改性剂在氯氧镁胶凝材料中对硬化结晶相的影响及对游离氯离子减少的试验研究  

Effects of modifiers on the strengthening phase and free Cl ion in magnesium oxychloride cement

作　　者：朱燕凤 朱效兵 朱玉杰 

机构地区：[1]济南市杰美菱镁建材研究所,山东济南250031

出　　处：《江苏建材》2019年第1期36-41,共6页Jiangsu Building Materials

摘　　要：改性剂可以改善氯氧镁胶凝材料制品的硬化结构,增强耐水性,减少成品中游离氯离子含量,解决氯氧镁制品易吸潮返卤的问题。文章通过两方面重点论述:①通过XRD射线衍射谱图与CEM扫描电子显微镜观察,改性剂具有改变硬化结晶相的结构形态,促进硬化结晶相生成,提高反应产物稳定性的作用;②改性后的氯氧镁胶凝材料试样比空白试样游离氯离子降低了30%～70%,空白试样浸泡6 h游离氯离子浸出量:7%,几乎全部被浸出,而改性后的试样6 h游离氯离子浸出量:2.5%,24 h游离氯离子浸出量:3.8%,改性剂显著地减少了游离氯离子的量,提高了氯氧镁胶凝材料的耐水性。Modifiers can modifiy the strengthening crystalline phase and decrease the content of free Cl ion in magnesium oxychloride cement, thus improving its stability in water. In the present work, it is found that the modifiers promotes the formation of strengthening crystalline phase,improves its morphology and results in a higher stability of magnesium oxychloride cement. It is found that only 2.5 % and 3.8 % free Cl ions in modified magnesium oxychloride cement are removed after 6 hours and 24 hours, respectively. But almost all free Cl ions (i,e. 7 %) in unmodified samples are removed. The experimental results indicate that the modifiers can obviously improve the stability of magnesium oxychloride cement in water.

关 键 词：氯氧镁胶凝材料 游离氯离子 结晶相 微观形貌 抗水能力 

分 类 号：TU528[建筑科学—建筑技术科学]