Paving Block Mortars Made with Mixed Waste Glass from Municipality

To reduce the negative environmental impacts of waste glass, this research aims to incorporate mixed types of municipal waste glass in cement block mortars. The waste glass was first crushed, milled and screened with #18 and #20 meshed sieves to obtain the waste glass powder (WGP). The WGP, grouped into 3 sizes; smaller (P#20WGP; 95% finer than 125 μm) and larger than #20 mesh-sieve (T#20WGP), as well as an equal mix of both sizes (M#20WGP), was used to replace sand in 0-100% ranges. The specific strength of mortars was enhanced by increasing the WGP contents. X-ray diffraction analysis suggested that carbonation at the early age observed in the P#20WGP-mortars could accelerate strength development. The extended working time test showed that the fresh WGP-mortars had the potential for casting in the first 120 min. The hand ramming method of the mortars using different amounts of WGP did not show a significant difference in mechanical properties suggesting that WGP could replace sand at all percentages. The surface temperature change, as a function of solar irradiated time, of both mortar blocks was similar.