Properties of mortar and pervious concrete with co-utilization of coal fly ash and waste glass powder as partial cement replacements

Abstract

Cement mortar mix was optimized with coal fly ash (FA) and milled waste glass powder (GP) for the targeted flow percentage (F%) at 110% and a maximum possible 28-day compressive strength (C28). Then, pervious concrete was produced with the optimum mortar mix and tested for the permeability, compressive strength and mass loss. The results showed that the flow at 109.7% and the maximum 28-day compressive strength at 82.6 MPa were achieved with a mortar mix of FA/binder at 14.3%, GP/binder at 7.3% and water/binder at 30%. According to the prediction models, the ratios of FA/binder and GP/binder had a statistical significance on the F% and the C28, respectively. The 28-day hardened pervious concrete made of the optimized mortar mix had a permeability of 6.3 mm/s, a compressive strength of 15.2 MPa, and a mass loss of 44.8%. The co-utilization of FA and GP enhanced the rate and extent of compressive strength development for both mortar and pervious concrete. This study demonstrates that a sustainable production of green infrastructure pervious concrete is feasible with co-utilization of waste materials, FA and GP, as the partial cement replacements.