A Review on Performance and Application of Strain HardeningCementitious Composites
GAO Shuling1,2, WANG Wenchang1
1 School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401 2 Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401
Abstract: As a typical brittle material, concrete exhibits strain softening under tensile load. The unfavorable failure mode can adversely affect the mechanical properties and durability of engineering structure. By material design on a micro scale, strain hardening cementitious composites (SHCC)were developed by designing materials on a microscopic scale and considering the interaction between fiber, matrix and fiber/matrix interface. This is a new type of high performance fiber reinforced cementitious composites. Compared with the traditional fiber reinforced concrete, SHCC has two significant advantages: one is tensile strain hardening, and the other is the multiple micro-cracks before failure. High ductility makes it excellent in mechanical properties, and tight cracks effectively ensure durability. In recent years, the relevant research works have made great progress. At the initial stage of research, the material design theory guides it to achieve the desired results. The fiber-bridging law is the theoretical basis of SHCC. In order to achieve strain hardening, two criteria must be satisfied—strength criterion and energy criterion. After the material design is refined, various mechanical performance indicators can provide key information for engineering applications. High strength and high toughness material is one of the unremitting pursuits of researchers. At present, SHCC with compressive strength up to 115 MPa and ultimate tensile strain of 8% has been successfully designed. Moreover, most crack widths are maintained under 100 μm with the crack spacing less than 2 mm. Research on the fracture properties of SHCC is challenging, and there is still a lack of effective analytical methods in the multi-cracking stage. The split Hopkinson pressure bar test showed that SHCC is a strain rate dependence material, and the peak stress increased obviously with the increase of strain rate. Subjected to fatigue loading, SHCC exhibited ductile failure characteristics and relatively high fatigue life. At the same time, considering the long service life of engineering structure, the durability of materials cannot be ignored. The amount of water permeation decreased sharply due to the small crack width of SHCC. The permeability coefficient was only 2.10×10-7 m/s at 2% tensile strain level; besides, its self-hea-ling behavior can further reduce the permeability. SHCC also provides the possibility of application under extreme temperature conditions. After 300 freeze-thaw cycles, the performance of SHCC remained at a high level; after high temperature, the melted fibers leaved small channels to release vapor pressure, avoiding explosive spalling. In addition, the actual engineering can objectively and truly reflect the material properties. SHCC has been successfully applied in ordinary concrete beam reinforcement, masonry structure reinforcement, pavement engineering and dam repair. This paper introduces the design concept of SHCC, the basic criteria to be satisfied and the selection of raw materials, firstly. Then, the latest research achievements in the basic mechanical performance and durability of SHCC are presented separately. Additionally, the repair and reinforcement engineering structure and its engineering application using SHCC are summarized. Finally, the problems in the current SHCC research are discussed and the further research directions are proposed.
作者简介: 高淑玲,河北工业大学土木与交通学院教授、硕士生导师。2006年12月毕业于大连理工大学结构工程专业,获博士学位。主要致力于高延性水泥基复合材料的微观力学设计、本构关系、断裂破坏机理、叠合梁结构设计、界面粘结性能等方面的系统研究。主持和参与完成国家级科研项目4项、主持完成省级科研项目2项。主持和参与厅级科研项目8项,主持完成校级教改项目1项。申请发明专利3项、软件著作权1项,参与获得河北省科技进步二等奖1项,参与获得河北省交通运输厅科技进步一等奖、二等奖各1项。近年来,在高延性纤维增强水泥基复合材料领域发表论文40余篇,包括Construction & Building Materials、Advances in Civil Engineering、Journal of Wuhan University of Technology-Mater、《工程力学》和《应用基础与工程科学学报》等。任中国水力发电工程学会-岩石与混凝土断裂专业委员会委员。 王文昌,2017年7月毕业于中国石油大学(华东),获得工学学士学位。现为河北工业大学土木与交通学院研究生,在高淑玲教授的指导下进行研究。目前主要研究方向为纤维增强水泥基复合材料力学性能。
引用本文:
高淑玲, 王文昌. 应变硬化水泥基复合材料性能与应用研究进展[J]. 材料导报, 2019, 33(21): 3620-3629.
GAO Shuling, WANG Wenchang. A Review on Performance and Application of Strain HardeningCementitious Composites. Materials Reports, 2019, 33(21): 3620-3629.
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2019, Vol. 33 
