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熟料氧化镁含量对水泥浆水化与收缩的影响
作者:宋强 张琼琼 徐德龙 
单位:西安建筑科技大学材料与矿资学院 西安 710055 
关键词:高镁熟料 方镁石 水化 收缩 碳化 
分类号:TQ 172
出版年,卷(期):页码:2017,45(5):0-0
DOI:10.14062/j.issn.0454-5648.2017.05.07
摘要:

 探讨了熟料中MgO含量对水泥收缩和水化的影响。通过X射线衍射和热重分析分别对不同氧化镁含量的熟料A矿晶型、方镁石相对含量和水泥水化产物进行了表征,并测试了3种养护条件下水泥的收缩特性。结果表明:熟料中的方镁石含量随着MgO含量增加而增加,方镁石早期水化速率较快,提高养护温度可以加速方镁石早期水化,方镁石水化膨胀能够降低水泥在干燥环境中的收缩,增加水浴环境中的膨胀。Mg(OH)2以无定型、六方片状等形态存在于水化后的水泥中,且富集于Ca(OH)2附近,并与Ca(OH)2共同碳化生成CaMg(CO3)2等晶体。

 

 The impact of MgO contained in clinker on the shrinkage, hydration of cement was investigated. Alite polymorph and periclase relative contents in industrious clinker and hydrates of cement were determined by X-ray diffraction and derivative thermogravimetry. The mortar shrinkage was measured. The results show that periclase content increases with the increase of MgO content. Periclase hydrates at a higher rate at early age, and the increase of cured temperature accelerates the hydration rate. The expansion of periclase can decrease the shrinkage and increase the expansion of cement cured in dry environment and in water, respectively. The hydrate of periclase becomes amorphous or hexagonal plates, concentrates near-by Ca(OH)2, and carbonates with Ca(OH)2 to form CaMg(CO3)2.

 
基金项目:
国家重点研发计划项目(2016YFB0303400);国家重点基础研究发展(973)计划(2012CB723302)。
作者简介:
宋 强(1980—),男,博士研究生。
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