使用绿色辅助材料实现更具延展性的 Engineered Cementitious Composites（ECC，工程水泥基复合材料）

Using Green Supplementary Materials to Achieve More Ductile ECC.

作者信息

Wang Yichao, Zhang Zhigang, Yu Jiangtao, Xiao Jianzhuang, Xu Qingfeng

机构信息

Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University, Shanghai 200092, China.

Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China.

出版信息

Materials (Basel). 2019 Mar 14;12(6):858. doi: 10.3390/ma12060858.

DOI:10.3390/ma12060858

PMID:30875763

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6471103/

Abstract

To improve the greenness and deformability of engineered cementitious composites (ECC), recycled powder (RP) from construction and demolition waste with an average size of 45 μm and crumb rubber (CR) of two particle sizes (40CR and 80CR) were used as supplements in the mix. In the present study, fly ash and silica sand used in ECC were replaced by RP (50% and 100% by weight) and CR (13% and 30% by weight), respectively. The tension test and compression test demonstrated that RP and CR incorporation has a positive effect on the deformability of ECC, especially on the tensile strain capacity. The highest tensile strain capacity was up to 12%, which is almost 3 times that of the average ECC. The fiber bridging capacity obtained from a single crack tension test and the matrix fracture toughness obtained from 3-point bending were used to analyze the influence of RP and CR at the meso-scale. It is indicated that the replacement of sand by CR lowers the matrix fracture toughness without decreasing the fiber bridging capacity. Accordingly, an explanation was achieved for the exceeding deformability of ECC incorporated with RP and CR based on the pseudo-strain hardening (PSH) index.

摘要

为提高工程水泥基复合材料（ECC）的绿色度和可变形性，采用平均粒径为45μm的建筑拆除废弃物再生粉末（RP）和两种粒径的橡胶颗粒（40CR和80CR）作为混合料的添加剂。在本研究中，ECC中使用的粉煤灰和硅砂分别被RP（按重量计50%和100%）和CR（按重量计13%和30%）替代。拉伸试验和压缩试验表明，掺入RP和CR对ECC的可变形性有积极影响，尤其是对拉伸应变能力。最高拉伸应变能力高达12%，几乎是普通ECC的3倍。通过单裂缝拉伸试验获得的纤维桥接能力和通过三点弯曲获得的基体断裂韧性用于分析RP和CR在细观尺度上的影响。结果表明，用CR替代砂会降低基体断裂韧性，但不会降低纤维桥接能力。因此，基于伪应变硬化（PSH）指数，对掺入RP和CR的ECC的超可变形性给出了解释。