Elalaoui Oussama
Department of Civil and Environmental Engineering, College of Engineering, Majmaah University, Al-Majmaah 11952, Saudi Arabia.
Civil Engineering Laboratory, National Engineering School of Tunis, University of El Manar, BP 37, Tunis 1002, Tunisia.
Polymers (Basel). 2023 Feb 21;15(5):1078. doi: 10.3390/polym15051078.
Recently, polymer concrete (PC) has been widely used in many civil engineering applications. PC shows superiority in major physical, mechanical, and fracture properties comparing to ordinary Portland cement concrete. Despite many suitable characteristics of thermosetting resins related to processing, the thermal resistance of polymer concrete composite is relatively low. This study aims to investigate the effect of incorporating short fibers on mechanical and fracture properties of PC under different ranges of high temperatures. Short carbon and polypropylene fibers were added randomly at a rate of 1 and 2% by the total weight of the PC composite. The exposure temperatures cycles were ranged between 23 to 250 °C. Various tests were conducted including flexure strength, elastic modulus, toughness, tensile crack opening, density, and porosity to evaluate the effect of addition of short fibers on fracture properties of PC. The results show that the inclusion of short fiber lead to an increase in the load carrying capacity of PC by an average of 24% and limits the crack propagation. On the other hand, the enhancement of fracture properties of based PC containing short fibers is vanished at high temperature (250 °C), but still more efficient than ordinary cement concrete. This work could lead to broader applications of polymer concrete exposed to high temperatures.
近年来，聚合物混凝土（PC）已广泛应用于许多土木工程领域。与普通硅酸盐水泥混凝土相比，PC在主要物理、力学和断裂性能方面表现出优越性。尽管热固性树脂在加工方面有许多合适的特性，但聚合物混凝土复合材料的耐热性相对较低。本研究旨在探讨在不同高温范围内加入短纤维对PC力学和断裂性能的影响。短碳纤维和聚丙烯纤维以PC复合材料总重量的1%和2%的比例随机添加。暴露温度循环范围为23至250°C。进行了各种测试，包括弯曲强度、弹性模量、韧性、拉伸裂纹开口、密度和孔隙率，以评估添加短纤维对PC断裂性能的影响。结果表明，短纤维的加入使PC的承载能力平均提高了24%，并限制了裂纹扩展。另一方面，含短纤维的基础PC在高温（250°C）下断裂性能的增强消失，但仍比普通水泥混凝土更有效。这项工作可能会导致聚合物混凝土在高温环境下有更广泛的应用。
