【摘 要】
：
In this paper, the factors having effects on the penetration behavior of Cl, Cs, K and Na are discussed from the viewpoint of the interactions between the aqueous species and hydrates.It was shown tha
【机 构】
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Central research laboratory, Taiheiyo Cement Corporation, 285-8655, JAPAN
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
In this paper, the factors having effects on the penetration behavior of Cl, Cs, K and Na are discussed from the viewpoint of the interactions between the aqueous species and hydrates.It was shown that the penetration velocity of Cs is significantly faster than K and Na although the Cs is one of the alkali metals as is the case in K and Na.The shape of concentration profile of Cs is also quite different from that of Na and K and consists of a peak shape at inner layer next to surface and a moderate downward slope toward the inside.The peak shape is a common in the alkali metals, however, the downward slope is intrinsic feature of Cs.In the downward slope area, Cs penetrates with being influenced by the-SiOK and-SiONa, which make the penetration depth of Cs coincide with the leaching out depth of Na and K.In addition to the interactions, in the peak shape area, the -SiOH has an effect on the penetration of Cs which may cause the peak shape.When 30% OPC is replaced by fly ash, the penetration depth or leaching out depth of Cl, Cs, K and Na are reduced at a constant rate compared to the case of no replacement.These are derived from the experimental results by the immersion test using chloride salt solution of 0.5 mol/dm3.However, even in the lower concentration (3 x 10-3 mol/dm3), the penetration depths and the shape of profile of Cs and Cl does not change.
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