Effect of high temperature and cooling regimes on the compressive strength and pore properties of high performance concrete |
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| Affiliation: | 1. Wong & Cheng Consulting Engineers Ltd., 608 Bank Centre, 636 Nathan Road, Kowloon, Hong Kong;2. Southeast University, Nanjing 210096, PR China;1. Department of Civil Engineering, Nigde University, 51240 Nigde, Turkey;2. Department of Geology Engineering, Nigde University, 51240 Nigde, Turkey;3. Department of Civil Engineering, Erciyes University, 38039 Kayseri, Turkey;1. Department of Civil Engineering, Rasht Branch, Islamic Azad University, Rasht, Iran;2. Department of Civil Engineering, Deylaman Institute of Higher Education, Iran;3. Department of Civil Engineering, Andishmand Institute of Higher Education, Iran;1. Department of Civil Engineering, School of Mechanics and Engineering Science, Shanghai University, Shanghai, 200444, China;2. School of Architectural Engineering, Yangzhou Polytechnic Institute, Yangzhou, 225127, China;1. Department of Civil Engineering, Nazarbayev University, Astana 010000, Republic of Kazakhstan;2. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China;3. NUST Institute of Civil Engineering (NICE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), Sector H-12, Islamabad 44000, Pakistan |
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| Abstract: | This paper describes the behavior of high performance concrete (HPC), compared with normal strength concrete (NSC), after subject to different high temperatures (800 and 1100°C) and cooling regimes (gradual and rapid cooling). Deterioration of compressive strength of the concrete was measured. The results obtained showed that the strength of both the HPC and NSC reduced sharply after their exposure to high temperatures. Thermal shock due to rapid cooling caused a bit more deterioration in strength than in the case of gradual cooling without thermal shock. However, thermal shock did not significantly increase the spalling of HPC. Mercury intrusion porosimetry (MIP) tests were carried out to measure changes in the pore size distribution in the concrete. Test results showed that the pore volume in the HPC increased much more than that in the NSC. A significant change in the cumulative pore volume was observed and the difference in cumulative pore volume between the two cooling regimes was less after subject to the peak temperature of 1100°C when compared with that of 800°C peak temperature. |
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