碱激发矿渣/偏高岭土复合胶凝材料干燥收缩机理研究  

Mechanisms of Drying Shrinkage for Alkali⁃Activated Slag/Metakaolin Composite Materials

作　　者：李爽 刘和鑫 杨永 李青[1] 张之璐 朱效宏[1] 杨长辉[1] 杨凯[1] LI Shuang;LIU Hexin;YANG Yong;LI Qing;ZHANG Zhilu;ZHU Xiaohong;YANG Changhui;YANG Kai(College of Materials Science and Engineering,Chongqing University,Chongqing 40045,China;Chengdu Institute of Product Quality Inspection Co.Ltd,Chengdu 610000,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]成都产品质量检验研究院有限责任公司,成都610000

出　　处：《材料导报》2021年第4期4088-4091,共4页Materials Reports

基　　金：国家自然科学基金(51878102);十三五国家重点研发计划(2017YFB0309905);重庆市自然科学基金(cstc2018jcyjAX0403)。

摘　　要：本实验研究了偏高岭土掺量、碱当量及养护温度对碱激发矿渣/偏高岭土砂浆(AASM)干燥收缩性能的影响。结果表明:掺入50%(质量分数)偏高岭土的碱激发体系质量损失加大、内部相对湿度较低,但由于其游离水与基体产物中晶体含量增加,干缩对质量损失的敏感性显著降低。另外,适当提升养护温度可进一步改善产物中晶体成分,能够更好地降低体系干缩。值得注意的是,AASM易碳化,且过高碱当量(如10%)与过长高温养护时间都会降低改善干缩的效果。This study examined influences of metakaolin,alkali concentration and curing regimes on the drying shrinkage of alkali⁃activated slag⁃metakaolin materials(AASM).The results indicated that comparing to the reference sample(no metakaolin),the mass loss of composite materials increased and the internal relative humidity decreased,when the metakaolin was added to replace the 50%slag.Meanwhile,the content of free water and reaction products with crystal structure increased in these materials,which is helpful to reduce the sensitivity of drying shrinkage to mass loss.In addition,appropriately increased of curing temperature could improve the crystal structure of reaction products,which is helpful to reduce the drying shrinkage of the materials.It was noted that AASM was eased be carbonized.Besides,too high alkali concentration(such as 10%)and too long high temperature curing time would have negative effect to drying shrinkage.

关 键 词：矿渣/偏高岭土复合材料 干燥收缩 内部相对湿度 碳化 

分 类 号：TU528.01[建筑科学—建筑技术科学]