Properties of concrete made with recycled crushed glass at elevated temperatures

The effect of replacement of fine and coarse aggregates with recycled glass on the fresh and hardened properties of Portland cement concrete at ambient and elevated temperatures is studied. Percentages of replacement of 0-100% of aggregates with fine waste glass (FWG), coarse waste glass (CWG), and fine and coarse waste glass (FCWG) were considered. Soda-lime glass used for bottles was washed and crushed to fine and coarse aggregate sizes for use in the concrete mixes. Samples were cured under 95% RH at room temperatures (20-22 degrees C), heated in the oven to the desired temperatures, allowed to cool to ambient temperatures, and then tested for their residual compressive strength. The compressive strength of the concrete samples made with waste glass was measured at temperatures up to 700 degrees C. Moreover, the effect of the percentages of replacement with recycled glass on the slump values and initial and final setting time of concrete has also been measured. The results of this study showed that the compressive strength of concrete made with RG decreases up to 20% of its original value with increasing temperatures up to 700 degrees C. In general, concretes made with 10% aggregates replacement with FWG, CWG and FCWG had better properties in the fresh and hardened states at ambient and high temperatures than those with larger replacement. Concretes made with FWG aggregates had higher compressive strengths than those made with CWG and FCWG at ambient and elevated temperatures. (c) 2005 Elsevier Ltd. All rights reserved.