基于UDEM-ACE方法的ECC配合比优化设计  

Optimized Mix Proportion Design of ECC Based on the UDEM-ACE Method

作　　者：李晓琴[1] 杨潇 丁祖德[1] 申林方[1] 杜茜[1] LI Xiaoqin;YANG Xiao;DING Zude;SHEN Linfang;DU Xi(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500)

机构地区：[1]昆明理工大学建筑工程学院

出　　处：《材料导报》2019年第14期2354-2361,共8页Materials Reports

基　　金：国家自然科学基金(51768028;51308271;51508253)~~

摘　　要：高韧性水泥基复合材料(ECC)相对于普通混凝土材料具有较高的极限拉伸应变能力,可以有效解决混凝土基础设施的开裂、渗漏水问题。ECC的力学性能严重依赖于原材料性能,而各地原材料性能均有差异;同时,ECC性能的优异性可通过调节其配合比进行控制。采用基于均匀试验设计方法(UDEM)与非参数回归分析(NPRA)中的交互式条件期望算法(ACE)相结合的配合比设计方法进行ECC配合比设计,获得云南昆明地区的ECC优化配合比。通过轴心抗拉试验和薄板四点弯曲试验进行ECC优化配合比试验验证,同时采用扫描电子显微镜随机检测纤维的分散情况。结果表明,基于UDEM-ACE方法得到的ECC优化配合比试块具有较高的极限拉伸应变能力和能量吸收能力,且纤维分布均匀。UDEM-ACE配合比设计方法具有良好的可行性和可靠性,能够为其他地区的ECC配合比优化设计以及其他水泥基体材料的配合比设计提供理论及实践指导意义。High-performance engineered cementitious composites(ECC)have a high ultimate tensile strain compared with the normal concrete,which could be used to prevent the cracking and leakage problems for concrete infrastructure.The mechanical properties of ECC strongly depended on the raw materials.Meanwhile,based on the same raw materials,ECC material properties are mainly controlled by its mix proportion.Based on the materials and industrial wastes in Kunming Yunnan province,the uniform design experiment method(UDEM)with alternating conditional expectations(ACE)which is a non-parametric regression analysis(NPRA)method are chosen to obtain the optimal mix proportion range of ECC.The axial tensile tests and thin plate four-point bending test were conducted,and the scanning electron microscope instrument was used to randomly detect fiber dispersion in the tested specimens.The verification tests improved that the optimized ECC mix proportion specimens,which were obtained based on the UDEM-ACE method,gave large ultimate tensile strain capacity and energy absorption capacity,and the fiber distribution was uniformed.Some reference values for the application of ECC mix proportion and mixing process based on Kunming in Yunnan Province are provided.This paper can provide theoretical and practical guidance for the mix proportion optimization design of ECC for other regions and the design for other cement-based materials as well.

关 键 词：高韧性水泥基复合材料(ECC) 配合比优化设计 均匀试验-交互式条件期望(UDEM-ACE)算法 极限拉伸应变 应变硬化 

分 类 号：TU528[建筑科学—建筑技术科学]