The conventional CaCl2-H2O phase diagram is often used to describe how calcium chloride behaves when it is used on a concrete pavement undergoing freeze-thaw damage. However, the chemistry of the concrete can alter the appropriateness of using the CaCl2-H2O phase diagram. This study shows that the Ca(OH)2 present in a hydrated portland cement can interact with CaCl2 solution creating a behavior that is similar to that observed in isoplethal sections of a ternary phase diagram for a Ca(OH)2-CaCl2-H2O system. As such, it is suggested that such isoplethal sections provide a reasonable model that can be used to describe the behavior of concrete exposed to CaCl2 solution as the temperature changes. Specifically, the Ca(OH)2 can react with CaCl2 and H2O resulting in the formation of calcium oxychloride. The formation of the calcium oxychloride is expansive and can produce damage in concrete at temperatures above freezing. Its formation can also cause a significant decrease in fluid ingress into concrete. For solutions with CaCl2 concentrations greater than about 11.3 % (by mass), it is found that calcium oxychloride forms rapidly and is stable at room temperature (23 °C).

中文翻译：

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氯化钙除冰盐对胶凝材料的相变和损伤发展的影响。

传统的CaCl2-H2O相图通常用于描述氯化钙在冻融损坏的混凝土路面上使用时的行为。但是，混凝土的化学性质会改变使用CaCl2-H2O相图的适当性。这项研究表明，存在于水合硅酸盐水泥中的Ca（OH）2可以与CaCl2溶液相互作用，从而产生类似于在Ca（OH）2-CaCl2-H2O系统三元相图等渗截面中观察到的行为。 。因此，建议等渗截面提供合理的模型，该模型可用于描述随温度变化而暴露于CaCl2溶液的混凝土的行为。具体地，Ca（OH）2可以与CaCl 2和H 2 O反应，导致形成氯氧化钙。氯氧化钙的形成膨胀，在高于冰点的温度下会在混凝土中产生破坏。它的形成也可以导致流体进入混凝土的显着减少。对于CaCl 2浓度大于约11.3％（质量）的溶液，发现氯氧化钙迅速形成，并且在室温（23°C）下稳定。