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- Title
Test and analysis on hydration of concrete three-cell box girder.
- Authors
Yu Yang; Zhang Feng; Zhang Lei; Liu Jinyi
- Abstract
To study the hydration heat distribution of concrete within 96 h of the casting of a three-cell box girder, a concrete box girder scale down model was cast. 258 temperature sensors were embedded in the concrete. Photoelectric radiation sensors and wind speed sensors were arranged. A temperature field test model considering solar radiation was established. The results show that the maximum temperature and the maximum vertical temperature difference of the three-cell box girder both occur at the haunch with the maximum temperature of 71.2 °C and the maximum temperature difference of the whole section reaching 25.6 °C. Based on response surface analysis and numerical simulation, the thickness of the top geotextile is an important influencing factor for the vertical temperature difference of the two webs, and a prediction equation for the maximum vertical temperature difference of different webs is proposed. Compared with the working condition with an initial concrete temperature of 35 °C and without geotextile cover, an initial concrete temperature of 15 °C and an 8 mm geotextile cover can reduce the vertical temperature difference between the side webs and the middle webs to 22.1% and 24. 7% under the original working condition, respectively.
- Subjects
HYDRATION; BOX beams; PHOTOELECTRIC cells; TEMPERATURE lapse rate; GEOTEXTILES
- Publication
Journal of Southeast University / Dongnan Daxue Xuebao, 2022, Vol 52, Issue 6, p1043
- ISSN
1001-0505
- Publication type
Article
- DOI
10.3969/j.issn.1001-0505.2022.06.003