高温后混凝土质量损失及抗压强度退化规律试验研究
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摘要
为研究混凝土高温后质量损失及抗压强度的退化规律,对高温后混凝土立方体试件的质量损失和抗压性能进行了测试,分析了温度对混凝土的质量损失和抗压强度的影响以及高温后混凝土的受压破坏特征。研究结果表明,随着温度的升高,混凝土的质量损失逐渐增大而抗压强度整体呈下降趋势,800℃的高温作用后混凝土抗压强度基本丧失,相比于常温其损失程度高达85.4%;总体而言,混凝土抗压强度随温度升高而减小的幅度与质量损失率随温度升高而增大的幅度基本一致。通过对试验数据的拟合回归分析,建立了混凝土抗压强度与温度、质量损失率与温度及抗压强度与质量损失率之间的计算公式,可利用所提出的公式通过混凝土质量损失或受火温度来初步预估火灾后混凝土结构的剩余抗压强度。
To investigate the mass loss and compressive strength degradation law of concrete after high temperature exposure, the mass loss and compressive properties of concrete cube specimen after temperature exposure was investigated. The effect of temperature on mass loss and compressive strength of concrete and the compression failure characteristics after temperature exposure was analyzed. The research results show that the compressive strength of concrete decreases gradually and the mass loss of concrete increases gradually with the high temperature increases. After 800℃, the compressive strength of concrete is basically vanished, which is up to 85.4% loss compared to the normal temperature. In general, the decreasing extent in the compressive strength of concrete with increase of temperature are basically consistent to that of the growth in the mass loss rate of concrete with increase of temperature. Through fitting regression analysis of test data, the formulas were established for calculating the compressive strength of concrete with temperature, calculating mass loss rate and temperature, and calculating compressive strength and mass loss rate. The formulas could be used to predict the residual compressive strength of concrete after fire through mass loss and temperature.
To investigate the mass loss and compressive strength degradation law of concrete after high temperature exposure, the mass loss and compressive properties of concrete cube specimen after temperature exposure was investigated. The effect of temperature on mass loss and compressive strength of concrete and the compression failure characteristics after temperature exposure was analyzed. The research results show that the compressive strength of concrete decreases gradually and the mass loss of concrete increases gradually with the high temperature increases. After 800℃, the compressive strength of concrete is basically vanished, which is up to 85.4% loss compared to the normal temperature. In general, the decreasing extent in the compressive strength of concrete with increase of temperature are basically consistent to that of the growth in the mass loss rate of concrete with increase of temperature. Through fitting regression analysis of test data, the formulas were established for calculating the compressive strength of concrete with temperature, calculating mass loss rate and temperature, and calculating compressive strength and mass loss rate. The formulas could be used to predict the residual compressive strength of concrete after fire through mass loss and temperature.
引文
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[2] ISMAIL M, ISMAIL M E, MUHAMMAD B. Influence of elevated temperatures on physical and compressive strength properties of concrete containing palm oil fuel ash[J]. Construction and Building Materials, 2011, 25(5):2358-2364.
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[8] 杜红秀, 张宁, 王慧芳, 等. 聚丙烯纤维对高强混凝土高温后残余抗压强度的影响[J].太原理工大学学报, 2012, 43(2):207-210.
[9] 李海艳, 郑文忠, 罗百福. 高温后RPC立方体抗压强度退化规律研究[J]. 哈尔滨工业大学学报, 2012, 44(4):17-22.
[10] 吴波, 袁杰, 王光远. 高温后高强混凝土力学性能的试验研究[J]. 土木工程学报, 2000, 33(2):8-12.
[11] 余志武, 资伟, 匡亚川, 等. 受热温度和时间对混凝土抗压强度的影响[J]. 消防科学与技术, 2012, 31(2):111-114.
[12] 张白, 陈俊, 杨鸥, 等. 水灰比对高温下混凝土质量损失及抗压强度影响试验研究[J]. 防灾减灾工程学报, 2018, 38(6):1012-1019.
[13] 史英豪, 杜红秀, 阎蕊珍. 高温后C80高强混凝土的质量损失和抗压性能研究[J]. 硅酸盐通报, 2016, 35(3):980-988.
[14] BING?L A F, Gül R. Residual bond strength between steel bars and concrete after elevated temperatures[J]. Fire Safety Journal, 2009, 44(6):854-859.
[15] 李悦, 童欢, 杨进波. 硬化混凝土原始组分测定方法综述[J]. 混凝土, 2013(10):33-37.
[16] 翟越, 艾晓芹, 邓子辰, 等. 受火温度和冷却方式对混凝土抗压强度影响[J]. 湖南大学学报(自然科学版), 2014, 41(11):74-80.
[17] 阎蕊珍. 高温对C40高性能混凝土物理力学性能的影响研究[D]. 太原:太原理工大学, 2015.
[18] 陈宗平, 王欢欢, 陈宇良. 高温后混凝土的力学性能试验研究[J]. 混凝土, 2015(1):13-17.
[19] 邵伟, 陈有亮, 周有成. 不同温度及不同加热时间作用后混凝土力学性能试验研究[J]. 防灾减灾工程学报, 2012, 32(2):248-252.
[20] 余志武, 资伟, 匡亚川, 等. 受热温度和时间对混凝土抗压强度的影响[J]. 消防科学与技术, 2012, 31(2):111-114.
[21] 梁爱莉, 张倩茜, 袁广林, 等. 混凝土高温后抗压强度的影响因素研究[J]. 煤炭学报, 2010, 35(12):2049-2052.
