Abstract: In order to enhance the toughness and fracture performance of airport cement concrete, fiber reinforced concrete was prepared by using modified polyester fiber (FC), polyvinyl alcohol fiber (PVA) and polypropylene crude fiber (PP) as reinforcing materials. The optimum mixture ratio of FC fiber reinforced concrete was determined by response surface method with sand ratio, amount of FC fiber and water reducer as the influencing factors and 28 d flexural strength as the response value. The flexural toughness and fracture performance of three kinds of fiber reinforced concrete were studied by three-point bending toughness test and three-point bending fracture test, and the mechanism of fiber toughening and crack resistance was analyzed. The results show that there is an interaction between three factors: sand ratio, FC fiber content and water reducer content. The degree of influence of the three factors on the 28 d flexural strength of FC fiber concrete is ranked as: FC fiber content ＞ water reducer content ＞ sand ratio. The optimum mixture ratio of FC fiber concrete is : sand ratio is 34%, FC fiber content is 1.4 kg/m3, water reducer content is 2%. The peak load and deflection at the inflection points of the P-δ curves of the three fibers were significantly higher, and the sharpness of the inflection points decreased. Compared to plain concrete, the fracture toughness of FC fiber, PVA fiber and PP fiber concrete increased by 125.8%、118.4% and 87.1%, respectively, the starting toughness increased by 38.7%、33.9% and 25.2%, respectively, the fracture toughness increased by 87.1%、73.2% and 55.6%, respectively, and the fracture energy increased by 216.2%、193.2% and 162.9%, respectively. Combined with the energy balance theory analysis, the fibers play a role in toughening and fracture resistance in concrete by means of energy transfer. All three kinds of fibers can improve the toughness and fracture properties of concrete, and FC fibers have a relatively significant effect on the toughness and fracture property enhancement of concrete.
通讯作者: *游庆龙,长安大学公路学院副教授、硕士研究生导师。2005年长沙理工大学道路与铁道工程专业本科毕业,2008年长安大学道路与铁道工程专业硕士毕业,2011年同济大学道路与机场工程专业博士毕业后到长安大学工作至今。目前主要从事道路材料、机场道面结构力学行为等方面的研究工作。先后主持国家级或省部级课题近20项,发表论文40余篇,包括Pavement Engineering、Construction and Building Materials、《交通运输工程学报》《土木工程学报》等。youqinglong0730@163.com
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2024, Vol. 38 
