金凌志1,何 培1,陈宜虎2
不同活性掺合料RPC抗氯离子渗透性能试验研究
金凌志1,何 培1,陈宜虎2
摘 要:为了研究不同活性掺合料的活性粉末混凝土(RPC)在不同养护温度条件下的抗氯离子渗透性能,利用NEL试验法,分别对4组不同温度、不同活性掺合料的RPC试件进行氯离子扩散系数测定。结果表明,RPC优异的微观结构使其具有良好的抗氯离子渗透性能;在相同养护温度下,不同活性掺合料替代硅灰比例相同时,RPC试件抗氯离子渗透能力的大小依次为:粉煤灰>石英砂>微硅粉;同一种活性掺合料替代相同比例硅灰时,高温养护的RPC试件,其抗氯离子渗透性能明显优于常温养护的RPC试件。
Abstract: In order to research the resistance to chloride ion penetration performance of reactive powder concrete(RPC) with different active admixture which works in the condition of different curing temperature, the NEL test method is used to determine the chloride ion diffusion coefficient in four groups which work on different temperature and have different active admixtures. The results show that the RPC has good properties of the resistance to chloride ion permeability because of its excellent microscopic structure. The order of the RPC specimens’ ability to resist chloride ion permeability is that: fly ash > quartz sand> silica fume which work in the same curing temperature and have the same ratio of these three active admixtures. For the same kind of active admixtures, the ability of the resistance to chloride ion permeability when the RPC specimens are cured in high temperature is better than other specimens’ when they are cured in normal temperature.
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