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减水剂作用下氯氧镁水泥中水分侵蚀行为 预览

Moisture Erosion Behavior of Magnesium Oxychloride Cement with the Action of Water Reducer
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摘要 氯氧镁水泥(MOC)的弱耐水性是限制其广泛应用的主要原因,通过吸水试验探索了MOC中水分侵蚀行为及改善措施。由MOC质量变化曲线得出在水分扩散过程中存在物质溶出时间节点,该点与5Mg(OH)2·Mg Cl2·8H2O(P5)晶体耐水能力有关;添加减水剂后物质溶出节点时间后移,表明减水剂可改善MOC耐水性,毛细吸水系数结果表明减水剂提高了MOC的密实性;溶蚀动力学表明提高水泥耐水性的途径有降低水溶液温度、提高水溶液中氯化镁浓度、减少水解反应场所,而减水剂通过改变水化晶体形貌和提高水泥密实度等措施减少水解反应场所,提高了水泥耐水性;MOC混凝土性能试验结果表明,添加减水剂是改善MOC耐水性的有效途径之一。 The weak water resistance of magnesium oxychloride cement(MOC) is the main reason for limiting its wide application. In this paper, the water erosion behavior and improvement measures in MOC were explored by water absorption test. The material dissolution time point was found from the mass change curve, which was controlled by the water resistance of 5 Mg(OH)2·MgCl2·8 H2O(P5) crystal. The point disappeared later after addition of the water reducer, which indicated that the water reducer improved the water resistance of the MOC. Capillary water absorption coefficient results showed that the water reducer improved the compactness of the MOC. The dissolution kinetics showed that the way to improve the water resistance of cement was to reduce aqueous solution temperature, increase the concentration of magnesium chloride in aqueous solution, and reduce the location of hydrolysis reaction. And the water reducer reduced the hydrolysis location by changing the morphology of the hydrated crystal and improving the cement compactness, and improves the water resistance of the cement. The performance test of MOC concrete indicated that water absorption test can characterize the water resistance of MOC and way.
作者 冯超 关博文 张奔 陈华鑫 房建宏 Feng Chao;Guan Bowen;Zhang Ben;Chen Huaxin;Fang Jianhong(School of Materials Science and Engineering,CHANG’AN University,Xi’an,Shaanxi,710064;Ministry of Education Engineering Center for Traffic Pavement Materials,Xi’an,Shaanxi 710064;Qinghai Research Institute of Transportation,Xining,Qinghai 810000)
出处 《非金属矿》 CAS CSCD 北大核心 2019年第2期41-44,共4页 Non-metallic Mines
基金 国家重点研发计划(2017YFB0309903) 青海省自然科学基金(2017-ZJ-764) 中央高校基本科研业务费专项资金资助(nos.310831172201、300102318401和300102318501).
关键词 减水剂 氯氧镁水泥 水分传输 耐水性 改善措施 water reducer magnesium oxychloride cement moisture transport water resistance improvements measures
作者简介 通信作者:陈华鑫,E-mail:chen_hxin@sina.com。
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