论文部分内容阅读
模拟海洋环境,通过MIP从宏观角度研究混凝土的抗冻性和抗Cl~-渗透性,用渗冻比R评价其综合性能,运用有限元、Comsol Multiphysics软件对混凝土冻融过程进行数值模拟。得到结论:加入硅灰并掺入适量的引气剂可提高抗冻和抗Cl-渗透的综合能力,海洋环境下的混凝土冻融后其总孔隙率大小和最可几孔径大小与R值成反比例,且混凝土掺入硅灰后其抗SO_4~(2-)的穿透能力降低;随着R值增大,表层腐蚀产物数量和种类多而内部较少。数值模拟结果与实验结果近似度较高,说明了MIP方法是合理的。
Simulation of the marine environment, through the MIP macroscopical study of concrete frost resistance and resistance to Cl ~ - permeability, evaluation of its comprehensive performance with the permeability ratio R, the use of finite element method, Comsol Multiphysics software to simulate the freeze-thaw process of concrete. It is concluded that the addition of silica fume and the incorporation of appropriate amount of air entraining agent can improve the comprehensive ability of antifreeze and anti-Cl-infiltration. The total porosity and the most probable pore size of concrete after freezing and thawing in marine environment are as follows: Inverse proportion, and the concrete incorporation of silica fume after the anti-SO_4 ~ (2) penetration decreased; with the R value increases, the number of surface corrosion products and more types of internal and less. The numerical simulation results are highly similar to the experimental results, which shows that the MIP method is reasonable.