海洋生物膜对混凝土耐久性影响

The Effect of Marine Biofilms on Concrete Durability

为研究海洋生物群落附着在混凝土表面形成生物膜对混凝土耐久性能的影响,设置对照实验组,制作标准试块,放置在相应海洋环境中进行侵蚀,分阶段取出试块进行实验,检测混凝土碳化深度,氯离子侵蚀深度以及混凝土扩散系数三个参数,其中将有活性的生物膜,无活性的生物膜及无生物膜试块的混凝土氯离子扩散系数进行对比。有活性的海洋生物膜对混凝土碳化及氯离子侵蚀起到一定的抑制作用。为桥梁养护提供新的方法建议。采用MATLAB较好的拟合有生物膜与无生物膜扩散系数的关系,以便基于现有氯离子扩散系数模型推测有生物膜的氯离子扩散模型。

In order to study the effect of attached biofilm form from the marine biological on concrete impermeability, the control experimental groups are set, the standard test blocks are made and placed in the appropriate marine environment for erosion. Blocks are taken out from each phase and be tested, three parameters are detected, including carbonation depth, chloride ion erosion depth and concrete diffusivity. And the concrete chloride ion diffusion coefficients of blocks with inactive biofilm, biofilm and none biofilm are contrasted. It is found that the active marine biofilm can prevent the concrete from car- bonizing and eroding by chloride ion, which provides a new method and proposal for bridge maintenance. MATLAB can bet- ter fit the relation of diffusion coefficients of biofilm ones and the none biofilm ones. The chloride ion diffusion model with biofilm can be predicted based on the existing diffusion coefficient model of chloride ion.