锈蚀植筋下新老混凝土黏结面压剪试验研究
|
摘要
为研究锈蚀植筋下新老混凝土的黏结性能,采用某工程锈蚀钢筋作为植筋,制备了不同植筋率(0、0.223%、0.446%、0.502%、0.893%、1.004%、1.396%、1.786%和2.792%)的新老混凝土试件.在RYL-600微机控制岩石伺服剪切流变仪上进行了不同初始静压力(0、1、2、3和4 MPa)下混凝土试件的剪切试验.对试件的剪应力-位移曲线进行了归纳总结,得到了锈蚀植筋下新老混凝土试件在外力作用下产生变形乃至破坏的演化规律;分析了锈蚀植筋下新老混凝土黏结面的抗剪强度,得到了抗剪强度随植筋率及初始静压力变化的规律.同时根据试件试验破坏结果,着重分析了不同植筋率和不同初始静压力对其破坏模式的影响.试验结论为新老混凝土力学性能的研究提供了理论依据.
Thus far,a lot of concrete structures have been aging owing to the rapid development of highways,railways,and the construction industry in China.Concrete structure diseases,such as concrete surface cracks and erosion,require serious consideration due to the effect of long-term use and environmental impact.Some man-made factors have exacerbated these problems,such as insufficient operating level and corners,among others.This has obscured safety risks associated with these concrete structures.However,not all of these structures could not be decommissioned to reduce the negative social and economic impact and to ensure the safety of buildings;therefore,a reasonable approach was to repair and reinforce the old concrete structures.Additionally,in the process of maintenance and reinforcement,planting bars between the new and old concrete must be considered,and especially the corroded planting bar from an aged project that has been terminated.Many studies for the bonding performance of new and old concrete have been conducted by the experts and scholars at home and abroad;thereby,some results have been achieved.Only a few scholars have investigated the bonding performance between new and old concrete with planting bars and especially corroded planting bars from old reconstruction projects that have been terminated.Therefore,investigating the shear performance of new and old concrete with corroded planting bars was of utmost importance.To study the mechanical properties of the interface between new and old concrete with corroded planting bars,the new and old concrete specimens with different planting bar ratios(0%,0.223%,0.446%,0.502%,0.893%,1.004%,1.396%,1.786%,and 2.792%) were prepared based on the corroded planting bars.These corroded planting bars came from the tunnel lining structure of a project that had been terminated for over five years.Shear tests were conducted for new and old concrete under different initial static pressures(0-4 MPa) in an RYL-600 microcomputer control servo rock shear rheometer.The evolution law of the deformation and destruction of new and old concrete specimens under the action of external forces was obtained through summarizing the shear stresses and displacement curves of the specimens.The law of shear strength along with the variation of the steel planting ratio,as well as the initial pressure,were acquired by analyzing the shear strength of the new and old concrete interface with corroded planting bars.Moreover,the influence of different planting bar ratios and the initial pressure on the failure mode of concrete specimens was analyzed emphatically based on specimen failure results.The test results provided the theoretical basis for investigating the mechanical performance of new and old concrete.
Thus far,a lot of concrete structures have been aging owing to the rapid development of highways,railways,and the construction industry in China.Concrete structure diseases,such as concrete surface cracks and erosion,require serious consideration due to the effect of long-term use and environmental impact.Some man-made factors have exacerbated these problems,such as insufficient operating level and corners,among others.This has obscured safety risks associated with these concrete structures.However,not all of these structures could not be decommissioned to reduce the negative social and economic impact and to ensure the safety of buildings;therefore,a reasonable approach was to repair and reinforce the old concrete structures.Additionally,in the process of maintenance and reinforcement,planting bars between the new and old concrete must be considered,and especially the corroded planting bar from an aged project that has been terminated.Many studies for the bonding performance of new and old concrete have been conducted by the experts and scholars at home and abroad;thereby,some results have been achieved.Only a few scholars have investigated the bonding performance between new and old concrete with planting bars and especially corroded planting bars from old reconstruction projects that have been terminated.Therefore,investigating the shear performance of new and old concrete with corroded planting bars was of utmost importance.To study the mechanical properties of the interface between new and old concrete with corroded planting bars,the new and old concrete specimens with different planting bar ratios(0%,0.223%,0.446%,0.502%,0.893%,1.004%,1.396%,1.786%,and 2.792%) were prepared based on the corroded planting bars.These corroded planting bars came from the tunnel lining structure of a project that had been terminated for over five years.Shear tests were conducted for new and old concrete under different initial static pressures(0-4 MPa) in an RYL-600 microcomputer control servo rock shear rheometer.The evolution law of the deformation and destruction of new and old concrete specimens under the action of external forces was obtained through summarizing the shear stresses and displacement curves of the specimens.The law of shear strength along with the variation of the steel planting ratio,as well as the initial pressure,were acquired by analyzing the shear strength of the new and old concrete interface with corroded planting bars.Moreover,the influence of different planting bar ratios and the initial pressure on the failure mode of concrete specimens was analyzed emphatically based on specimen failure results.The test results provided the theoretical basis for investigating the mechanical performance of new and old concrete.
