Mechanical and rheological properties of High-Performance concrete (HPC) incorporating waste glass as cementitious material and fine aggregate

The disposal of waste glass was a huge challenge for the sustainable development of the city. Its usage in HighPerformance concrete (HPC) was a perspective way to improve the working and mechanical properties. In this paper, waste glass powder (WGP) and waste glass sands (WGS) were introduced in the HPC and used to partly replace cement and river sands, respectively. The individual effects of WGP or WGS on flowability, rheology, thixotropy, alkali-silica reaction, mechanical properties, and microstructure were investigated. Furthermore, the central composite face-centered design (CCF) method was adopted to assess the synergistic effect of the mixtures blending combined WGP and WGS on rheological and mechanical properties. The results showed that the workability, thixotropy, and mechanical properties of HPC with WGP incorporation were improved, while the addition of WGS had a negative effect on mechanical properties. Meanwhile, no obvious expansion hazard was observed after ASR testing in the presence of WGP or WGS. 20% WGP (20% binder weight) and 10% WGS (by aggregate weight) exhibited better synergistic effect on the properties of HPC, especially the highest comprehensive evaluation result score alphaP20S10 of 3.24 was obtained under this replacement, exhibiting optimal utilization waste glass in HPC.