- 摘 要
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(清華大學(xué)土木工程系,北京 100084)
[摘要]通過不同強(qiáng)度等級(jí)和水灰比混凝土的高溫試驗(yàn),考察這些因素對(duì)混凝土強(qiáng)度高溫衰退性能的影響。結(jié)果表明,隨溫度增加,混凝土強(qiáng)度并非單調(diào)下降,而是經(jīng)歷低溫衰減、恢復(fù)和高溫衰退3個(gè)階段。但不同等級(jí)混凝土高溫強(qiáng)度仍具有相同的變化規(guī)律,并在200℃附近有一個(gè)極小值。
[關(guān)鍵詞]混凝土;高溫;強(qiáng)度;失重;截面有效面積
Experimental research on strength decaying of concrete with different grades at elevated temperatureXiao Minghui, Shi Xudong, Xing Wanli(Department of Civil Engineering Tsinghua University, Beijing 100084, China)
Abstract:Through high temperature experiments of concrete with different strength grades and water cement ratios, the effect of these influencing factors on its strength decaying was examined. From the test results it is shown that the concrete strength does not monotonously decline with increase in action temperature and experiences three successive phases: declining at low temperature, recovery and decaying at high temperature. But there still exists a similar trend for different strength grade concretes and has a minimal value at about 200℃.
Keywords:concrete; high temperature; strength; weight loss; sectional effective area
國家自然科學(xué)基金項(xiàng)目(50278049)。
作者簡(jiǎn)介:肖明輝,碩士,Email:10033456@qq.com。
參考文獻(xiàn)
[1] 過鎮(zhèn)海,時(shí)旭東.鋼筋混凝土的高溫性能及其計(jì)算[M].北京:清華大學(xué)出版社,2003.
[2] 過鎮(zhèn)海,李衛(wèi).混凝土耐熱力學(xué)性能的試驗(yàn)研究總結(jié)[M].清華大學(xué)土木系,1989.
[3] 過鎮(zhèn)海,時(shí)旭東.鋼筋混凝土原理和分析[M].北京:清華大學(xué)出版社,2003.
[4] 南建林.溫度-應(yīng)力耦合作用下混凝土力學(xué)性能的試驗(yàn)研究[D].北京:清華大學(xué),1994.
[5] 悉尼·明德斯,J·弗朗西斯·楊.混凝土[M].北京:中國建筑工業(yè)出版社,1989.
[6] 巖崎訓(xùn)明(日).混凝土的特性[M].北京:中國建筑工業(yè)出版社,1980.
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