喷射UHTCC与混凝土界面的Ⅱ型断裂试验研究
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摘要
使用喷射超高韧性水泥基复合材料(Ultra High Toughness Cementitious Composites,UHTCC)加固和修补水工混凝土结构具有广阔的应用前景。为评估加固效果,采用喷射UHTCC和既有混凝土制备成的两端无切口剪切型断裂复合试件,开展单边加载剪切型断裂试验,测试两种材料的界面剪切型断裂韧度。对既有混凝土表面分别采用高压水枪冲洗、人工凿毛和涂抹界面剂三种不同的处理方法,并对比研究喷射UHTCC和浇筑UHTCC两种施工工艺,探究不同因素对复合试件界面剪切型断裂韧度的影响。试验结果表明:喷射UHTCC与既有混凝土之间黏结性能良好;界面粗糙度对界面剪切型断裂韧度无显著影响;涂抹界面剂会使界面剪切型断裂韧度显著下降;喷射UHTCC制备的复合试件其界面剪切型断裂韧度高于浇筑UHTCC制备的复合试件。喷射UHTCC技术可对水工混凝土结构进行有效的加固和修复。
The use of sprayable Ultra High Toughness Cementitious Composites(UHTCC for short) to reinforce and repair hydraulic structure has broad prospects. In order to evaluate the effect of strengthening,anexperimental study on shear-mode fracture has been carried out by using the composite specimens of dou-ble-edge unnotched and shear-mode. The existing concrete interfaces are treated respectively by high-pres-sure water washing,artificial chiseling and plastering interfacial agent,to study the impact of different fac-tors on interface fracture toughness of bonding interface between sprayable UHTCC and concrete. Two construction technologies of spraying UHTCC and casting UHTCC are studied. The results of experiments showthat the bonding properties between sprayable UHTCC and existing concrete is satisfactory; the interfaceroughness has no significant effect on interface fracture toughness;plastering interfacial agent can make theinterface fracture toughness decreased significantly; the interface fracture toughness of composite specimensusing sprayable UHTCC is better than using casted UHTCC. The sprayable UHTCC technique is suitablefor the streng thening and repair of hydraulic concrete structures.
The use of sprayable Ultra High Toughness Cementitious Composites(UHTCC for short) to reinforce and repair hydraulic structure has broad prospects. In order to evaluate the effect of strengthening,anexperimental study on shear-mode fracture has been carried out by using the composite specimens of dou-ble-edge unnotched and shear-mode. The existing concrete interfaces are treated respectively by high-pres-sure water washing,artificial chiseling and plastering interfacial agent,to study the impact of different fac-tors on interface fracture toughness of bonding interface between sprayable UHTCC and concrete. Two construction technologies of spraying UHTCC and casting UHTCC are studied. The results of experiments showthat the bonding properties between sprayable UHTCC and existing concrete is satisfactory; the interfaceroughness has no significant effect on interface fracture toughness;plastering interfacial agent can make theinterface fracture toughness decreased significantly; the interface fracture toughness of composite specimensusing sprayable UHTCC is better than using casted UHTCC. The sprayable UHTCC technique is suitablefor the streng thening and repair of hydraulic concrete structures.
引文
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[18]徐世烺,周斌,李庆华,等.喷射超高韧性水泥基复合材料的力学性能研究[J].水利学报,2015,46(5):619-625.
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[25]REINHARDT H W,XU S.Experimental determination of KIICof normal strength concrete[J].Materials&Structures,1998,31(5):296-302.
[26]REINHARDT H W,XU S.A practical testing approach to determine mode II fracture energy GIIF for concrete[J].International Journal of Fracture,2000,105(2):107-125.
[27]高洪波.混凝土Ⅰ型、Ⅱ型断裂参数确定的研究[D].大连:大连理工大学,2008.
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[30]HUTCHINSON J W,SUO Z.Mixed mode cracking in layered materials[J].Advances in Applied Mechanics,1991,29(8):63-191.
[31]赵志方,赵国藩.采用高压水射法处理新老混凝土粘结面的实验研究[J].大连理工大学学报,1999(4):558-561.
[32]袁群,刘健.新老混凝土粘结的剪切强度研究[J].建筑结构学报,2001,22(2):46-50.
[33]王楠,徐世烺.超高韧性水泥基复合材料与既有混凝土黏结性能[J].建筑材料学报,2011,14(3):317-323.
[34]韩菊红,赵国藩,张雷顺.新老混凝土粘结面断裂性能实验研究[J].土木工程学报,2003,36(6):31-35.
[35]程红强,刘国龙,高丹盈.钢纤维混凝土与老混凝土粘结剪切性能实验研究[J].水力发电学报,2013,32(4):177-181.
[2]万墨林,韩继云.混凝土结构加固技术[M].北京:中国建筑工业出版社,1995.
[3]胡少伟,王承强.混凝土大坝结构修复加固新技术——分析与应用[J].水利学报,2007,38(S1):70-75.
