Keywords: recycled glass, metakaolin, sustainability, physical properties, composite cements, concrete roof tiles, waste management, silica aggregate, ultrasonic pulse velocity, oxygen permeability, recycling, dry bulk density, compressive strength, modulus of elasticity, apparent porosity, sustainable development
Recycled glass as potential aggregate for concrete tiles: a statistical analysis of the physical and engineering properties
This paper investigates the use of washed post–consumer Recycled Glass (RG) as replacement of 7.5% and 15%#37; silica aggregate in concretes used to manufacture roof tiles. Three grading of RG were studied, defined by the retained particles on the following US Tyler mesh sieves: 4–10 (4.76–1.68 mm), 10–20 (1.68–0.84 mm) and 20–50 (0.84–0.30 mm). Metakaolin (MK) was used to replace 7.5% and 15% wt/wt Portland Cement (PC). The physical and engineering properties assessed were dry bulk density, compressive strength, modulus of elasticity, Ultrasonic Pulse Velocity (UPV), apparent porosity and oxygen permeability. The effect of particle size of RG, % RG and %MK on the physical and engineering properties was statistically studied using a full factorial design 33. Results showed that 7.5% RG in combination with 7.5% MK provided equivalent performance to reference semi–dry pre–cast concrete and, therefore, may be used as final route of disposal for RG.