基于微观力学和断裂力学试验方法的MMFM-ECC配合比设计  

MMFM-ECC design method based on micro mechanics and fracture mechanics

作　　者：李晓琴[1,2] 杜茜 战越[3] 宋志刚 LI Xiao-qin1＇2, DU Xi1＇2 , ZHAN Yue3 , SONG Zhi-gang1(1.Department of Civil Engineering, Kunming University of Science and Technology, Kunming 650000, China; 2.Shanghai Key Laboratory of Engineering Structural Safety, Shanghai 200000, China 3.Yunnan Construction Investment and Transportation Construction Limited by Share Ltd, Kunming 650500,Chin)

机构地区：[1]昆明理工大学建筑工程学院土木系,云南昆明650500 [2]上海市工程结构安全重点实验室,上海200032 [3]云南建投交通建设股份有限公司,云南昆明650500

出　　处：《云南大学学报（自然科学版）》2018年第2期307-314,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：上海市工程结构安全重点实验室开放课题(2015-KF05);教育部留学回国人员科研启动基金(教外司留[2013-1792]号文件);国家自然科学基金(51308271)

摘　　要：高性能工程水泥基复合材料(Engineered Cementitious Composites,简写为ECC)相对于普通混凝土材料具有较高的极限拉伸应变能力.相对于目前广泛采用的粗放式配合比列表法、绝对体积法、正交试验法的ECC配合比设计方法,采用基于微观力学和断裂力学模型(Micro-Mechanics and Fracture Mechanics,简写为MMFM)的ECC配合比设计方法在水泥基质和纤维参数的选择上具有更好的理论依据和科学性.研究采用我国云南昆明地方材料资源和工业废料通过MMFM-ECC配合比设计方法进行配合比设计,并通过轴向压缩试验、双面剪切和四点弯曲试验结果检测实际ECC的各项性能指标.通过比较ECC设计目标性能指标和试验测得的实际性能指标分析讨论了MMFM-ECC配合比设计方法对试验仪器、试验过程、试验样本数的具体要求.High-performance engineered cementitious composites（ ECC） have a high ultimate tensile strain compare with the common concrete.Compared with the widely used formula method,absolute volume method and orthogonal test method,the design method based on micro-mechanics and Fracture Mechanics（ MMFM） prove to give scientific directions on choosing fibers and cementitious matrix. Local materials in Kunming have been used with MMFM-ECC method in this paper.The ECC specimens have been tested with axial compression,double-sided shear and four-point bending tests.The test results have been compared with the target performance index of the ECC at the very beginning of the MMFM-ECC design,and the requirements of the MMFM-ECC design including equipment,test process and sample numbers have been discussed.

关 键 词：高性能工程水泥基复合材料 MMFM-ECC配合比设计方法 PVA纤维 极限拉伸应变 应变硬化 

分 类 号：TU528[建筑科学—建筑技术科学]