[4]邢林生,谭秀娟.我国水电站大坝安全状况及修补处理综述[J].大坝与安全,2001(5):4-8.
[5]师国杰.缺陷修复技术在水工混凝土中的应用[J].山西建筑,2007,33(36):150-151.
[6]李伟,冯春花,李东旭.水工混凝土结构裂纹修补加固材料的研究进展[J].材料导报,2012,26(7):136-140.
[7]陈润锋,张国防,顾国芳.我国合成纤维混凝土研究与应用现状[J].建筑材料学报,2001,4(2):167-173.
[8]张亚坤,侯黎黎.纤维混凝土在水利工程中的应用[J].长江科学院院报,2012,29(10):114-117.
[9]梅明荣,杨勇,王山山,等.钢纤维混凝土热性能及其防裂作用的研究[J].水利学报,2007,38(S1):116-122.
[10]田稳苓,黄承逵.新型抗裂防渗水工混凝土基本性能及其配筋压力管研究[J].水利学报,2002(1):40-46.
[11]徐世烺,李贺东.超高韧性水泥基复合材料研究进展及其工程应用[J].土木工程学报,2008,41(6):13.
[12]WANG S,WU C,LI V C.Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite(PVA-ECC)[J].ACI Materials Journal,2001,98(6):483-492.
[13]徐世烺,李庆华.超高韧性水泥基复合材料在高性能建筑结构中的基本应用[M].北京:科学出版社,2010.
[14]KONG H J,KIM Y Y.Design of engineered cementitious composite suitable for wet-mixture shotcreting[J].ACI Materials Journal,2003,100(6):511-518.
[15]KANDA T,SAITO T,SAKATA N,et al.Tensile and anti-spalling properties of direct sprayed ECC[J].Journal of Advanced Concrete Technology,2003,1(3):269-282.
[16]KOJIMA S,SAKATA N,KANDA T,et al.Application of direct sprayed ECC for retrofitting dam structure surface:Application for Mitaka-Dam[J].Concrete journal,2004,42:135-139.
[17]KUNIEDA M.Recent progress on HPFRCC in Japan[J].Journal of Advanced Concrete Technology,2006,4(1):19-33.
[18]徐世烺,周斌,李庆华,等.喷射超高韧性水泥基复合材料的力学性能研究[J].水利学报,2015,46(5):619-625.
[19]徐世烺.混凝土断裂力学[M].北京:科学出版社,2011.
[20]SWARTZ S E,LU L W,TANG L D,et al.Mode II fracture-parameter estimates for concrete from beam specimens[J].Experimental Mechanics,1988,28(2):146-153.
[21]DAVIES J,MORGAN T G,YIM A W.The finite element analysis of a punch-through shear specimen in mode II[J].International Journal of Fracture,1985,28(1):R3-R10.
[22]DESAYI P.Mode-II fracture of cementitious materials-Part I:Studies on specimens of some new geometries[J].Journal of Structural Engineering,1999,26(1):11-18.
[23]TADA H,PARIS P,IRWIN G.The Stress Analysis of Cracks Handbook(second edition)[Z].Paris Productions Incorporated,St.Louis.,1985.
[24]XU S,REINHARDT H W,GAPPOEV M.Mode II fracture testing method for highly orthotropic materials like wood[J].International Journal of Fracture,1996,75(3):185-214.
[25]REINHARDT H W,XU S.Experimental determination of KIICof normal strength concrete[J].Materials&Structures,1998,31(5):296-302.
[26]REINHARDT H W,XU S.A practical testing approach to determine mode II fracture energy GIIF for concrete[J].International Journal of Fracture,2000,105(2):107-125.
[27]高洪波.混凝土Ⅰ型、Ⅱ型断裂参数确定的研究[D].大连:大连理工大学,2008.
[28]SUO Z,HUTCHINSON J W.Interface crack between two elastic layers[J].International Journal of Fracture,1990,43(1):1-18.
[29]SUO Z,HUTCHINSON J W.Sandwich test specimens for measuring interface crack toughness[J].Materials Science&Engineering A,1989,107(107):135-143.
[30]HUTCHINSON J W,SUO Z.Mixed mode cracking in layered materials[J].Advances in Applied Mechanics,1991,29(8):63-191.
[31]赵志方,赵国藩.采用高压水射法处理新老混凝土粘结面的实验研究[J].大连理工大学学报,1999(4):558-561.
[32]袁群,刘健.新老混凝土粘结的剪切强度研究[J].建筑结构学报,2001,22(2):46-50.
[33]王楠,徐世烺.超高韧性水泥基复合材料与既有混凝土黏结性能[J].建筑材料学报,2011,14(3):317-323.
[34]韩菊红,赵国藩,张雷顺.新老混凝土粘结面断裂性能实验研究[J].土木工程学报,2003,36(6):31-35.
[35]程红强,刘国龙,高丹盈.钢纤维混凝土与老混凝土粘结剪切性能实验研究[J].水力发电学报,2013,32(4):177-181.