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中文摘要：
热膨胀系数是大坝混凝土热学、体积稳定性能的重要表征参数,但在混凝土硬化初期常被忽视,目前测定混凝土早期热膨胀系数的方法尚无统一规定.采用非接触位移传感器结合循环式恒温水浴装置,通过小幅温升的方式实现了原位连续测试混凝土早期热膨胀系数;试验测试了不同配比的大坝混凝土早期热膨胀系数.结果显示,大坝混凝土在硬化后72 h内热膨胀系数变化显著,随后至7 d相对稳定,7 d的测值与标准方法测得混凝土90 d龄期的热膨胀系数基本一致.
英文摘要：
Thermal expansion coefficient（TEC） is an important parameter for the thermal property and volume stability property of dam concrete,but it is often ignored at early age.There is no common method used to test TEC of concrete at early age now.In this paper,non-contact displacement transducer and constant temperature water baths are applied to measure the TEC of different dam concrete at early age.In the process of testing,temperature-rising range is limited,and method of continuous testing in-situ is adopted.The results indicate that TEC of dam concrete is evidently changed in 72 hours after setting and relatively steady at late age.These results of TEC at 7 days are in good agreement with those from standard testing at 90 days.
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