Assessing the effectiveness of pozzolans in massive high-strength concrete |
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| Affiliation: | 1. Department of Civil Engineering, Université de Sherbrooke, 2500 Blvd. de l’Université, Sherbrooke, QC J1K 2R1, Canada;2. The Sonny Astani Department of Civil & Environmental Engineering, University of Southern California, Los Angeles, CA, United States;1. Railway Engineering Research Institute, China Academy of Railway Sciences, No. 2 Daliushu Road, Beijing 100081, China;2. State Key Laboratory of High Speed Railway Track Technology, No. 2 Daliushu Road, Beijing 100081, China;1. Süleyman Demirel University, Natural and Industrial Building Materials Application and Research Center, Isparta 32260, Turkey;2. Suleyman Demirel University, Technical Sciences Vocation School, Department of Construction, Isparta 32260, Turkey;3. Eski?ehir Osmangazi University, Faculty of Engineering and Architecture, Civil Engineering Department, Eski?ehir 26480, Turkey;4. Afyon Kocatepe University, Engineering Faculty, Civil Engineering Department, 03200 Afyonkarahisar, Turkey;1. Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran;2. Department of Engineering, Bu-Ali Sina University, Kaboodrahang, Hamedan, Iran |
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| Abstract: | This paper investigates the effects of supplementary cementitious materials on the temperature rising profile, heat evolution and early-age strength development of medium- and high-strength concrete. A total of 13 different mixtures were prepared, with two water–cement ratios (0.3 and 0.46). Natural pozzolan, fly ash, and silica fume were included in the specimens. The results showed that natural pozzolan, particularly fly ash served to decrease the amplitude of peak temperature, delay the occurrence of the peak, and decrease the sharpness of the temperature rising profiles. In contrast, the temperature profile of silica fume specimens was similar to those without silica fume. It was found that the best mixture, the highest early-age strength and the lowest heat liberation, corresponded to the specimen containing fly ash at 15% (be cement weight). This result justifies the advantage effect of fly ash which is able to develop sufficient tensile strength to resist thermal cracking potential in massive high-strength concrete. |
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