砂岩、大理岩—浆体界面区结构特征  

MICROSTRUCTURE OF INTERFACIAL TRANSITION ZONE OF MARBLE-CEMENT AND SANDSTONE-CEMENT PASTE

作　　者：董华[1] 钱春香[1] 

机构地区：[1]东南大学材料科学与工程学院,南京211189

出　　处：《硅酸盐学报》2008年第A01期192-196,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金重点项目(50539040);教育部新世纪优秀人才支持计划(No.NCET-05-0473)资助项目。

摘　　要：混凝土中骨料-浆体界面区的性能受着各方面的影响,并最终影响到混凝土的整体性能。利用扫描电镜、能谱分析、X射线衍射、显微硬度、背散射电子像以及体视显微镜研究了大理岩、砂岩骨料与水泥浆体界面过渡区的微观结构特征。结果表明:大理岩骨料-浆体界面有着大量的Ca(OH)_2,并形成明显的定向排列。砂岩的酸性和高吸水率的特点使得界面区显微硬度增大、Ca(OH)_2富集程度减小,但骨料-浆体界面过渡区存在较大孔隙,砂岩的吸水率和酸性特征应该辨证看待。The performance of the interfacial transition zone （ITZ） in concrete is influenced by many factors, which eventually affect the properties of concrete. The microstructures of ITZ in different types of aggregates （marble and sandstone） were investigated by means of scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, micro-hardness, backscattered electron imaging and stereo microscopy. The results show that the ITZ of marble-cement has an orientated arrangement of large numbers of Ca（OH）2. The micro-hardness increased and the content of Ca（OH）2 decreased in the ITZ of sandstone-cement, while the ITZ exhibited high porosity, due to certain characteristics of sandstone such as acidity and high water absorption. Based on these results, the characteristics of sandstone should be treated from a dialectical standpoint.

关 键 词：大理岩 砂岩 界面过渡区 显微硬度 

分 类 号：TU528[建筑科学—建筑技术科学]