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| Experimental Research on Hydration Temperature of Concrete Box Girder |
| FENG De-fei, LU Wen-Bang |
| Beijing Jiaotong University Beijing 100044, China |
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Abstract Research purposes: Temperature stress was regarded as one of the major reasons of cracking of concrete box girder. For providing design and engineering of box girder with beneficial references, the main purposes of temperature test of hydration are to grasp the regularities of distribution of hydration temperature follow box girder section and under considering the state of arts of concrete construction，we estimate temperature stress.
Research methods: The tests are carried out on mid-span and tip sections of box girder. With the principle of disclosing adequately the developmental rules of hydration of box girder, temperature probes covered in concrete are arranged at top tray, soleplate and web. Then the variation of hydration temperature would be measured after concrete placement.
Research results: With the results of temperature tests, time-temperature curves of hydration could be drawn. According to the test results of hydration temperature of Qinhuangdao-Shenyang Passenger Dedicated Railway Line concrete box girder, the general and developmental rules of concrete hydration temperature in earlier phase are discussed, including the commonly form of travel time curve, the basic rules of temperature rise and heat drop, the temperature gradient of concrete and the relations between pumping's temperature and thermal spike. Furthermore, the measures which are used to prevent concrete cracks caused by great temperature difference are given.
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Received: 22 September 2005
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2006, Vol. 23 
