缺陷混凝土抗氯离子渗透性能试验研究
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摘要
对4组配合比的混凝土试件进行多向劈拉试验.利用数字散斑分析技术对其多向劈拉下的微裂纹扩展规律进行分析研究,建立损伤参量——微裂纹损伤面积ω和弹性模量损伤变量DE;同时进行混凝土试件劈拉前后的饱盐混凝土电导率法(NEL法)氯离子渗透性试验,探讨微裂纹损伤场对混凝土氯离子渗透性的影响.结果表明:微裂纹损伤对低水胶比混凝土的渗透性影响更大;随着弹性模损伤变量DE值的增加,氯离子扩散系数变化率β呈现线性递增的趋势,并近似拟合得到二者的关系式;水泥浆的强度、骨料的级配、孔隙率的大小以及损失场的确定等因素都会对氯离子渗透性能产生影响.
Four groups of concrete specimens of different dimension were splitted in the test.The displacements of the concrete specimen surface were analyzed through DSCM(digital speckle correlation method).Furthermore,damage parameters,damage area based on the MCOD(micro-crack opening displacement)and damage variable DE based on the weighting-damping elastic modulus,were determined.At the same time,Cl-permeation of concrete specimens before and after the splitting test were all studied by NEL method,and the influences of micro-crack damage on the Cl-permeability were discussed.The test results show that there are more affection for micro-crack damage on the concrete permeation in the low waterbinder ratio of concrete than the high ones;there is a increasing relationship between damage variable DE based on the damping elastic modulus and change rate of Cl-diffusion coefficients;strength of cement paste,different aggregate gradation,varied porosity,uncertain damage area and so on have significant impacts on Cl-permeability of concrete.
Four groups of concrete specimens of different dimension were splitted in the test.The displacements of the concrete specimen surface were analyzed through DSCM(digital speckle correlation method).Furthermore,damage parameters,damage area based on the MCOD(micro-crack opening displacement)and damage variable DE based on the weighting-damping elastic modulus,were determined.At the same time,Cl-permeation of concrete specimens before and after the splitting test were all studied by NEL method,and the influences of micro-crack damage on the Cl-permeability were discussed.The test results show that there are more affection for micro-crack damage on the concrete permeation in the low waterbinder ratio of concrete than the high ones;there is a increasing relationship between damage variable DE based on the damping elastic modulus and change rate of Cl-diffusion coefficients;strength of cement paste,different aggregate gradation,varied porosity,uncertain damage area and so on have significant impacts on Cl-permeability of concrete.
引文
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[2]SAMAHA H R,HOVER K C.Influence of microcracking on mass transport properties of concrete[J].ACI Materials Journal,1992,89(4):416-424.
[3]WANG Kejin,JANSEN D C,SHAH S P,et al.Permeability study of cracked concrete[J].Cement and Concrete Research,1997,27(3):381-393.
[4]易成.力学损伤对混凝土与纤维混凝土抗渗性能的影响研究[D].北京:中国矿业大学,2002.YI Cheng.Effects study of mechanical damage on permeability of concrete and fiber reinforced concrete[D].Beijing:China University of Mining and Technology,2002.(in Chinese)
[5]ALDEA C M,SHAN S P,KARR A.Permeability of cracked concrete[J].Materials and Structures,1999,32(5):370-376.
[6]ALDEA C M,SHAN S P.Effect of cracking on water and chloride permeability of concrete[J].Materials in Civil Engineer,1999,11(3):181-187.
[7]FRANCOIS R,MASO J C.Effect of damage in reinforced concrete on carbonation or chloride penetration[J].Cement and Concrete Research,1988,18(6):961-970.
[8]刘燕,易成,郭婷婷,等.损伤对混凝土氯离子渗透性能影响的实验研究[J].混凝土,2008(10):1-4.LIU Yan,YI Cheng,GUO Tingting,et al.Experimental studyon the effects of damage on the chloridion permeability of concrete[J].Concrete,2008(10):1-4.(in Chinese)
[9]刘良林,王全凤,沈章春.基于损伤的累积滞回耗能与延性系数[J].地震,2008,12(6):28-32.LIU Lianglin,WANG Quanfeng,SHEN Zhangchun.Study on accumulated dissipated hysteretic energy and ductility index based on damage[J].Earthquake,2008,12(6):28-32.(in Chinese)
[10]刁波,李淑春,叶英华.反复荷载作用下混凝土异形柱结构累积损伤分析及试验研究[J].建筑结构学报,2008,29(1):57-63.DIAO Bo,LI Shuchun,YE Yinghua.Analysis and experiment of cumulated damage of RC structures with special columns under cyclic loading[J].Journal of Building Structures,2008,29(1):57-63.(in Chinese)
[11]谢和平,鞠杨,董毓利.经典损伤定义中“弹性模量法”探讨[J].力学与实践,1997,19(2):1-5.XIE Heping,JU Yang,DONG Shuli.Discussion on the elastic modulus in the classical damage definition[J].Mechanics in Engineering,1997,19(2):1-5.(in Chinese)
[12]赵铁军.混凝土渗透性[M].北京:科学出版社,2006:114-118.ZHAO Tiejun.Permeability of concrete[M].Beijing:Science Press,2006:114-118.(in Chinese)
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