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25 August 2009 Online measured hydration heat for 32 meter span concrete box bridge girders during construction process
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73755C (2009) https://doi.org/10.1117/12.839339
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
Abstract
The concrete stress induced by temperature change is regarded as one of the main causes of concrete box girder cracking. To understand the hydration heat distribution on the box girder transverse section, the concrete hydration heat temperature effect experiments were done according to the box girder construction condition, providing useful reference for box girder design and construction practice. The measured locations for concrete hydration heat were chosen as the middle span section and tip sections of box bridge girder. The temperature sensors were embedded in the concrete box girder at the top tray, bottom tray and web of the box girder during concrete pour construction. Then the time-history record for concrete hydration heat was recorded. According to the measured results for temperature, the time-history curve for concrete hydration heat process could be drawn. According to the 32 meter span concrete box girder hydration heat analysis result of Wuhan-Guangzhou railway express line, the common law of hydration heat during early concrete hydration heat process was obtained, including the basic laws of the concrete hydration temperature rise and heat drop, the temperature gradient of concrete and the relations between pumping temperature and thermal climax. Furthermore, the measured hydration heat temperature result provides useful information for preventing concrete cracks caused by temperature difference and temperature changing.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yuan Hua and Taiquan Zhou "Online measured hydration heat for 32 meter span concrete box bridge girders during construction process", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73755C (25 August 2009); https://doi.org/10.1117/12.839339
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