海水侵蚀环境下混凝土力学性能退化模型

基于混凝土干湿循环试验和混凝土细观力学，对混凝土在海水侵蚀环境下力学性能的变化进行了研究。混凝土干湿循环试验方面，采用加速腐蚀试验。对混凝土试件和根据混凝土配比制成的砂浆试件进行0、10、20、30、40、50次干湿循环，利用大型混凝土静、动三轴试验系统，检测了海水侵蚀作用对混凝土抗压强度、抗拉强度、弹性模量及应力-应变关系的影响。依据混凝土细观力学理论，对混凝土试块进行了细观数值模拟，考虑了混凝土各组成相的非均匀性、材料性质按照Weibull分布来赋值。同时，为反映海水侵蚀作用对混凝土的影响，砂浆的强度和弹性模量均以砂浆干湿循环试验所得结果为准，最后建立了混凝土随干湿循环次数变化的抗压强度折减模型，抗拉强度折减模型和弹性模量的折减模型。

Mechanical property deterioration model for concrete in environment with salt solution

Based on the dry-wet cycling experiment of concrete and micromechanics, the study of mechanical properties of concrete in seawater erosion is carried out. In the aspect of dry-wet cycling, by accelerated corrosion test method, the experiment of concrete specimens and mortar specimens which are made according to the ratio of concrete, has been completed after 0, 10, 20, 30, 40 and 50 times dry-wet cycles. Under the influence of seawater erosion on the concrete, its compressive strength is tested, together with the tensile strength of concrete, elastic modulus and stress-strain relationship, using the large static-dynamic triaxial test system for concrete. According to the theory of micromechanics, the concrete test block is numerically simulated on meso-level. Considering various components, the material nature of its components is assigned in accordance with the Weibull distribution. In order to reflect the influence of seawater erosion on the concrete, the strength and elastic ratio of mortar specimens are assigned according to the result of dry-wet cycling experiment. Finally, through the analysis and study of the concrete above all, the compressive strength reduction model, the tensile strength reduction model, and the elastic ratio reduction model, are determined with the change in the number of dry-wet circle.