骨料粒径对MgO水泥基材料压蒸膨胀变形及孔隙结构的影响  

Influence of aggregate size on autoclave-treated expansibility and pore structure of cement-based material with MgO

作　　者：赵振华[1] 李维维[1] 陈昌礼[1] 冯义林 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550025

出　　处：《混凝土》2016年第2期102-105,共4页Concrete

基　　金：国家自然科学基金项目(51269003);贵州省水利厅科技专项经费资助项目(KT201322)

摘　　要：为了探索水工混凝土中MgO极限掺量的确定方法,进行了骨料粒径对外掺MgO水泥基材料压蒸膨胀变形及孔隙结构的影响的试验研究。试验结果表明,骨料粒径对MgO水泥基材料的压蒸膨胀变形及孔隙结构有重要影响。随着骨料粒径的增大,外掺MgO水泥基材料的压蒸膨胀变形由大变小的顺序是:水泥砂浆>一级配混凝土砂浆>二级配混凝土砂浆>三级配混凝土砂浆>四级配混凝土砂浆,MgO极限掺量随骨料粒径变化的规律则相反。骨料粒径对试件孔隙结构参数的影响,在MgO极限掺量之前和之后的规律相似,水泥砂浆试件对于结构破坏的灵敏度最高。To explore the ascertaining method of MgO ultimate content in hydraulic concrete, the experimental research of influence of aggregate size on autoclave -treated expansibility and pore structure of cement -based material with MgO was tested.The results show that the influence of aggregate size on autoclave - treated expansibility and pore structure of cement - based material with MgO is im- portant.The order from large to small of the autoclave - treated expansibility with the increase of aggregate size is ,mortar 〉 one - grade concrete mortar 〉 two - grade concrete mortar 〉 three - grade concrete mortar 〉 four - grade concrete mortar. The order of MgO ulti- mate content is inverse with the changing of aggregate size.The influence of aggregate size on the pore structure parameter is similar be- fore and after MgO ultimate content.The sensitivity of mortar specimen on structure damage is highest.

关 键 词：MgO水泥基材料 压蒸膨胀率 孔隙结构 骨料粒径 

分 类 号：TU528.041[建筑科学—建筑技术科学]