混凝土渗透性的原位测试与评价

利用离子迁移实验和混凝土表面电阻率两种实验方法原位测试5种钢筋混凝土箱梁保护层混凝土的氯离子扩散系数和混凝土表面电阻率,讨论原位测试结果与实验室里ASTM C1202电通量测量值的相关性,建立保护层混凝土氯离子扩散系数与混凝土表面电阻率之间的数学关系式,利用原位测试的氯离子扩散系数评价了钢筋混凝土箱梁在海洋环境条件中的使用寿命。研究结果表明,在稳态下混凝土结构表面保护层混凝土的氯离子扩散系数和混凝土表面电阻率与6h电通量具有较好的相关性,可以采用离子迁移实验和混凝土表面电阻率两种实验方法进行在原位测试和评价混凝土的渗透性,混凝土表面电阻率在工程应用上更为简便。

In situ testing and evaluation of the permeability of concrete

With Permit ion migration experiments and concrete surface resistivity test the chloride ion diffusion coefficient and the concrete surface resistivity of the five concretes were measured and the relation between in situ results and ASTM C1202 electric flux for 6h in the laboratory were analyzed. The mathematical relationship between a protective layer of concrete chloride ion diffusion coefficient and surface resistivity of concrete was established, and the service life of reinforced concrete beams was calculated by in situ testing results under the marine environment. The results showed that there was good correlation between the concrete surface resistivity of the concrete cover, in the steady state the action of chloride diffusion coefficient and 6 h charge. Permit experiments and the concrete surface resistivity were tested and evaluated the permeability of the concrete in situ, and concrete surface resistivity was easy in engineering applications.