CFRP加固对冻融再生混凝土短柱承载能力的影响
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摘要
为减小冻融循环对再生混凝土力学性能的影响,提高严寒地区再生混凝土的耐久性能,系统研究了冻融循环作用下再生粗骨料替代率、冻融-碳纤维布(CFRP)加固作用顺序对再生混凝土短柱试件承载能力的影响.结果表明:冻融循环作用使再生混凝土短柱试件极限承载力大幅降低,CFRP加固可以使再生粗骨料替代率为0%,50%和100%的再生混凝土短柱试件极限承载力分别提高到冻融前试件极限承载力的1.514,1.502和2.088倍,CFRP加固不仅可以大幅提高再生混凝土的抗冻融损伤性能,还可以有效修复、弥补冻融损伤再生混凝土的承载能力;先CFRP加固后冻融试件的承载能力优于先冻融后CFRP加固试件.用CFRP加固混凝土短柱的环箍力-轴向应变关系、混凝土单轴受压主动侧限本构关系和CFRP加固下的混凝土被动侧限本构关系建立了适用于冻融循环与CFRP加固共同影响下的再生混凝土短柱试件极限承载力公式.
In order to ameliorate the durability of recycled concrete at cold regions, the effects of the replacement rate of recycled concrete and sequence of carbon fiber reinforced polymer(CFRP) reinforcement on the loading capacity of recycled concrete columns under freeze-thaw cycled environment were systematically investigated. The experimental result shows that the ultimate bearing capacity of recycled concrete without CFRP reinforcement is significantly reduced by freeze-thaw cycle. However, surprisingly, the postmortem CFRP reinforcement with 0%, 50%and 100% recycled concrete can improve the ultimate bearing capacity of freeze-thaw cycled samples to levels of about 1.514, 1.502 and 2.088 times higher than that of the corresponding samples not suffered freeze-thaw cycle, respectively. These indicate that CFRP reinforcement is an effective way in recuperating the load bearing capacity and optimizing the damage resistance of recycled concrete under freeze-thaw cycled environment. In addition, the pre-reinforced columns after freeze-thaw cycle still exhibit higher ultimate bearing capacity than that of the original samples without reinforcement. Basing on both the axial compression constitutive model and the relationship between radial force and axial strain, a new load bearing formula is deduced for recycled concrete column under the influence of both CFRP reinforcement and freeze-thaw cycle.
In order to ameliorate the durability of recycled concrete at cold regions, the effects of the replacement rate of recycled concrete and sequence of carbon fiber reinforced polymer(CFRP) reinforcement on the loading capacity of recycled concrete columns under freeze-thaw cycled environment were systematically investigated. The experimental result shows that the ultimate bearing capacity of recycled concrete without CFRP reinforcement is significantly reduced by freeze-thaw cycle. However, surprisingly, the postmortem CFRP reinforcement with 0%, 50%and 100% recycled concrete can improve the ultimate bearing capacity of freeze-thaw cycled samples to levels of about 1.514, 1.502 and 2.088 times higher than that of the corresponding samples not suffered freeze-thaw cycle, respectively. These indicate that CFRP reinforcement is an effective way in recuperating the load bearing capacity and optimizing the damage resistance of recycled concrete under freeze-thaw cycled environment. In addition, the pre-reinforced columns after freeze-thaw cycle still exhibit higher ultimate bearing capacity than that of the original samples without reinforcement. Basing on both the axial compression constitutive model and the relationship between radial force and axial strain, a new load bearing formula is deduced for recycled concrete column under the influence of both CFRP reinforcement and freeze-thaw cycle.
引文
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[25] HASAN M,VEDA T,SATO Y.Stress-strain relationship of frost-damaged concrete subjected to fatique loading[J].Journal of Materials in Civil Engineering,2008,20(1):37-45.
[26] PETERSEN L,LOHAUS L,POLAK M A.Influence of freezing-and-thawing damage on behavior of reinforced concrete elements[J].ACI Materials Journal,2007,104(4):369-378.
[27] SAFIUDDIN M D,YAKHLAF M,SOUDKI K A.Key mechanical properties and microstructure of carbon fibre reinforced self-consolidating concrete[J].Construction and Building Materials,2018,164:477-488.
