地下工程水环境下三元乙丙橡胶防水卷材微观特性研究  

Study on Microstructural Characteristics of Ethylene-Propylene-Diene Monomer Waterproof Sheet in Groundwater Environment

作　　者：王庆国[1,2] 杨其新[1,2] 蒋雅君[1,2] 杨娟[1,2] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《隧道建设》2016年第3期270-274,共5页Tunnel Construction

基　　金：国家自然科学基金资助项目(51178401;51108385);国家重点基础研究发展计划(973计划)项目(2010CB732105)

摘　　要：微观结构特性是材料宏观现象的本质反映,利用X射线CT技术对地下工程三元乙丙橡胶防水卷材（EPDM）的微观结构进行研究,探讨该种材料的孔隙结构特性。使用Na Cl溶液模拟地下水环境,借助显微CT设备对地下水环境下的三元乙丙橡胶防水卷材进行扫描,通过Matlab软件对所得图像进行处理,并引入孔隙等效直径概念,进行孔隙结构参数的计算和分析。结果表明：所分析二维切片图像的大部分指标值较为接近;孔隙直径分布在0~60μm,直径20μm是孔隙个数分布规律变化的转折点;较大和较小直径的孔隙对其面积分布有重大贡献。结果证实,利用X射线CT技术可实现对地下工程防水材料微观孔隙特性的研究,为下一步防水材料损伤机制的研究提供方法基础。Microstructural characteristics are the essential reflection of macro phenomenon. Microstructure of EthylenePropylene-Diene Monomer（ EPDM） waterproof sheet applied to underground engineering is studied by using X-ray CT technology; and the structural properties of pores in the material are discussed. The Na Cl solution is prepared to simulate the groundwater environment. The EPDM waterproof sheet in groundwater environment is scanned with microCT; the acquired five images are processed with Matlab software; the concept of pore equivalent diameter is introduced and the relevant pore parameters are analyzed. The results show that： 1） There is only little difference among pore parameters of the five images. 2） The pore diameters are mainly in the range of 0- 60 μm; and the diameter of 20 μm is the turning point of pore number distribution. 3） The large and small pores have a significant effect on pore area distribution. It is proved that the micro-CT is a feasible method for studying microscopic pore characteristics of waterproof material in underground engineering,so as to provide a basis for the farther research on damage mechanism of waterproof material.

关 键 词：地下工程 防水卷材 显微CT技术 图像处理 微观结构 等效直径 

分 类 号：U454[建筑科学—桥梁与隧道工程]