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首页> 外文期刊>Cement and Concrete Research >Sodium silicate-based alkali-activated slag mortars Part II. The retarding effect of additions of sodium chloride or malic acid
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Sodium silicate-based alkali-activated slag mortars Part II. The retarding effect of additions of sodium chloride or malic acid

机译：硅酸钠基碱活化矿渣砂浆第二部分。添加氯化钠或苹果酸的阻滞作用

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摘要

In this paper we investigate the hydration of alkali-activated slag cements in the presence of heavy contamination with chloride (up to 13 percent by weight as NaCl with respect to slag). Reference samples were made by activating slag with sodium silicate solution. Companion samples in which a high level of sodium chloride was added to the mix water were found, based on strength development and calorimetry, to be severely retarded. When the known retarder malic acid was also added to the mixes, the mix that also contained sodium chloride showed no significant heat development in the first 10 days. Pore expression experiments indicated that the bulk of the chloride remained dissolved in the pore solution. XRD indicated that no new crystalline hydrates were formed when NaCl was added to the system. In the systems with added malic acid or sodium chloride, the same calorimetry peaks were observed, albeit retarded, but with similar integrated heat outputs, suggesting that the basic mechanism of hydration was not altered by the retarding additions.
机译：在本文中，我们研究了在重度氯化物（相对于炉渣，按重量计，NaCl含量最高为13％）存在的情况下，碱活化矿渣水泥的水化作用。参考样品是通过用硅酸钠溶液活化炉渣制成的。根据强度发展和量热法，发现向混合水中添加了大量氯化钠的同伴样品受到严重阻碍。当还向混合物中添加已知的缓凝剂苹果酸时，也包含氯化钠的混合物在开始的10天中没有显示出明显的热量发展。孔隙表达实验表明，大部分氯化物仍溶解在孔隙溶液中。 XRD表明，当将NaCl添加到系统中时，没有形成新的结晶水合物。在添加苹果酸或氯化钠的系统中，观察到了相同的量热峰，尽管有所延迟，但具有相似的综合热量输出，这表明延迟添加不会改变水合的基本机理。

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