基于损伤场的混凝土氯离子渗透性研究  

Study on Cl- penetration resistance of concrete based on damage fields

作　　者：刘燕[1] 易成[2] 

机构地区：[1]河北农业大学城乡建设学院,河北保定071001 [2]中国矿业大学(北京)"煤炭资源与安全开采"国家重点实验室,北京100083

出　　处：《混凝土》2014年第4期44-47,共4页Concrete

基　　金：河北省自然科学基金(E2011204034);河北农业大学非生命基金(Fs20100102)

摘　　要：混凝土微裂纹缺陷会对氯离子渗透性能产生一定的影响。通过对混凝土多方位的劈拉试验构建均匀损伤场,同时对损伤前后的混凝土试块进行氯离子渗透试验,研究微裂隙损伤场对混凝土氯离子渗透性能的影响。在劈拉试验中,通过数字散斑技术获得对应不同劈拉方向的MCOD值,建立基于微裂纹损伤面积ω和加权弹模衰减EL值的损伤场变量DE,并进一步分析了该损伤变量与氯离子扩散系数D之间的关系。Micro-crack defects in concrete can affect the Chloride ion permeability of concrete in a certain extent.In the paper, the split-ting experiments of concrete specimens from the four different dimensions are carried out in order to build the even damage fields.The dis- placements of the concrete specimens＇ surface are analyzed through DSCM （Digital Speckle Correlation Method ）.Therefore damage pa rameters are determined that are damage area o） based on the MCOD（Micro-Crack Opening Displacement ） and damage variable DE based on the weighting-damping elastic modulus.At the same time, Cl^- permeation of concrete specimens before and after the splitting test are studied by NEL method, and Cl^- diffusion coefficients D are recorded in detail.Further relationships between damage parameters and diffu-sion coefficients of Cl^- are discussed.

关 键 词：多向加载 损伤场 数字散斑方法 氯离子扩散系数 

分 类 号：TU528.01[建筑科学—建筑技术科学]