引文
[1]Tian W L,Zhao Z F,Zhao G F,et al.The reseavch summarization on the mechanism of adherence of young concret to the old and its test method.J Hebei Inst Technol,1998,20(1):84(田稳苓,赵志方,赵国藩,等.新老混凝土的黏结机理和测试方法研究综述.河北理工学院学报,1998,20(1):84)
[2]Zhao Z F,Zhao G F,Liu J,et al.Experimental study on adhesive tensile performance of young on old concrete.J Build Struct,2001,22(2):51(赵志方,赵国藩,刘健,等.新老混凝土黏结抗拉性能的试验研究.建筑结构学报,2001,22(2):51)
[3]Cheng H Q,Liu G L,Gao D Y.Experimental study on bonding shear performance of new steel fiber reinforced concrete to old concrete.J Hydroelectr Eng,2013,32(4):177(程红强,刘国龙,高丹盈.钢纤维混凝土与老混凝土黏结剪切性能试验研究.水力发电学报,2013,32(4):177)
[4]Xiao J Z,Xie H,Yang Z J.Shear transfer across a crack in recycled aggregate concrete.Cem Concr Res,2012,42(5):700
[5]Li G Y.A new way to increase the long-term bond strength of newto-old concrete by the use of fly ash.Cem Concr Res,2003,33(6):799
[6]Julio E N B S,Branco F A B,Silva V D.Concrete-to-concrete bond strength:influence of the roughness of the substrate surface.Constr Build Mater,2004,18(9):675
[7]Jin L N,Wang S S,Ren Q W,et al.Experimental study of shear performance of new-to-old concrete interface.J Exp Mech,2014,29(5):611(靳利娜,王山山,任青文,等.新老混凝土结合面抗剪性能试验研究.实验力学,2014,29(5):611)
[8]Pan C Y,Shi X F,Zhou K P.Study on shear strength of new and old concrete bonding interface.J Transp Sci Eng,2014,30(2):6(潘传银,石雪飞,周可攀.新、老混凝土黏结抗剪强度试验.交通科学与工程,2014,30(2):6)
[9]Sun H,Qian Y J.Test analysis of shear performance for the young-old concrete interface between bonded rebar and grooving.Concrete,2012(6):7(孙昊,钱永久.植筋与开槽的新老混凝土结合面抗剪性能试验分析.混凝土,2012(6):7)
[10]Wang J,Morikawa H,Kawaguchi T.Experimental and analytical investigations of bonding ultrahigh strength fibre concrete panels on reinforced concrete structures with low concrete strength.Mag Concr Res,2015,67(24):1329
[11]Iskhakov I,Ribakov Y,Holschemacher K,et al.High performance repairing of reinforced concrete structures.Mater Des,2013,44:216
[12]Mechtcherine V.Novel cement-based composites for the strengthening and repair of concrete structures.Constr Build Mater,2013,41:365
[13]Long G C,Xie Y J,Ding W W,et al.Ion-transport characteristics of new-old concrete composite system.J Cent South Univ,2014,21(2):790
[14]Diab A M,Elmoaty A E M A,Eldin M R T.Slant shear bond strength between self-compacting concrete and old concrete.Constr Build Mater,2017,130:73
[15]Clímaco J C T S,Regan P E.Evaluation of bond strength between old and new concrete in structural repairs.Mag Concr Res,2001,53(6):377
[16]Pandey A K.Factors affecting bond between new and old concrete.ACI Mater J,2012,109(3):389
[17]Behfarnia K,Jon-nesari H,Mosharaf A.The bond between repair materials and concrete substrate in marine environment.Asian J Civil Eng(Build Hous),2005,6(4):267
[18]General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,Standardization Administration of the People's Republic of China.GB 1499.2—2007 Steel for the Reinforcement of Concrete-Part 2:Hot Rolled Ribbed Bars.Beijing:Standards Press of China,2007(中华人民共和国国家质量监督检验检疫总局,中国国家标准管理委员会.GB 1499.2—2007钢筋混凝土用钢第2部分热轧带肋钢筋.北京:中国标准出版社,2007)
[19]Ministry of Housing and Urban-Rural Development,People's Republic of China,General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China.GB/T 50081—2002 Standard for Test Method of Mechanical Properties on Ordinary Concrete.Beijing:China Building Industry Press,2003(中华人民共和国建设部,国家质量监督检验检疫总局.GB/T 50081—2002普通混凝土力学性能试验方法标准.北京:中国建筑工业出版社,2003)
[20]Ministry of Housing and Urban-Rural Development,People's Republic of China,General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China.GB/T 50107—2010 Standard for Evaluation of Concrete Compressive Strength.Beijing:China Building Industry Press,2010(中华人民共和国住房与城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB/T 50107—2010混凝土强度检验评定标准.北京:中国建筑工业出版社,2010)
