聚苯乙烯轻质混合土强度变形特性的微观试验研究  

Experimental study on microstructure of lightweight EPS-bead-treated soil mechanical behavior

作　　者：姬凤玲[1] 吕擎峰[2] 马殿光[3] 

机构地区：[1]深圳大学土木工程学院,广州深圳518060 [2]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000 [3]中华人民共和国交通部天津水运工程科学研究所,天津300456

出　　处：《兰州大学学报（自然科学版）》2007年第1期19-23,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金资助项目(50379011)

摘　　要：聚苯乙烯(EPS)轻质混合土是一种新型的轻质土工材料．通过扫描电镜对聚苯乙烯颗粒轻质混合土的微观性状进行了研究,从轻质混合土的微结构基本单元的形状、基本单元体的接触状态、基本单元体间的联结形式等微观角度解释了轻质混合土的强度变形机理．其微观结构研究表明,轻质混合土试样内部由于水泥水化、水解形成的网络状胶结结构是其强度的主要来源;轻质混合土中的EPS颗粒是通过置换效应和空间效应影响强度变形特性的．Lightweight EPS-beads-treated soil is a new type of lightweight geo-materials （LGM）. In this paper, microscopic behavior of LGM was studied using a scanning electronic microscope. The mechanic characteristics of LGM was explained from the microscopic structure, such as the shape and contact form of the basic element. The results showed that the strength of LGM mainly gained from the micro-grid cementing structure generated by hydration of cement. The mechanical characteristics of LGM were mainly influenced by replacement and space effect of EPS.

关 键 词：聚苯乙烯轻质混合土 EPS颗粒 轻质土工材料 微观结构 强度 

分 类 号：TU431[建筑科学—岩土工程]