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基于测量高温侵蚀厚度的氯氧镁水泥抗水性的快速评价方法

DOI: 10.7521/j.issn.0454-5648.2014.08.15

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Abstract:

针对当前评价氯氧镁水泥(MOC)抗水性方法的实验时间长(28d)和实验设备昂贵等不利于产品质量检测的因素,提出了以Arrhenius关系为理论基础的MOC抗水性快速评价方法。首先讨论了MOC在水中的侵蚀厚度与浸水时间的关系、建立了关联高温和低温侵蚀速率的Arrhenius方程,明确了强度保留率与相对侵蚀厚度的关系,并根据强度退化速率将MOC在水中的强度退化过程划分为4个阶段(稳定期、快速下降期、缓慢下降期和残余强度期)。在此基础上提出了基于测量高温侵蚀厚度的MOC抗水性快速评价方法,同时结合实例分析了评价结果的准确度和误差来源。结果表明新方法定性评价MOC抗水性的实验时间仅为10h,半定量和定量评价的实验时间可缩短到24h;预测MOC试件所处的强度退化阶段与实验结果完全相符,预测试件强度保留率的最大相对误差为-17.37%。

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