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Structural Engineering and Mechanics Volume 74, Number 6, June25 2020 , pages 747-756 DOI: https://doi.org/10.12989/sem.2020.74.6.747 |
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Temperature development and cracking characteristics of high strength concrete slab at early age |
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Chung-Hao Wu, Yu-Feng Lin, Shu-Ken Lin and Chung-Ho Huang
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| Abstract | ||
| High-strength concrete (HSC) generally is made with high amount of cement which may release large amount of hydration heat at early age. The hydration heat will increase the internal temperature of slab and may cause potential cracking. In this study, slab specimens with a dimension of 600 ✕ 600 ✕ 100 mm were cast with concrete incorporating silica fume for test. The thermistors were embedded in the slabs therein to investigate the interior temperature development. The test variables include water-to-binder ratio (0.25, 0.35, 0.40), the cement replacement ratio of silica fume (RSF; 5 %, 10 %, 15 %) and fly ash (RFA; 10 %, 20 %, 30 %). Test results show that reducing the W/B ratio of HSC will enhance the temperature of first heat peak by hydration. The increase of W/B decrease the appearance time of second heat peak, but increase the corresponding maximum temperature. Increase the RSF or decrease the RFA may decrease the appearance time of second heat peak and increase the maximum central temperature of slab. HSC slab with the range of W/B ratio of 0.25 to 0.40 may occur cracking within 4 hours after casting. Reducing W/B may lead to intensive cracking damage, such as more crack number, and larger crack width and length. | ||
| Key Words | ||
| high-strength concrete; silica fume; fly ash; temperature development; cracking | ||
| Address | ||
| Chung-Hao Wu: Department of Civil Engineering, Chung Yuan Christian University, No. 200 Chung Pei Road, Chung Li Dist., Taoyuan City 320, Taiwan Yu-Feng Lin: Department of Civil Engineering, Chienkuo Technology University, No.1, Chiehshou North Road, Changhua City 500, Taiwan Shu-Ken Lin: Department of Civil Engineering, National Chung Hsing University, No. 145 Xingda Rd., South Dist., Taichung City 402, Taiwan Chung-Ho Huang: Department of Civil Engineering, National Taipei University of Technology, No.1, Sec. 3, Zhongxiao E. Rd., Da\'an Dist.,Taipei City 106, Taiwan | ||