Mechanical properties of normal and high strength concretes subjected to high temperatures and using image analysis to detect bond deteriorations |
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| Affiliation: | 1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;2. Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China;3. China Construction Eighth Engineering Division, Corp. LTD Tianjin Branch, Tianjin 300450, China;1. Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Lyles School of Civil Engineering, Purdue University, 550 W Stadium Ave, West Lafayette, IN, 47907-2051, USA;1. Noshirvani University of Technology, Department of Civil Engineering, Babol, Iran;2. Civil Engineering Faculty, Graduate University of Advanced Technology, Haftbagh Exp. Way, Kerman, Iran;1. PLA University of Science and Technology, State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Nanjing, 210007, China;2. Army Officer Academy of PLA, The No.4 Department, Hefei, 230031, China |
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| Abstract: | The effect of high temperatures, up to 250 °C, on mechanical properties of normal and high strength concretes with and without silica fume was investigated, and image analysis was performed on split concrete surfaces to see the change in bond strength between aggregate and mortar. Specimens were heated up to elevated temperatures (50, 100, 150, 200, 250 °C) without loading and then the residual compressive and splitting tensile strength, as well as the static modulus of elasticity of the specimens were determined. For normal strength concrete residual mechanical properties started to decrease at 100 °C, while using silica fume reduced the losses at high temperatures. In terms of percent residual properties, high strength concrete specimens performed better than normal strength concrete specimens for all heating cycles. Image analysis studies on the split surfaces have been utilized to investigate the effect of high temperatures on the bond strength between aggregate and mortar. Image analysis results showed that reduced water–cement ratio and the use of silica fume improved the bond strength at room temperature, and created more stable bonding at elevated temperatures up to 250 °C. |
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