设置界面构造锚筋的新老混凝土粘结性能试验研究
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摘要
新老混凝土良好结合是混凝土修补成功的关键,提出设置界面构造锚筋来增强新老混凝土粘结性能,通过采用劈拉试验和剪切试验综合分析有无构造锚筋的新老混凝土试件以及新、老混凝土整体试件的劈拉强度与抗剪强度特性。试验结果表明:无界面构造锚筋时新老混凝土水平粘结面试件的劈拉强度高于具有竖直粘结面的试件;采用构造锚筋的新老混凝土试件比不加锚筋试件的劈拉强度增长了24.1%;采用锚筋的新老混凝土试件的剪切破坏面均发生在结合面处,且试件两个结合面的剪切破坏不是同时产生;采用锚筋试件的剪切强度为无锚筋试件剪切强度的3.49倍,为新混凝土整体剪切试件强度的115.5%;构造锚筋能明显增强新老混凝土粘结性能。
Based on the key factors of bonding properties for interface between young and old concrete,constructional steel bars between interfaces of young and old concrete were adopted to strengthen interfacial bonding properties.Splitting tensile strength and shear strength for young and old concrete bonding samples with and with out steel bars,as well as new and old monolithic samples were analyzed through splitting tests and two-side shear tests.The tests results show that the splitting strength of concrete samples with horizontal interface is generally higher than concrete sample with vertical interface,splitting strength for young and old concrete embedded with steel bars at bonding interface increase 24.1% compared with young and old concrete samples without steel bars.The two failure surfaces caused by shear tests for young and old concrete embedded with steel bars are observed at joint surface,but do not appear simultaneously.The shear strength of young and old concrete embedded with steel bars is 3.49 times of those without steel bars,and can achieve up to 115.5% of the shear strength of new monolithic concrete.
Based on the key factors of bonding properties for interface between young and old concrete,constructional steel bars between interfaces of young and old concrete were adopted to strengthen interfacial bonding properties.Splitting tensile strength and shear strength for young and old concrete bonding samples with and with out steel bars,as well as new and old monolithic samples were analyzed through splitting tests and two-side shear tests.The tests results show that the splitting strength of concrete samples with horizontal interface is generally higher than concrete sample with vertical interface,splitting strength for young and old concrete embedded with steel bars at bonding interface increase 24.1% compared with young and old concrete samples without steel bars.The two failure surfaces caused by shear tests for young and old concrete embedded with steel bars are observed at joint surface,but do not appear simultaneously.The shear strength of young and old concrete embedded with steel bars is 3.49 times of those without steel bars,and can achieve up to 115.5% of the shear strength of new monolithic concrete.
引文
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[2]赵志方,赵国藩,黄承逵.新老混凝土粘结的拉剪性能研究[J].建筑结构学报,1999,20(2):26-31.(ZHAO Zhifang,ZHAO Guofan,HUANG Chengkui.Research on the tension-shear behavior of the adhesionof young and old concrete[J].Journal of BuildingStructures,1999,20(2):26-31.(in Chinese))
[3]赵志方,赵国藩,刘健,等.新老混凝土粘结抗拉性能的试验研究[J].建筑结构学报,2001,22(2):51-56.(ZHAO Zhifang,ZHAO Guofan,LIU Jian,etal.Experimental study on adhesive tensile performanceof young on old concrete[J].Journal of BuildingStructures,2001,22(2):51-56.(in Chinese))
[4]王少波,郭进军,张雷顺,等.界面剂对新老混凝土粘结的剪切性能的影响[J].工业建筑,2001,31(11):35-38.(Wang Shaobo,Guo Jinjun,ZhangLeishun,et al.The effect of interfacial agents on theshear property of bond between new and old concrete[J].Industrial Construction,2001,31(11):35-38.(in Chinese))
[5]管大庆,陈章洪,石韫珠.界面处理对新老混凝土粘结性能的影响[J].混凝土,1994(5):16-22.(Guan Daqing,Chen Zhanghong,Shi Yunzhu.Theeffect of interfacial treatment on adhension properties[J].Concrete,1994(5):16-22.(in Chinese))
[6]Adachi I,Hashimoto K,Nishimura T.Constructionjoint of concrete structures using shot-blasting technique[J].Transaction of the Japan Concrete Institute,1983(5):61-76.
[7]张雷顺,闫国新,张晓磊,等.沟槽式新老混凝土粘结面抗剪强度试验研究[J].郑州大学学报:工学版,2006,27(2):24-28.(Zhang Leishun,YanGuoxin,Zhang Xiaolei,et al.Experimental research onshear strength of interfacial bonding of new and oldconcrete by cutting groove[J].Journal of ZhengzhouUniversity:Engineering Science,2006,27(2):24-28.(in Chinese))
[8]赵晓艳.新老混凝土机械连接结合性能研究[D].天津:河北工业大学,2003.(Zhao Xiaoyan.Study oncombination capability of young and old concret withmechanical joint element[D].Tianjin:HebeiUniversity of Technology,2003.(in Chinese))
[9]Walter E,Meier P.The use of mechanical dowels asbond elements between young and old concrete:adherence of young and old concrete[M].Freiburg:Aediftication Verlag,1994.
[10]GB/T50081—2002普通混凝土力学实验性能实验方法标准[S].(GB/T 50081—2002 Standard fortests of mechanical properties of concrete[S].(inChinese))
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