偏高岭土对水化硅酸镁水泥结构与性能的影响  

Effect of Metakaolin on Structure and Properties of Hydrated Magnesium Silicate Cement

作　　者：王梓涵 毕万利 房卉[1,2] 张婷婷 滕莹雪[1,2] WANG Zihan;BI Wanli;FANG Hui;ZHANG Tingting;TENG Yingxue(College of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Research Institution of Keda Fengchi Magnesium Building Materials,University of Science and Technology Liaoning,Anshan 114051,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]辽宁科技大学科大峰驰镁建材研究院,辽宁鞍山114051 [3]大连理工大学建设工程学部,辽宁大连116024

出　　处：《建筑材料学报》2022年第2期117-123,共7页Journal of Building Materials

基　　金：辽宁省镁产业协同创新中心开放课题基金项目(USTLXT 201803);辽宁科技大学校基金项目(2018FW02)。

摘　　要：将偏高岭土引入水化硅酸镁水泥中并测定其抗压强度、pH值,同时研究其物相组成和微观结构.结果表明:偏高岭土掺量小于10%时,可以提高水化硅酸镁水泥的28 d抗压强度,其中偏高岭土掺量为8%时,水化硅酸镁水泥的28 d抗压强度提高了60.9%;偏高岭土中的Al_(2)O_(3)参与了反应,导致体系的水化程度增大,偏高岭土掺量为8%时体系的水化程度最大,质量损失比空白组高3.08%;偏高岭土会导致水化硅酸镁水泥体系的pH值升高,随着偏高岭土掺量的增加,硅灰溶解量减少,影响了水化硅酸镁的生成.Metakaolin was introduced into the hydrated magnesium silicate cement and the compressive strength and pH value of the hydrated magnesium silicate cement were measured.The phase and microstructure of the hydrated magnesium silicate cement mixed with metakaolin were analyzed.The results show that the compressive strength of the magnesium silicate hydrate can be improved by adding less than 10%metakaolin,and the compressive strength of the magnesium silicate hydrate can be increased by 60.9%when 8%metakaolin is added.Al_(2)O_(3) in metakaolin participates in the reaction,which leads to the increase of hydration degree of the system.The hydration degree is the largest when the content of metakaolin is 8%and the mass loss is 3.08%,which is higher than that of the blank group.The pH value of the hydrated magnesium silicate cement system is increased by metakaolin,and the amount of silica fume dissolved decreases with the increase of the content of metakaolin,which affects the formation of hydrated magnesium silicate.

关 键 词：偏高岭土 水化硅酸镁水泥 微观结构 水化硅酸镁 水化硅酸镁铝 

分 类 号：TU528.31[建筑科学—建筑技术科学]