Effect of using glass powder as cement replacement on rheological and mechanical properties of cement paste

Glass powder (GP) is considered as a pozzolanic material, thus it can be used as a partial cement replacement material. Its effect on the microstructure and on the mechanical properties is controlled by its chemical composition, particle size distribution (PSD), the amount of replacement and the curing conditions. The effect of cement replacement by glass powder on the rheological and the mechanical properties of cement paste is studied. Two types of cements were used (CEMI and CEMII) at five different percentages of glass powder replacement (0, 10, 20, 25 and 30%). The results showed an increase in the cement paste flow using CEMI compared to CEMII. Also, the initial and final setting times were lower at CEMI than CEMII. Increasing the replacement percentages by higher glass powder resulted in a decrease in the linear and volume expansion of the mixes due to the reduction of the ASR. The 10 and 20% GP mixes showed a higher compressive strength at longer ages than the control mix which is related to the pozzolanic reactivity of the glass powder. Bottom Ash was added to the 20% GP mix, at different percentages (2.5, 5, 10 and 20%). The maximum compressive strength was obtained at 5% BA mix. (C) 2018 Elsevier Ltd. All rights reserved.