Concrete with recycled glass as fine aggregates

Abstract

Recycled waste glasses were used as sand replacement in concrete at 0, 25, 50, 75, and 100% replacement ratios. Diverse concrete properties were tested in fresh and hardened states with three concrete grades; that is, with compressive strengths of 30, 45, and 60 MPa (4350, 6525, and 8700 psi). The incorporation of glass sand showed no significant influence on fresh or mechanical properties of concrete. Drying shrinkage was reduced due to the negligible water absorption of glass sand, especially at lower water-cement ratios (w/c). Resistance to chloride ion penetration was substantially enhanced because of the improved and densified microstructure at the interface transition zone (ITZ). Based on alkali-silica reaction (ASR) tests up to 49 days, cement mortar containing glass sand was found to exhibit innocuous expansion. Use of mineral admixtures, such as fly ash and slag cement, could further improve the durability of concrete containing waste glass particles. © Copyright 2014, American Concrete Institute. All rights reserved.