Utilization of waste glass powder as partial replacement of cement for the cementitious grouts with superplasticizer and viscosity modifying agent binary mixtures: Rheological and mechanical performances

The utilization of waste glass in cement-based grouting materials has attracted a lot of interests due to its ability of improving rheological properties and stability. The purport of this research was to investigate the feasibility of the grouts containing waste glass powder (WGP), superplasticizer (SP), and viscosity modifying agent (VMA). For all testing mixtures, the water to binder ratio was maintained at 0.5. The selected mixtures were used to evaluate properties of mini-slump, marsh cone flow time, thixotropy, bleeding capability, autogenous shrinkage, compressive strength, and flexural strength. The statistical analysis method was adopted to further assess the synergistic effect of WGP, SP, and VMA. The testing results indicated that the use of 15% WGP as cement replacement improved the mini-slump diameter, and marsh cone flow time, in the meantime, decreased yield stress and plastic viscosity. Moreover bleeding capacity and mechanical properties were enhanced simultaneously. The method of Decision Matrix Analysis (DMA) was carried out to comprehensively evaluate and analyze the effect of each component in the grouts, and the results shown that WGP had notably positive effects on the properties of grouts.