Recycle of large amount cathode ray tube funnel glass sand to mortar with supplementary cementitious materials

Abstract

Utilizing acid treated CRT funnel (T-CRTF) glass sand in mortar is a feasible option to lower natural resource consumption and protect the environment. In this study, T-CRTF glass sand replaces river sand in mortar at four levels (0, 25 %, 50 %, 75 %). The inclusion of T-CRTF glass sand improves the fluidity properties of mortar. At the initial curing period (3 days), T-CRTF glass sand mortar exhibits the larger hardened density, mechanical strength than river sand-based mortar. After all mortars cured in water for 90 days, the hardened densities and the mechanical strength of mortars with 25 %, 50 % T-CRTF glass sand are the slightly higher than control mortar. The use of the excessive T-CRTF glass sand can no increase anyway the long-term hardened density and mechanical strength of mortars. The recycle of T-CRTF glass sand to mortars reduces the water absorption, the chloride ion penetration, enhances the drying shrinkage, the alkali-silica reaction (ASR) expansion and the lead leaching amount. FA, GGBS mortars with 75 % T-CRTF glass sand have the lowest water absorption, chloride ion penetration in all mortars. The introduction of large amount T-CRTF glass sand to FA, GGBS mortars is more easily to induce the drying shrinkage, the ASR expansion and the long-term lead leaching from mortar. Considerations from the long- term mechanical strength, durability behaviors and environmental compatibility of mortar mixture, the application of 50 % T-CRTF glass sand in FA mortar is the sustainable method to dispose CRT funnel glass.