[28] ZHAO Y R,WANG L,LEI L K.Study on bending damage and failure of basalt fiber reinforced concrete under freeze-thaw cycles[J].Construction and Building Materials,2018,163:160-470.
[29] 洪雷,张雨剑,王苏岩.冻融循环作用下CFRP-高强混凝土的界面行为[J].水利与建筑工程学报,2016,14(3):200-205.HONG Lei,ZHANG Yujian,WANG Suyan.The interface behavior of CFRP-high strength concrete under freeze-thaw cycles[J].Journal of Water Resources and Architectural Engineering,2016,14(3):200-205.(in Chinese)
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[31] 王苏岩,宋泽林,丁荔.冻融循环与持载对CFRP加固高强混凝土梁变形性能的研究[J].建筑科学与工程学报,2017,34(2):26-32.WANG Suyan,SONG Zelin,DING Li.Influence of freeze-thaw cycles and sustained loads on deformation performance of high strength concrete beam strengthened with CFRP[J].Journal of Architecture and Civil Engineering,2017,34(2):26-32.(in Chinese)
[32] 王颖.不同加固方式对严重受损钢筋混凝土短柱受压性能试验研究[D].石河子:石河子大学,2016.WANG Ying.Experimental study on compression behavior of severely damaged reinforced concrete short columns by different reinforcement methods[D].Shihezi:Shihezi University,2016.(in Chinese)
[33] 段安,钱稼茹.混凝土冻融过程数值模拟与分析[J].清华大学学报(自然科学版),2009,49(9):1441-1445.DUAN An,QIAN Jiaru.Mathematical modeling and analysis of concrete subjected to freeze-thaw cycles[J].Tsinghua University(Science and Technology),2009,49(9):1441-1445.(in Chinese)
[34] 段安.受冻融混凝土本构关系研究和冻融过程数值模拟[D].北京:清华大学,2009.DUAN An.Research on constitutive relationship of frozen-thawed concrete and mathematical modeling of freeze-thaw process[D].Beijing:Tsinghua University,2009.(in Chinese)
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[36] 魏华.CFRP加固局部强度不足混凝土柱受压力学性能研究[D].大连:大连理工大学,2009.WEI Hua.Compressive performance study on CFRP wrapped concrete columns with partial deteriorated strength[D].Dalian:Dalian University of Technology,2009.(in Chinese)
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[2] XIAO J,LI W,FAN Y,et al.An overview of study on recycled aggregate concrete in China(1996-2011)[J].Construction and Building Materials,2012,31:364-383.
[3] MENDIS P,ROBERT H.Methodology for the integrated assessment on the use of recycled concrete aggregate replacing natural aggregate in structural concrete[J].Journal of Cleaner Production,2017,166:321-334.
[4] MENDIS P,ROBERT H.Integrated assessment of the use of recycled concrete aggregate replacing natural aggregate in structural concrete[J].Journal of Cleaner Production,2018,174:591-604.
[5] MICHAEL J,GINNIS M.,DAVIS M,et al.Strength and stiffness of concrete with recycled concrete aggregates[J].Construction and Building Materials,2017,154:258-269.
[6] THOMAS C,SETIN J,POLANCO J A,et al.Durability of recycled aggregate concrete[J].Construction and Building Materials,2013,40:1054-1065.
[7] OMARY S,GHORBEL E,WARDEH G.Relationships between recycled concrete aggregates characteristics and recycled aggregates concretes properties[J].Construction and Building Materials,2016,108:163-174.
[8] 朱方之,赵铁军,张卫东.冻融和其他因数复合下混凝土耐久性研究进展[J].材料导报:A,2011,25(10):143-154.ZHU Fangzhi,ZHAO Tiejun,ZHANG Weidong.Research progress on durability of concrete under freeze-thaw and other factors[J].Materials Review:A,2011,25(10):143-154.(in Chinese)
[9] 郑元勋,杨培冰,康海贵.冻融环境下混凝土结构耐久性研究综述[J].郑州大学学报(工学版),2016,37(5):27-32.ZHENG Yuanxun,YANG Peibing,KANG Haigui.Research on durability of concrete structures in freeze-thaw environment[J].Journal of Zhengzhou University(Engineering Science),2016,37(5):27-32.(in Chinese)
[10] SHANG H H,SONG Y F,QIN L K.Experimental study on strength and deformation of plain concrete under triaxial compression after freeze-thaw cycles[J].Building and Environment,2008,42:1197-1204.
