The major crystalline phases in magnesium oxychloride cement (MOC) have been extensively studied, but the other phases have not been studied due to the difficulty in identifying them. In the current study, we focused on the effect of chlorine‐containing phases other than crystalline oxychlorides on the strength of cured MOC materials. The alcohol leachable chloride (ALC) was proposed to characterize the other phases containing chlorine, and the absolute ethanol leaching test was developed to determine ACL content in a cured MOC paste. The results showed that either decreasing MgO/MgCl₂ molar ratio or increasing H₂O/MgCl₂ molar ratio led to an increase in ALC content in cured MOC slurry, but adding a small amount of phosphoric acid resulted in very little or almost no ALC in the modified MOC slurry. In addition, increasing ALC content has been shown to significantly reduce the compressive strength of hardened MOC pastes. Thus, the modified MOC pastes had high strength, compared with the corresponding common MOC pastes. According to the experimental results, the relationship between the ALC content and the compressive strength of cured MOC materials was established. Therefore, a low ALC content was proposed as a characteristic index of high‐quality MOC materials.

中文翻译：

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乙醇可浸出氯化物对氯氧化镁水泥强度的影响

氯氧化镁水泥（MOC）中的主要晶相已得到广泛研究，但由于难以识别它们，其他相尚未进行研究。在当前的研究中，我们集中于结晶氯氧化物以外的含氯相对固化MOC材料强度的影响。提出了可醇浸出的氯化物（ALC）来表征含氯的其他相，并开发了无水乙醇浸出试验来确定固化的MOC浆料中的ACL含量。结果表明，降低MgO / MgCl ₂摩尔比或提高H ₂ O / MgCl ₂摩尔比导致固化的MOC浆料中ALC含量的增加，但是添加少量磷酸导致改性的MOC浆料中ALC非常少或几乎没有。此外，增加ALC含量已显示会显着降低硬化的MOC浆料的抗压强度。因此，与相应的普通MOC糊相比，改性MOC糊具有高强度。根据实验结果，建立了固化后的MOC材料的ALC含量与抗压强度之间的关系。因此，提出了低ALC含量作为高质量MOC材料的特征指标。