微细钢纤维快硬高强硫铝酸盐水泥砂浆与钢筋黏结性能研究
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摘要
利用硫铝酸盐水泥的快硬早强和微细钢纤维的增强、增韧等特性,配制快硬高强的微细钢纤维水泥砂浆,通过局部黏结中心拔出试验,研究对拉和单向2种方式下其与钢筋的黏结-滑移性能,最后拟合了吻合度较好的黏结-滑移本构关系式。研究表明:2,3,24h龄期的基体抗压强度和与螺纹钢筋黏结强度分别达29. 47,30. 80,81. 45MPa和21. 12,23. 07,30. 00MPa,基体和黏结的早强性能良好;黏结强度比基体抗压强度发展更快;材料适于抢修加固工程。局部黏结单向拉拔试验中,与钢筋黏结的破坏模式为劈裂和延性破坏。中心对拉试验较单向拉拔试验的黏结强度低,钢筋破坏方式为拔出和延性破坏,当只能采用此方式进行抢修加固时,需采用对应的试验测得其黏结强度。
The fast hardening high strength mortar was prepared by using the sulphoaluminate cement with early strength and the micro-steel-fiber. Through the test of partially bonded center pulling out,the bondslip performance between the steel bar and micro-steel-fiber reinforced fast hardening high strength sulphoaluminate cement mortar was experimentally investigated. Additionally,the bond-slip constitutive relation with good fit was fitted. Main conclusions showed that the compressive strength and the bond strength of the sulphoaluminate cement mortar reinforced by micro steel fiber and steel rebar at curing age of 2,3,24 h were 29. 47,30. 80,81. 45 MPa and 21. 12,23. 07,30. 00 MPa,respectively. The bond strength of the specimens with the steel bars increased more than the increasing of compressive strength of the matrix. For the test of partially bonded pulling out,the failure mode of bond with steel bars was splitting and ductile destruction. The bond strength of the center pulling out test was lower than the bond strength of the unidirectional pulling out test. The destruction mode was pulling out and ductile destruction. It is necessary to use the test method for the corresponding method of the repair to measure the bond strength.
The fast hardening high strength mortar was prepared by using the sulphoaluminate cement with early strength and the micro-steel-fiber. Through the test of partially bonded center pulling out,the bondslip performance between the steel bar and micro-steel-fiber reinforced fast hardening high strength sulphoaluminate cement mortar was experimentally investigated. Additionally,the bond-slip constitutive relation with good fit was fitted. Main conclusions showed that the compressive strength and the bond strength of the sulphoaluminate cement mortar reinforced by micro steel fiber and steel rebar at curing age of 2,3,24 h were 29. 47,30. 80,81. 45 MPa and 21. 12,23. 07,30. 00 MPa,respectively. The bond strength of the specimens with the steel bars increased more than the increasing of compressive strength of the matrix. For the test of partially bonded pulling out,the failure mode of bond with steel bars was splitting and ductile destruction. The bond strength of the center pulling out test was lower than the bond strength of the unidirectional pulling out test. The destruction mode was pulling out and ductile destruction. It is necessary to use the test method for the corresponding method of the repair to measure the bond strength.
引文
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[7]冯玲.微细钢纤维高强混凝土[D].郑州:郑州大学,2011.
[8]冯虎,赵昆鹏,周博文,等.微细钢纤维快硬高强混凝土弯曲性能试验[J].土木工程与管理学报,2017,34(2):56-59.
[9] GARCIA-TAENGUA E, MART-VARGAS J R, SERNA P.Bond of reinforcing bars to steel fiber reinforced concrete[J].Construction&building materials,2016,105:275-284.
[10]李琛.钢纤维纳米混凝土与钢筋黏结滑移本构关系[D].郑州:郑州大学,2015.
[2] KURYANTNYK T,CHABANNET M,AMBROISE J,et al.Leaching behaviour of mixtures containing plaster of Paris and calcium sulphoaluminate clinker[J]. Cement and concrete research,2010,40(8):1149-1156.
[3] KURYANTNYK T,CHABANNET M,AMBROISE J,et al.Improvement of calcium sulphate water resistance by addition of calcium sulphoaluminate clinker[J]. Materials letters,2008,62(21):3713-3715.
[4] PARK C K. Hydration and solidification of hazardous wastes containing heavy metals using modified cementitious materials[J]. Cement and concrete research,2000,30(3):429-435.
[5] SINGH M,KAPUR P C,PRADIP. Preparation of calcium sulphoaluminate cement using fertiliser plant wastes[J]. Journal of hazardous materials,2008,157(1):106-113.
[6] VELAZCO G,ALMANZA J M,CORTES D A,et al. Effect of citric acid and the hemihydrate amount on the properties of a calciumsulphoaluminate cement[J]. Materiales De Construccion,2014,64:1-8.
[7]冯玲.微细钢纤维高强混凝土[D].郑州:郑州大学,2011.
[8]冯虎,赵昆鹏,周博文,等.微细钢纤维快硬高强混凝土弯曲性能试验[J].土木工程与管理学报,2017,34(2):56-59.
[9] GARCIA-TAENGUA E, MART-VARGAS J R, SERNA P.Bond of reinforcing bars to steel fiber reinforced concrete[J].Construction&building materials,2016,105:275-284.
[10]李琛.钢纤维纳米混凝土与钢筋黏结滑移本构关系[D].郑州:郑州大学,2015.