[11] MEDINA C S,ROJAS M I,FRAS M.Freeze-thaw durability of recycled concrete containing ceramic aggregate[J].Journal of Cleaner Production,2013,40:151-160.
[12] 邹超英,范玉辉,胡琼.冻融循环后再生混凝土基本力学性能试验[J].建筑结构,2010,40(4):434-438.ZOU Chaoying,FAN Yuhui,HU Qiong.Experimental study on mechanical properties of recycled concrete after freeze-thaw cycle[J].Building Construcure,2010,40(4):434-438.(in Chinese)
[13] 邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律[J].建筑结构学报,2008,29(1):117-138.ZOU Chaoying,ZHAO Juan,LIANG Feng,et al.Degration of mechanical properties of concrete caused by freeze thaw action[J].Journal of Building Structures,2008,29(1):117-138.(in Chinese)
[14] 肖建庄,王长青,孙振平.再生粗骨料取代率对约束再生混凝土动态力学行为的影响[J].土木工程学报,2016,49(2):8-13.XIAO Jianzhuang,WANG Changqing,SUN Zhenping.Effects of recycled coarse aggregate replacement ratios on dynamic mechanical behavior of confined recycled aggregate concrete[J].China Civil Engineering Journal,2016,49(2):8-13.(in Chinese)
[15] 肖建庄,李佳彬,黄健.再生粗骨料取代率对混凝土抗压强度的影响[J].建筑材料学报,2006,9(3):297-305.XIAO Jianzhuang,LI Jiabin,HUANG Jian.Influence of recycled coarse aggregate replacement percentages on compressive strength of concrete[J].Journal of Building Materials,2006,9(3):297-305.(in Chinese)
[16] EVABGELISTA L,BRITO J D.Durability performance of concrete made with fine recycled concrete aggregates[J].Cement and Concrete Composites,2010,32:9-14.
[17] PEDRO D,BRITO J D,EVABGELISTA L.Structural concrete with simultaneous incorporation of fine and coarse recycled concrete aggregates:Mechanical,durability and long-term properties[J].Construction and Building Materials,2017,154:294-309.
[18] DIMOTRIOU G,SAVVA P,MICHAEL F.Enhancing mechanical and durability properties of recycled aggregate concrete[J].Construction and Building Materials,2018,158:228-235.
[19] 邹超英,赵娟,梁锋,等.冻融环境下混凝土应力-应变关系的试验研究[J].哈尔滨工业大学学报,2007,39(2):229-231.ZOU Chaoying,ZHAO Juan,LIANG Feng,et al.Experim ental study on stress-strain relationship of concrete in freeze-thaw environment[J].Journal of Harbin Institute of Technology,2007,39(2):229-231.(in Chinese)
[20] YU H F,MA HX,YAN K.An equation for determining freeze-thaw fatigue damage in concrete and a model for predicting the service life[J].Construction and Building Materials,2017,137:104-116.
[21] DUAN A,JIN W L,QIAN J R.Effect of freeze-thaw cycles on the stress-strain curves of unconfined and confined concrete[J].Materials and Structures,2011,44:1309-1324.
[22] QIN X C,MENG S B,CAO D F.Evaluation of freeze-thaw damage on concrete material and prestressed concrete specimens[J].Construction and Building Materials,2016,125:892-904.
[23] 关虓,王家滨,王艳,等.基于Weibull强度理论的混凝土冻融损伤本构模型研究[J].混凝土,2015(5):5-13.GUAN Xiao,WANG Jiabin B,WANG Yan,et al.Study of the freezing-thawing damage constitutive model of concrete based on Weibull's strength theory[J].Concrete,2015(5):5-13.(in Chinese)
[24] 冀晓东,宋玉普,刘建.混凝土冻融损伤本构模型研究[J].计算力学学报,2011,28(3):461-467.JI Xiaodong,SONG Yupu,LIU Jian.Study on constitutive model of concrete freeze-thaw damage[J].Chinese Journal of Computational Mechanics,2011,28(3):461-467.(in Chinese)
[25] HASAN M,VEDA T,SATO Y.Stress-strain relationship of frost-damaged concrete subjected to fatique loading[J].Journal of Materials in Civil Engineering,2008,20(1):37-45.
