of both normal strength concrete, NSE, and controlled low strength materials, CLSM, but that adding 5% GFRP waste to CLSM resulted in a 7% increase in strength compared to concrete without GFRP. Additionally, the addition of superplasticizer allowed for the production of CLSM with sufficient workability to meet engineering standards. Furthermore, the use of recycled GFRP waste as a replacement for traditional aggregates in CLSM was found to be a more sustainable alternative to the current CLSM mixtures used in the market. This article was authored by Yufeng Li, Iwei Su, Jinyuan Su, and others.