硅酸盐学报

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

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

分类号：TQ177.5

出版年,卷(期):页码：2014,42(8):1047-1054

DOI：10.7521/j.issn.0454－5648.2014.08.15

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(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%。

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 (28d) 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 stage) 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 10h, and the semi－quantitative and quantitative evaluation time is 24h. 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 -17.37%.

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资助。

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。

参考文献：

References：
[1]　LI Y, YU H F, DONG J M, et al. Reseach development on hydration product, phase transformation and water resistance evaluation method of magnesium oxychloride cement ［J］. J Chin Ceram Soc, 2013, 41(11): 1465－1473.
[2]　WEN J, YU H F, WU C Y, et al. Hydration kinetic and influencing parameters in hydration process of magnesium oxychloride cement ［J］. J Chin Ceram Soc, 2013, 41(5): 588－596.
[3]　LI C, YU H F, LI Y, et al. Study on moisture absorption and effloresence properties of magnesium oxychloride cement materials［J］. Bull Chin Ceram Soc (in Chinese), 2011, 2, 373－378.
[4]　ZHANG C M, DENG D H. Study on the water resistence indicator of magnesium oxychloride cement ［J］. New Build Mater (in Chinese), 1995(2): 11－14.
[5]　LITHERLAND K L, OAKLEY D R, PROCTOR. B A. The use of accelerated ageing procedures to predict the long term strength of GRC composites ［J］. Cem Concr Res, 1981, 11(3): 455－466.
[6]　LUTZE W, MALOW G, EWING R C, et al. Alteration of basalt glasses: implications for modelling the long－term stability of nuclear waste glasses ［J］. Nature, 1985, 314(6008): 252－255.
[7]　LI Z J, CHAU C K. Reactivity and function of magnesium oxide in sorel cement ［J］. J Mater Civil Eng, 2008, 20(3): 239－244.
[8]　LI Y, YU H, ZHENG L, et al. Compressive strength of fly ash magnesium oxychloride cement containing granite wastes ［J］. Constr Build Mater, 2013, 38: 1－7.
[9]　WEN J, YU H F, LI Y, et al. Effects of H3PO4 and Ca(H2PO4)2 on mechanical properties and water resistance of thermally decomposed magnesium oxychloride cement ［J］. J Cent South Univ－En Ed, 2013, 20(12): 3729－3735.
[10]　TAN Y N, LIU Y, GROVER L. Effect of phosphoric acid on the properties of magnesium oxychloride cement as a biomaterial ［J］. Cem Concr Res, 2014, 56: 69－74.
[11]　ZHENG L N, LI Y, YU H F, et al. Effect of pretreatment methods on leaching of free Cl－ in magnesium oxychloride cement ［J］. J Cent South Univ－Sci Ed (in chinese), 2013, 44(7): 2720－2725.
[12]　DENG Dehua. A study on the theories and techbiques for improving the properties of MgO－based basic salt cement and their articles (in Chinese, dissertation). Changsha: Central South University, 2005.
[13]　BERTRON A, DUCHESNE J, ESCADEILLAS G. Accelerated tests of hardened cement pastes alteration by organic acids: analysis of the pH effect ［J］. Cem Concr Res, 2005, 35(1): 155－166.
[14]　LAURENT D W, DEVILLERS P. Modeling the degradation of Portland cement pastes by biogenic organic acids ［J］. Cem Concr Res, 2010, 40(8): 1165－1174.
[15]　BEAUDOIN J J, RAMACHANDRAN V S. Strength development in magnesium oxychloride and other cements ［J］. Cem Concr Res, 1975, 5(6): 617－630.

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