Abstract
Twenty concrete mixtures (300 concrete cylinders) were cast to investigate the properties of green concrete incorporating recycled glass. The mixtures had water-to-cement ratio of 0.46, recycled glass percentage partial replacements of natural sand of 0%, 15%, 30%, or 50% by weight, and different proportional weight ratios of coarse aggregates of 1.0%, 1.5%, 2.0%, 2.5%, or 3.0%. Concrete cylinders were cured at different curing periods of 7 days, 28 days, or 52 days. The mechanical strength (compressive, splitting, and ultrasonic) tests were utilized to evaluate concrete mixtures. The results found that extending curing period for majority of concrete mixtures from 7 days to 28 days showed a statically significant increase in the compressive strength. Whereas, extending curing period beyond 28 days up to 52 days did not have a clear impact on the compressive strength. In case of using recycled glass in a concrete mixture, the proportional weight ratio of coarse aggregate should be reduced to maintain the value of compressive strength. Up to 50% recycled glass can used to produce green concrete with high compressive strength.