[2]Zhao Z F,Zhao G F,Liu J,et al.Experimental study on adhesive tensile performance of young on old concrete.J Build Struct,2001,22(2):51(赵志方,赵国藩,刘健,等.新老混凝土黏结抗拉性能的试验研究.建筑结构学报,2001,22(2):51)
[3]Cheng H Q,Liu G L,Gao D Y.Experimental study on bonding shear performance of new steel fiber reinforced concrete to old concrete.J Hydroelectr Eng,2013,32(4):177(程红强,刘国龙,高丹盈.钢纤维混凝土与老混凝土黏结剪切性能试验研究.水力发电学报,2013,32(4):177)
[4]Xiao J Z,Xie H,Yang Z J.Shear transfer across a crack in recycled aggregate concrete.Cem Concr Res,2012,42(5):700
[5]Li G Y.A new way to increase the long-term bond strength of newto-old concrete by the use of fly ash.Cem Concr Res,2003,33(6):799
[6]Julio E N B S,Branco F A B,Silva V D.Concrete-to-concrete bond strength:influence of the roughness of the substrate surface.Constr Build Mater,2004,18(9):675
[7]Jin L N,Wang S S,Ren Q W,et al.Experimental study of shear performance of new-to-old concrete interface.J Exp Mech,2014,29(5):611(靳利娜,王山山,任青文,等.新老混凝土结合面抗剪性能试验研究.实验力学,2014,29(5):611)
[8]Pan C Y,Shi X F,Zhou K P.Study on shear strength of new and old concrete bonding interface.J Transp Sci Eng,2014,30(2):6(潘传银,石雪飞,周可攀.新、老混凝土黏结抗剪强度试验.交通科学与工程,2014,30(2):6)
[9]Sun H,Qian Y J.Test analysis of shear performance for the young-old concrete interface between bonded rebar and grooving.Concrete,2012(6):7(孙昊,钱永久.植筋与开槽的新老混凝土结合面抗剪性能试验分析.混凝土,2012(6):7)
[10]Wang J,Morikawa H,Kawaguchi T.Experimental and analytical investigations of bonding ultrahigh strength fibre concrete panels on reinforced concrete structures with low concrete strength.Mag Concr Res,2015,67(24):1329
[11]Iskhakov I,Ribakov Y,Holschemacher K,et al.High performance repairing of reinforced concrete structures.Mater Des,2013,44:216
[12]Mechtcherine V.Novel cement-based composites for the strengthening and repair of concrete structures.Constr Build Mater,2013,41:365
[13]Long G C,Xie Y J,Ding W W,et al.Ion-transport characteristics of new-old concrete composite system.J Cent South Univ,2014,21(2):790
[14]Diab A M,Elmoaty A E M A,Eldin M R T.Slant shear bond strength between self-compacting concrete and old concrete.Constr Build Mater,2017,130:73
[15]Clímaco J C T S,Regan P E.Evaluation of bond strength between old and new concrete in structural repairs.Mag Concr Res,2001,53(6):377
[16]Pandey A K.Factors affecting bond between new and old concrete.ACI Mater J,2012,109(3):389
[17]Behfarnia K,Jon-nesari H,Mosharaf A.The bond between repair materials and concrete substrate in marine environment.Asian J Civil Eng(Build Hous),2005,6(4):267
[18]General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,Standardization Administration of the People's Republic of China.GB 1499.2—2007 Steel for the Reinforcement of Concrete-Part 2:Hot Rolled Ribbed Bars.Beijing:Standards Press of China,2007(中华人民共和国国家质量监督检验检疫总局,中国国家标准管理委员会.GB 1499.2—2007钢筋混凝土用钢第2部分热轧带肋钢筋.北京:中国标准出版社,2007)
[19]Ministry of Housing and Urban-Rural Development,People's Republic of China,General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China.GB/T 50081—2002 Standard for Test Method of Mechanical Properties on Ordinary Concrete.Beijing:China Building Industry Press,2003(中华人民共和国建设部,国家质量监督检验检疫总局.GB/T 50081—2002普通混凝土力学性能试验方法标准.北京:中国建筑工业出版社,2003)
[20]Ministry of Housing and Urban-Rural Development,People's Republic of China,General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China.GB/T 50107—2010 Standard for Evaluation of Concrete Compressive Strength.Beijing:China Building Industry Press,2010(中华人民共和国住房与城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB/T 50107—2010混凝土强度检验评定标准.北京:中国建筑工业出版社,2010)