混凝土低温受压强度试验研究*
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（1 清华大学土木工程系， 北京 100084； 2 中国寰球工程公司， 北京 100029）［摘要］通过给定配合比混凝土的低温受压试验，考察混凝土在不同低温作用工况下的力学性能变化规律。结果表明，不同低温下混凝土立方体试件的破坏形态相似，但其破坏随温度的降低变得越来越突然。混凝土的低温受压强度经历损伤阶段、快速增长阶段和平稳波动阶段。混凝土低温受压强度在约-20℃时达到极小值，其降幅达常温的16.5%；在约-100℃时达到极大值，其增幅达常温的57.5%。根据试验结果和已有的研究结果建议了用于工程设计的混凝土低温受压强度相对增量计算公式。［关键词］混凝土; 超低温; 受压强度; 试验中图分类号：TU528.1 文献标识码：A 文章编号：1002-848X(2014)05-0029-05Experimental study on compressive strength of concrete exposed to cryogenic temperatureShi Xudong 1, Ju Yi1, Zheng Jianhua2, Fu Ke2, Zhang Tianshen1（1 Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 China Huanqiu Contracting & Engineering Corporation, Beijing 100029, China）Abstract: Through experiments of the given mix proportion concrete exposed to different cryogenic temperatures, the compressive mechanical properties were discussed. From the test results it can be shown that the failure modes of the cube concrete specimens at various cryogenic temperatures are similar, but the specimen failure becomes sudden with decrease in temperature. The compressive strength of concrete at cryogenic temperature experiences three phases: damage stage, rapid growth stage and stationary fluctuation stage. The compressive strength of concrete reaches a minimum value at about -20℃ with a drop of 16.5% relative to that at normal temperature and a maximum value at about -100℃ with an increase of 57.5% relative to that at normal temperature respectively. Based on the experiment and the existing results, a relative increment formula for the compressive strength of concrete applied to the engineering design of concrete structures at cryogenic temperature is also provided.Keywords: concrete; cryogenic temperature; compressive strength; experiment*国家自然科学基金项目（51078204），中国寰球工程公司科技研发课题（60010-1904-CA-BL-003）。作者简介：时旭东，博士，教授，Email：shixd@mail.tsinghua.edu.cn。参考文献［1］黄帆. 我国液化天然气现状及发展前景分析［J］.天然气技术, 2007(1):68-71.［2］王传星, 谢剑, 杨建江. 超低温环境下混凝土的性能［J］. 低温建筑技术, 2009(9): 8-10.［3］蒋正武, 张楠, 李雄英, 等.国外超低温下混凝土性能的研究进展评述［J］. 材料导报, 2011, 25（7）: 1-4.［4］MARAHALL A L. Cryogenic concrete［J］. Cryogenics, 1982, 22(11): 555-565.［5］BERNER D E, GERWICK JR B C. Static and cyclic behavior of structural lightweight concrete at cryogenic temperature［M］//Ocean Space Utilization’ 85.1985:439-445.［6］MONFORE G E, LENTZ A E. Physical properties of concrete at very low temperature ［J］. Journal of the PCA Res Devel Lab, 1962,4(2):33-39.［7］YAMANE S, KASAMI H, OKUN T. Properties of concrete at very low temperatures［C］//Douglas McHenry International Symposium on Concrete and Concrete Structures, ACI Publ SP-55(1978):207-211.［8］BROWNE R D, BAMFOURTH P B. The use of concrete for cryogenic storage: A summary of research, past and present［C］//Proceedings of the 1st International Conference on Cryogenic Concrete. London: Construction Press, 1981: 135-166.［9］TAKASHI MIURA. The properties of concrete at very low temperatures［J］. Materials and Structures, 1989, 22(4): 243-254.［10］OKADA T, IGURO M. Bending behaviour of prestressed concrete beams under low temperatures［J］. Journal of Japan Prestressed Concrete Engineering Association, 1978, 20(8): 15-17.［11］ROSTASY F S. Verfestigung und versprodung von beton durch tiefe temperaturen［M］. Fortschritte im Konstruktiven Ingenieurbau, 1984: 229-239.
