Impact resistance of polyvinyl alcohol-polypropylene fiber toughened foamed concrete under low-velocity impact: experiments and 3D meso-scale modelling

作者：Xinxin Shi, Baokuan Ning, Junxiang Wang, Taotao Cui, Weifeng Zhao, Anqi Li · 发表于：Case Studies in Construction Materials · 年份：2024 · DOI：10.1016/j.cscm.2024.e03976 · 被引用次数：6 · 研究领域：Innovative concrete reinforcement materials、High-Velocity Impact and Material Behavior、Structural Response to Dynamic Loads

Foamed concrete exhibits good energy absorption and shock absorption properties due to its microporous structure. Compared with conventional concrete, foamed concrete can more readily enter the plastic stage and more effectively reflect and absorb impact energy. However, a scientific deficit of knowledge about the impact resistance of foamed concrete with various hardeners and there is a lack of accurate verified models of such a process. In this study, the impact resistance of polyvinyl alcohol-polypropylene fiber toughened foamed concrete under different impact speeds and different amounts of polyvinyl alcohol has been investigated using the cube drop weight impact test. The toughening mechanism of polyvinyl alcohol is revealed through XRD analysis. In addition, 3D meso-scale modelling of a composite material composed of foam, mortar, an interface transition zone and fiber was conducted using the Python-based secondary development of Abaqus to simulate impact resistance. The results have demonstrated that the impact resistance (ultimate bearing capacity, total absorbed energy and dynamic increase factor) of the toughened foamed concrete samples initially increased and subsequently decreased with the addition of polypropylene fiber and polyvinyl alcohol. At the impact speed of 1.6 m/s, compared with ordinary foamed concrete, the ultimate bearing capacity of polyvinyl alcohol polypropylene fiber toughened foamed concrete is increased by 107.8%, the total absorbed energy is in...