冻融和碳化交替作用下生态高延性水泥基复合材料的剪切性能
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摘要
针对车辆减速在生态高延性水泥基复合材料桥面无缝连接板内引起的剪应力问题,设计了冻融-碳化交替作用下生态高延性水泥基复合材料的剪切性能试验.首先研究生态高延性水泥基复合材料试块的碳化前沿,然后研究试块的剪切性能.结果表明:随着交替次数的增加,试块的碳化前沿逐渐增加;随着交替次数的增加,试块应力-应变上升段曲线逐渐平缓,弹性模量损伤因子逐渐增加,而剪切应变能损伤因子在交替次数1～3次后增加,在5～15次后降低.因此,在桥面连接板设计中可采用经历15次交替作用后试块的剪切应力-应变曲线.
Aimed at shear problem caused by vehicles deceleration in bridge jointless link slab produced by ecological high ductility cementitious composites( Eco-HDCC),the shear property of EcoHDCC under cyclic effects on the freeze-thaw and carbonation was studied. The carbonation front of Eco-HDCC was determined. Then,the shear performance of Eco-HDCC was investigated. The results show that with the increase of the cycle,the carbonation front of Eco-HDCC increases with a slow speed.In addition,with the increase of the cycle,the ascending shape of the shear stress-strain curve for EcoHDCC is gentler and the shear elastic modulus damage factor shows an increased trend. The shear strain energy damage factor increases after 1 to 3 cycles,and decreases after 5 to 15 cycles. Therefore,the shear stress-strain curve of Eco-HDCC after 15 cycle is adopted in bridge link slab design.
Aimed at shear problem caused by vehicles deceleration in bridge jointless link slab produced by ecological high ductility cementitious composites( Eco-HDCC),the shear property of EcoHDCC under cyclic effects on the freeze-thaw and carbonation was studied. The carbonation front of Eco-HDCC was determined. Then,the shear performance of Eco-HDCC was investigated. The results show that with the increase of the cycle,the carbonation front of Eco-HDCC increases with a slow speed.In addition,with the increase of the cycle,the ascending shape of the shear stress-strain curve for EcoHDCC is gentler and the shear elastic modulus damage factor shows an increased trend. The shear strain energy damage factor increases after 1 to 3 cycles,and decreases after 5 to 15 cycles. Therefore,the shear stress-strain curve of Eco-HDCC after 15 cycle is adopted in bridge link slab design.
引文
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[3]Kang S B,Tan K H,Zhou X H,et al.Experimental investigation on shear strength of engineered cementitious composites[J].Engineering Structures,2017,143:141-151.DOI:10.1016/j.engstruct.2017.04.019.
[4]van Zijl G P A G.Improved mechanical performance:Shear behaviour of strain-hardening cement-based composites(SHCC)[J].Cement and Concrete Research,2007,37(8):1241-1247.DOI:10.1016/j.cemconres.2007.04.009.
[5]张丽辉.生态型高延性水泥基复合材料制备、关键性能及机理研究[D].南京:东南大学,2014.
[6]中交公路规划设计院有限公司.JTG D60-2015公路桥涵设计通用规范[S].北京:人民交通出版社,2015.
[7]Chai L J,Guo L P,Chen B,et al.Interactive effects of freeze-thaw cycle and carbonation on tensile property of ecological high ductility cementitious composites for bridge deck link slab[J].Construction and Building Materials,2018,186:773-781.DOI:10.1016/j.conbuildmat.2018.07.248.
[8]武海荣.混凝土结构耐久性环境区划与耐久性设计方法[D].杭州:浙江大学,2012.Wu H R.Environmental zonation on design methodology for durability of concrete structures[D].Hangzhou:Zhejiang University,2012.(in Chinese)
[9]李浩宇.实验室与自然条件下水工结构混凝土冻融关系研究[D].长春:长春工程学院,2015.Li H Y.Study on the relationship between the lab and natural conditions of hydraulic structure concrete freezing and thawing[D].Changchun:Changchun Institute of Technology,2015.(in Chinese)
[10]中华人民共和国住房和城乡建设部.GB/T 50082-2009普通混凝土长期性能和耐久性能试验方法标准[S].北京:中国建筑工业出版社,2009.
[11]中华人民共和国住房和城乡建设部.GB/T 50081-2002普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2002.
[12]中国中材国际工程股份有限公司.JC/T 2461-2018高延性纤维增强水泥基复合材料力学性能试验方法[S].北京:中国建材工业出版社,2018.
[13]马瑞,郭丽萍,谌正凯,等.超高性能钢纤维水泥基复合材料-高延性水泥基材料复合梁的制备及弯曲性能[J].东南大学学报(自然科学版),2017,47(2):377-383.DOI:10.3969/j.issn.1001-0505.2017.02.029.Ma R,Guo L P,Chen Z K,et al.Preparation and bending properties of coupled beam made by UHPFRCCand high ductility cementitious composites[J].Journal of Southeast University(Natural Science Edition),2017,47(2):377-383.DOI:10.3969/j.issn.1001-0505.2017.02.029.(in Chinese)
[14]中华人民共和国住房和城乡建设部.GB 50010-2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.