[22] 吴波, 袁杰, 王光远. 高温后高强混凝土力学性能的试验研究[J]. 土木工程学报, 2000, 33(2):8-12.
[23] ERGüN A, KüRKLü G, BA?PINAR M S. The effects of material properties on bond strength between reinforcing bar and concrete exposed to high temperature[J]. Construction & Building Materials, 2016, 112(6):691-698.
[24] 肖建庄, 李佳彬, 孙振平, 等. 再生混凝土的抗压强度研究[J]. 同济大学学报(自然科学版), 2004, 32(12):1558-1561.
[25] HADDAD R H, AL-SALEH R J, AL-AKHRAS N M. Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete[J]. Fire Safety Journal, 2008, 43(5):334-343.
[26] MOUSA, MAGDA I. Effect of elevated temperature on the properties of silica fume and recycled rubber-filled high strength concretes (RHSC)[J]. HBRC Journal, 2017, 13(4):1-7.
[2] ISMAIL M, ISMAIL M E, MUHAMMAD B. Influence of elevated temperatures on physical and compressive strength properties of concrete containing palm oil fuel ash[J]. Construction and Building Materials, 2011, 25(5):2358-2364.
[3] 赵东拂, 刘梅. 高强混凝土高温后剩余强度及无损检测试验研究[J]. 建筑结构学报, 2015, 36(2):365-372.
[4] 吴波, 宿晓萍, 李惠, 等. 高温后约束高强混凝土力学性能的试验研究[J]. 土木工程学报, 2002, 35(2):26-32.
[5] 李敏. 高强混凝土受火损伤及其综合评价研究[D]. 南京:东南大学, 2005.
[6] 杜红秀, 张雄. HSC/HPC的火灾(高温)性能研究进展[J].建筑材料学报, 2003, 6(4):391-396.
[7] 肖建庄, 王平. 掺聚丙烯纤维高性能混凝土高温后的抗压性能[J]. 建筑材料学报, 2004, 7(3):281-285.
[8] 杜红秀, 张宁, 王慧芳, 等. 聚丙烯纤维对高强混凝土高温后残余抗压强度的影响[J].太原理工大学学报, 2012, 43(2):207-210.
[9] 李海艳, 郑文忠, 罗百福. 高温后RPC立方体抗压强度退化规律研究[J]. 哈尔滨工业大学学报, 2012, 44(4):17-22.
[10] 吴波, 袁杰, 王光远. 高温后高强混凝土力学性能的试验研究[J]. 土木工程学报, 2000, 33(2):8-12.
[11] 余志武, 资伟, 匡亚川, 等. 受热温度和时间对混凝土抗压强度的影响[J]. 消防科学与技术, 2012, 31(2):111-114.
[12] 张白, 陈俊, 杨鸥, 等. 水灰比对高温下混凝土质量损失及抗压强度影响试验研究[J]. 防灾减灾工程学报, 2018, 38(6):1012-1019.
[13] 史英豪, 杜红秀, 阎蕊珍. 高温后C80高强混凝土的质量损失和抗压性能研究[J]. 硅酸盐通报, 2016, 35(3):980-988.
[14] BING?L A F, Gül R. Residual bond strength between steel bars and concrete after elevated temperatures[J]. Fire Safety Journal, 2009, 44(6):854-859.
[15] 李悦, 童欢, 杨进波. 硬化混凝土原始组分测定方法综述[J]. 混凝土, 2013(10):33-37.
[16] 翟越, 艾晓芹, 邓子辰, 等. 受火温度和冷却方式对混凝土抗压强度影响[J]. 湖南大学学报(自然科学版), 2014, 41(11):74-80.
[17] 阎蕊珍. 高温对C40高性能混凝土物理力学性能的影响研究[D]. 太原:太原理工大学, 2015.
[18] 陈宗平, 王欢欢, 陈宇良. 高温后混凝土的力学性能试验研究[J]. 混凝土, 2015(1):13-17.
[19] 邵伟, 陈有亮, 周有成. 不同温度及不同加热时间作用后混凝土力学性能试验研究[J]. 防灾减灾工程学报, 2012, 32(2):248-252.
[20] 余志武, 资伟, 匡亚川, 等. 受热温度和时间对混凝土抗压强度的影响[J]. 消防科学与技术, 2012, 31(2):111-114.
[21] 梁爱莉, 张倩茜, 袁广林, 等. 混凝土高温后抗压强度的影响因素研究[J]. 煤炭学报, 2010, 35(12):2049-2052.
[22] 吴波, 袁杰, 王光远. 高温后高强混凝土力学性能的试验研究[J]. 土木工程学报, 2000, 33(2):8-12.
[23] ERGüN A, KüRKLü G, BA?PINAR M S. The effects of material properties on bond strength between reinforcing bar and concrete exposed to high temperature[J]. Construction & Building Materials, 2016, 112(6):691-698.
[24] 肖建庄, 李佳彬, 孙振平, 等. 再生混凝土的抗压强度研究[J]. 同济大学学报(自然科学版), 2004, 32(12):1558-1561.
[25] HADDAD R H, AL-SALEH R J, AL-AKHRAS N M. Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete[J]. Fire Safety Journal, 2008, 43(5):334-343.
[26] MOUSA, MAGDA I. Effect of elevated temperature on the properties of silica fume and recycled rubber-filled high strength concretes (RHSC)[J]. HBRC Journal, 2017, 13(4):1-7.