This paper aims to experimentally study the impact of waste glass powder (GP) as a partial cement replacement (up to 20%) with two different particle size distributions ((55 µm < GP-A < 135 µm) and (55 µm > GP-B)) on the compressive strength and Modulus of Elasticity (MOE) of concrete. The concrete mixes for GP-A considered in this study have water to binder ratio (w/b) of 0.49 and 0.57, whereas only a w/b ratio of 0.57 was considered for GP-B mixes. The experimental data obtained were used to develop different models to predict the elastic modulus of GP-modified concrete. The test results showed that the compressive strength and the MOE decreased with the increase of GP content. The size effect of GP as compared to w/b and GP content on compressive and MOE was relatively small. A nearly similar failure behaviour and peak strain were observed for all concrete mixes. The stiffness of the concrete decreases comparatively with an increase in the GP replacement level. Finally, the proposed MOE equations provide better predictions than the empirical models and practice codes considered in this study. They can be used in calculating the elastic modulus of GP-modified concrete.

In this paper, a comprehensive experimental investigation was conducted into the effect of the particle size distributions (PSDs) and percentages of waste powdered glass as a partial replacement of cement on the long-term mechanical behavior of concrete produced at two different cement levels. For this purpose, two different mixtures of concrete were used as reference mixtures; the first has a relatively low cement content (331 kg/m ³ ), and the second has a relatively high cement content (490 kg/m ³ ). Two different PSDs of glass powder (GP) labeled GP-A and GP-B ((55 µm< GP-A < 135 µm) and (55 µm> GP-B) were used, and the considered GP content for the low cement content mixture (LCCM) and the high cement content mixture (HCCM) were (0%, 5%, and 10%) and (0%, 5%, 10%, and 15%) by weight of cement, respectively. The mechanical performance of all concrete mixtures at 180 days was investigated and evaluated in related tests as compressive strength and toughness, splitting and flexural tensile strength, elastic modulus, and compressive stress-strain behavior. The experimental results generally indicated that the compressive strength of GP-modified concrete improved significantly over the long-term age (180-days) compared to the early age (28-days). The contribution of PSDs of GP to enhancing the mechanical properties of concrete is insignificant compared to its replacement amount. Finally, independent of the PSDs, the incorporation of 10% GP for LCCM and 15% of GP for HCCM has a positive effect on the long-term mechanical properties of concrete, indicating that GP can be used as a replacement for cement.