[26] PETERSEN L,LOHAUS L,POLAK M A.Influence of freezing-and-thawing damage on behavior of reinforced concrete elements[J].ACI Materials Journal,2007,104(4):369-378.
[27] SAFIUDDIN M D,YAKHLAF M,SOUDKI K A.Key mechanical properties and microstructure of carbon fibre reinforced self-consolidating concrete[J].Construction and Building Materials,2018,164:477-488.
[28] ZHAO Y R,WANG L,LEI L K.Study on bending damage and failure of basalt fiber reinforced concrete under freeze-thaw cycles[J].Construction and Building Materials,2018,163:160-470.
[29] 洪雷,张雨剑,王苏岩.冻融循环作用下CFRP-高强混凝土的界面行为[J].水利与建筑工程学报,2016,14(3):200-205.HONG Lei,ZHANG Yujian,WANG Suyan.The interface behavior of CFRP-high strength concrete under freeze-thaw cycles[J].Journal of Water Resources and Architectural Engineering,2016,14(3):200-205.(in Chinese)
[30] 管巧艳,高丹盈,李杉.冻融循环作用后CFRP与混凝土粘结性能研究[J].工业建筑,2010,40(6):9-12.GUAN Qiaoyan,GAO Danying,LI Shan.Study on CFRP-concrete bond behavior subjected to freeze-thaw cycles[J].Industry Construction,2010,40(6):9-12.(in Chinese)
[31] 王苏岩,宋泽林,丁荔.冻融循环与持载对CFRP加固高强混凝土梁变形性能的研究[J].建筑科学与工程学报,2017,34(2):26-32.WANG Suyan,SONG Zelin,DING Li.Influence of freeze-thaw cycles and sustained loads on deformation performance of high strength concrete beam strengthened with CFRP[J].Journal of Architecture and Civil Engineering,2017,34(2):26-32.(in Chinese)
[32] 王颖.不同加固方式对严重受损钢筋混凝土短柱受压性能试验研究[D].石河子:石河子大学,2016.WANG Ying.Experimental study on compression behavior of severely damaged reinforced concrete short columns by different reinforcement methods[D].Shihezi:Shihezi University,2016.(in Chinese)
[33] 段安,钱稼茹.混凝土冻融过程数值模拟与分析[J].清华大学学报(自然科学版),2009,49(9):1441-1445.DUAN An,QIAN Jiaru.Mathematical modeling and analysis of concrete subjected to freeze-thaw cycles[J].Tsinghua University(Science and Technology),2009,49(9):1441-1445.(in Chinese)
[34] 段安.受冻融混凝土本构关系研究和冻融过程数值模拟[D].北京:清华大学,2009.DUAN An.Research on constitutive relationship of frozen-thawed concrete and mathematical modeling of freeze-thaw process[D].Beijing:Tsinghua University,2009.(in Chinese)
[35] 刘涛.CFRP布加固混凝土矩形柱的性能研究[D].上海:上海大学,2006.LIU Tao.Reseach on the behavior of rectangular concrete columns strengthened with CFRP sheets[D].Shanghai:Shanghai University,2006.(in Chinese)
[36] 魏华.CFRP加固局部强度不足混凝土柱受压力学性能研究[D].大连:大连理工大学,2009.WEI Hua.Compressive performance study on CFRP wrapped concrete columns with partial deteriorated strength[D].Dalian:Dalian University of Technology,2009.(in Chinese)
[37] 赵彤,谢剑.碳纤维布补强加固混凝土结构新技术[M].天津:天津大学出版社,2001:7-21.ZHAO Tong,XIE Jian.New technology of reinforcing concrete structure with CFRP[M].Tianjin:Tianjin University Press,2001:7-21.(in Chinese)
[38] 聂红宾.CFRP布加固冻融损伤混凝土构件力学性能研究[D].沈阳:沈阳大学,2013.NIE Hongbin.Research on behavior of freeze-thaw damageable concrete members strengthened by CFRP sheets[D].Shenyang:Shenyang University,2013.(in Chinese)
[39] 赵海波.CFRP加固高强混凝土柱轴心受压性能试验研究[D].大连:大连理工大学,2006.ZHAO Haibo.Test study on mechanical performance of high-strength concrete column confined by CFRP under axial load[D].Dalian:Dalian University of Technology,2006.(in Chinese)