论文部分内容阅读
用自然扩散法测定了混凝土中的总氯离子和自由氯离子浓度,计算了普通混凝土、粉煤灰混凝土和矿渣混凝土的氯结合能力.研究了矿物掺合料的掺量、暴露时间、养护龄期对混凝土氯结合能力的影响。结果表明;随着矿物掺合料掺量的增大,粉煤灰混凝土氯离子结合能力的变化趋势是先上升后下降,矿渣混凝土的氯离子结合能力则急剧增强;混凝土的氯离子结合能力与暴露的氯盐溶液种类有关,而与暴露时间无关,并且随着混凝土的标准养护龄期的延长而不断增强。因此,对于实际氯盐环境中的混凝土结构,建议采用最佳掺量25%的粉煤灰混凝土或者高掺量矿渣混凝土.同时加强潮湿养护,有利于提高混凝土结构的服役寿命。
The total chloride ion and free chlorine ion concentration in concrete were determined by natural diffusion method, and the chloride binding ability of ordinary concrete, fly ash concrete and slag concrete were calculated.The content of mineral admixture, the exposure time, the curing age Effect of period on chlorine binding capacity of concrete. The results showed that with the increase of the content of mineral admixture, the change trend of chloride ion binding capacity of fly ash concrete firstly increased and then decreased, and the chloride ion binding capacity of slag concrete increased sharply. The chloride ion binding capacity of concrete and The type of chloride salt solution exposed is independent of exposure time and is increasing with the standard curing age of concrete. Therefore, for the concrete structure in the actual chloride environment, it is recommended to use the best dosage of 25% fly ash concrete or high volume of slag concrete, while strengthening wet curing, help to improve the service life of concrete structures.