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混凝土的材料组成、养护条件以及工作环境等因素对其耐久性有显著影响。为研究这些因素对混凝土抗氯盐侵蚀性能的影响程度,基于混凝土氯盐侵蚀检测数据库,对表观氯离子扩散系数进行时变性分析;引入多重环境时间相似理论,采用回归、拟合等方法获得暴露环境影响系数ke、粉煤灰用量影响系数kFA、矿渣用量影响系数kSL、水胶比影响系数kW/B及养护影响参数kc的拟合式。研究结果表明:水下区对表观氯离子扩散系数有明显的放大效应,浪溅区对表观氯离子扩散系数有缩小作用;水胶比为0.25时混凝土中电迁移系数DRCM约为水胶比为0.35时的70%;粉煤灰用量占胶凝材料总量的25%时DRCM可比普通混凝土中降低约40%,矿渣用量为40%时电迁移系数降幅约25%;不养护条件下表观氯离子扩散系数约为充分养护条件下的2倍。利用上述影响系数,建立了表观氯离子扩散系数和电迁移系数之间的转换关系。
Concrete material composition, curing conditions and work environment and other factors have a significant impact on its durability. In order to study the influence of these factors on the corrosion resistance of concrete, the chloride ion diffusion coefficient of the concrete was analyzed based on the database of chloride salt erosion. The time-dependent analysis of apparent chloride diffusion coefficient was carried out. The environmental impact coefficient ke, the influence coefficient of fly ash dosage kFA, the influence coefficient of slag dosage kSL, the influence coefficient of water glue ratio kW / B and the conservation influence parameter kc. The results show that the underwater area has a significant amplification effect on the apparent chloride ion diffusion coefficient, the splash zone has a diminishing effect on the apparent chloride ion diffusion coefficient, and the electrocatalysis coefficient DRCM in the concrete with a water / Ratio of 0.35 when 70%; amount of fly ash accounted for 25% of the total amount of cementitious material DRCM can be reduced by about 40% compared to ordinary concrete, the amount of 40% slag reduced electromigration coefficient of about 25%; not curing conditions Apparent chloride ion diffusion coefficient is about twice as long as under full curing conditions. Using the above influence coefficient, the conversion relation between apparent chloride ion diffusion coefficient and electromigration coefficient was established.