| HU Yintao,ZHOU Qiujing,YANG Ning,QIAO Yu,JIA Fan,Xin Jianda.Experimental study on temperature stress calculation and temperature control optimization of concrete based on early age parameters[J].中国水利水电科学研究院学报,2023,21(6):586-598 |
| Experimental study on temperature stress calculation and temperature control optimization of concrete based on early age parameters |
| Experimental study on temperature stress calculation and temperature control optimization of concrete based on early age parameters |
| 投稿时间：2023-05-12 |
| DOI：10.13244/j.cnki.jiwhr.20230089 |
| 中文关键词: concrete dam temperature control curve early-age parameters temperature stress testing machine elastic modulus |
| 英文关键词:concrete dam temperature control curve early-age parameters temperature stress testing machine elastic modulus |
| 基金项目:National Key R&D Plan Project(No.2021YFC3090102) |
| 作者 | 单位 | | HU Yintao | China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | ZHOU Qiujing | China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | YANG Ning | China Three Gorges Construction Engineering Corporation, Beijing 101100, China | | QIAO Yu | China Three Gorges Construction Engineering Corporation, Beijing 101100, China | | JIA Fan | China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | Xin Jianda | China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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| 摘要点击次数: 472 |
| 全文下载次数: 734 |
| 中文摘要: |
| Temperature control curve is the key to achieving temperature control and crack prevention of high concrete dam during construction，and its rationality depends on the accurate measurement of temperature stress.With the simulation testing machine for the temperature stress，in the present study，we carried out the deformation process tests of concrete under three temperature curves：convex，straight and concave.Besides，we not only measured the early-age elastic modulus，creep parameters and stress process，but also proposed the preferred type.The results show that at early age，higher temperature always leads to greater elastic modulus and smaller creep.However，the traditional indoor experiments have underestimated the elastic modulus and creep development at early age，which makes the calculated value of temperature stress too small，thus increasing the cracking risk.In this study，the stress values of the three curves calculated based on the strain and early-age parameters are in good agreement with the temperature stress measured by the temperature stress testing machine，which verifies the method accuracy.When the temperature changes along the concave curve，the law of stress development is in consistent with that of strength.Under this condition，the stress fluctuation is small and the crack prevention safety of the concave type is higher，so the concave type is better.The test results provide a reliable basis and support for temperature control curve design and optimization of concrete dams. |
| 英文摘要: |
| Temperature control curve is the key to achieving temperature control and crack prevention of high concrete dam during construction，and its rationality depends on the accurate measurement of temperature stress.With the simulation testing machine for the temperature stress，in the present study，we carried out the deformation process tests of concrete under three temperature curves：convex，straight and concave.Besides，we not only measured the early-age elastic modulus，creep parameters and stress process，but also proposed the preferred type.The results show that at early age，higher temperature always leads to greater elastic modulus and smaller creep.However，the traditional indoor experiments have underestimated the elastic modulus and creep development at early age，which makes the calculated value of temperature stress too small，thus increasing the cracking risk.In this study，the stress values of the three curves calculated based on the strain and early-age parameters are in good agreement with the temperature stress measured by the temperature stress testing machine，which verifies the method accuracy.When the temperature changes along the concave curve，the law of stress development is in consistent with that of strength.Under this condition，the stress fluctuation is small and the crack prevention safety of the concave type is higher，so the concave type is better.The test results provide a reliable basis and support for temperature control curve design and optimization of concrete dams. |
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