Post-fire residual mechanical properties of concrete made with recycled rubber aggregate |
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| Affiliation: | 1. Department of Civil Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA;2. Department of Civil and Environmental Engineering, The University of Louisville, Louisville, KY 40292, USA;1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, China;2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, China;1. Department of Civil Engineering, College of Technology and Engineering, MPUAT, Udaipur, India;2. Department of Civil Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, India |
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| Abstract: | This study investigates the effects of elevated temperatures on the residual mechanical performance of concrete produced with recycled rubber aggregate (RRA). Four different concrete compositions were prepared: a reference concrete (RC) made with natural coarse aggregate and three concrete mixes with replacement rates of 5%, 10% and 15% of natural fine and coarse aggregate by RRA from used tyres. Specimens were exposed for a period of 1 h to temperatures of 400 °C, 600 °C and 800 °C, after being heated in accordance with ISO 834 time–temperature curve. After cooling down to ambient temperature, the compressive strength and the splitting tensile strength were evaluated and compared with reference values obtained prior to fire exposure. For the replacement rates used in the present experiments, the obtained results show that concrete made with recycled rubber aggregate (CRRA) present a thermal response that is roughly similar to that of RC; in addition, although residual mechanical properties of CRRA are noticeably more affected than those of RC, particularly for higher exposure temperatures, the relative reduction should not prevent it from being used in structural applications. |
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