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基于测量高温侵蚀厚度的氯氧镁水泥抗水性快速评价方法
作者:李颖1 余红发1 2 
单位:1. 中国科学院青海盐湖研究所 西宁 810008 2.南京航空航天大学土木工程系 南京 210016 
关键词:氯氧镁水泥 抗水性 评价方法 强度保留率 侵蚀速率 侵蚀厚度 强度退化阶段  软化系数 
分类号:TQ177.5
出版年,卷(期):页码:2014,42(8):00-00
DOI:
摘要:

针对当前评价氯氧镁水泥(MOC)抗水性方法的实验时间长(28 d)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);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10 h,半定量和定量评价的实验时间可缩短到24 h;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%;定性评价的实验设备可简化成1个家用保温暖瓶,半定量和定量评价仅用恒温、切割和测量设备(例如:恒温水浴锅、锯条和游标卡尺)代替价格昂贵的压力试验机。抗水性快速评价方法具有实验设备简单、实验时间短,评价结果准确度高等优点。

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The paper presents a water resistance rapid assessment system (WRRAS) for magnesium oxychloride cement (MOC) based on the Arrhenius equation in order to improve the time-consuming operation (28 d) and the existing equipment used. The relationships between the erosion thickness and leaching time and between the  strength retention ratio and relative erosion thickness for MOC in water were discussed. The four strength degradation stages (i.e. stabilization stage, rapid decline stage, slow decline stage and residual strength) were analyzed. The process of WRRAS was introduced according to high-temperature erosion thickness in water. The accuracy and error sources of the evaluation results were analyzed. The results show that the experimental time of qualitative evaluation for water resistance is only 10 h, and the semi-quantitative and quantitative evaluation time is 24 h. The predicted strength degradation stage of MOC in water consists with the experimental process, and the maximum relative error of predicted strength retention ratio is -7.37%. The thermostatic, cutting and measuring devices (i.e., thermostatic water bath, blade and vernier caliper) can be used as the strength testing machines for semi-quantitative and quantitative evaluation except a thermos flask for qualitative evaluation. The WRRAS is a rapid operation and reliable method with the simple devices and the accurate results.

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基金项目:
国家自然科学基金面上项目(21276264),青海省科技厅高新技术研究与发展计划(2013-G-208),中国科学院青海盐湖研究所青年引导基金。
作者简介:
第一作者:李 颖(1982—),男,博士。 通信作者:余红发(1964—),男,博士,教授,博士研究生导师。
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参考文献:

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