混凝土低溫受壓強度試驗研究*
時旭東1，居易1，鄭建華2，富克2，張?zhí)焐?
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（1 清華大學(xué)土木工程系， 北京 100084； 2 中國寰球工程公司， 北京 100029）［摘要］通過給定配合比混凝土的低溫受壓試驗，考察混凝土在不同低溫作用工況下的力學(xué)性能變化規(guī)律。結(jié)果表明，不同低溫下混凝土立方體試件的破壞形態(tài)相似，但其破壞隨溫度的降低變得越來越突然?；炷恋牡蜏厥軌簭姸冉?jīng)歷損傷階段、快速增長階段和平穩(wěn)波動階段?；炷恋蜏厥軌簭姸仍诩s-20℃時達(dá)到極小值，其降幅達(dá)常溫的16.5%；在約-100℃時達(dá)到極大值，其增幅達(dá)常溫的57.5%。根據(jù)試驗結(jié)果和已有的研究結(jié)果建議了用于工程設(shè)計的混凝土低溫受壓強度相對增量計算公式。［關(guān)鍵詞］混凝土; 超低溫; 受壓強度; 試驗中圖分類號：TU528.1 文獻(xiàn)標(biāo)識碼：A 文章編號：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*國家自然科學(xué)基金項目（51078204），中國寰球工程公司科技研發(fā)課題（60010-1904-CA-BL-003）。作者簡介：時旭東，博士，教授，Email：shixd@mail.tsinghua.edu.cn。參考文獻(xiàn)［1］黃帆. 我國液化天然氣現(xiàn)狀及發(fā)展前景分析［J］.天然氣技術(shù), 2007(1):68-71.［2］王傳星, 謝劍, 楊建江. 超低溫環(huán)境下混凝土的性能［J］. 低溫建筑技術(shù), 2009(9): 8-10.［3］蔣正武, 張楠, 李雄英, 等.國外超低溫下混凝土性能的研究進(jìn)展評述［J］. 材料導(dǎo)報, 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.
