Fracture Models and Effect of Fibers on Fracture Properties of Cementitious Composites-A Review.
Fracture Models and Effect of Fibers on Fracture Properties of Cementitious Composites-A Review.
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DOI：
10.3390/ma13235495
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发表时间：
2020-12-02
期刊：
影响因子：
--
通讯作者：
Ling Y
中科院分区：
文献类型：
--
作者：
Zhang P;Yang Y;Wang J;Jiao M;Ling Y
水泥基复合材料具有良好的延性和伪裂纹控制。然而，在这些复合材料的实际应用中，外部载荷和环境侵蚀最终在基体中形成大裂纹，导致基体断裂。水泥基复合材料的断裂不仅会导致结构缺陷，而且会造成与水泥基复合材料构件的维护和加固相关的经济损失。因此，有必要对水泥基复合材料的断裂性能进行研究，以防止基体的断裂。本文提出了水泥基复合材料的多裂纹开裂模型、虚拟裂纹模型、裂纹带模型、伪应变硬化模型和双K断裂模型，并分析了它们的优缺点。多裂纹开裂模型可以确定纤维在基体中的最佳掺量。虚拟裂纹模型和裂纹带模型是描述断裂过程区粘聚力的应力软化模型。伪应变硬化模型主要适用于韧性材料。双K断裂模型主要描述混凝土的断裂过程。此外，还分析了聚乙烯醇（PVA）纤维和钢纤维（SFs）对基体断裂性能的影响。在水泥基复合材料中掺入1.5 ~ 2%的PVA纤维或4%的钢纤维（SF），可显著改善水泥基复合材料的断裂性能。掺入1.5%的钢纤维和1%的PVA纤维也能改善水泥基复合材料的断裂性能。然而，水泥基复合材料在实际工程中的应用还有许多问题需要解决。因此，需要进一步研究解决工程中经常遇到的断裂问题。
Cementitious composites have good ductility and pseudo-crack control. However, in practical applications of these composites, the external load and environmental erosion eventually form a large crack in the matrix, resulting in matrix fracture. The fracture of cementitious composite materials causes not only structural insufficiency, but also economic losses associated with the maintenance and reinforcement of cementitious composite components. Therefore, it is necessary to study the fracture properties of cementitious composites for preventing the fracture of the matrix. In this paper, a multi-crack cracking model, fictitious crack model, crack band model, pseudo-strain hardening model, and double-K fracture model for cementitious composites are presented, and their advantages and disadvantages are analyzed. The multi-crack cracking model can determine the optimal mixing amount of fibers in the matrix. The fictitious crack model and crack band model are stress softening models describing the cohesion in the fracture process area. The pseudo-strain hardening model is mainly applied to ductile materials. The double-K fracture model mainly describes the fracture process of concrete. Additionally, the effects of polyvinyl alcohol (PVA) fibers and steel fibers (SFs) on the fracture properties of the matrix are analyzed. The fracture properties of cementitious composite can be greatly improved by adding 1.5–2% PVA fiber or 4% steel fiber (SF). The fracture property of cementitious composite can also be improved by adding 1.5% steel fiber and 1% PVA fiber. However, there are many problems to be solved for the application of cementitious composites in actual engineering. Therefore, further research is needed to solve the fracture problems frequently encountered in engineering.
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