Mohamed Sameh, Elemam Hesham, Seleem Mohamed H, Sallam Hossam El-Din M
Materials Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, 44519, Egypt.
Civil and Environmental Engineering Departement, University of Missouri, Columbia, MO, 65202, USA.
Sci Rep. 2024 Feb 22;14(1):4346. doi: 10.1038/s41598-024-54763-w.
In this paper, an experimental study was conducted to examine the static and dynamic behaviors of rubberized fiber-reinforced concrete (RFRC). Crumb rubber was partially replaced from sand at volume fractions of 0%, 5%, 10%, 15%, and 20%. Steel fibers (SFs) with fiber volume fractions (Vf%) of 0%, 0.5%, 1%, and 1.5% were used for the production of FRCs, while polypropylene fiber (PPF) with Vf% = 0.4% was adopted to produce others FRCs. A combination of 0.4% PPF and 1% SF was used for hybrid FRC. The static properties were evaluated through compression, indirect tension, and flexural tests. However, the drop weight impact test was conducted to assess the dynamic property by estimating the impact energy. It was observed that the replacement of sand with rubber reduced all mechanical properties of concrete. In the case of RFRC, a reduction in compressive strength, compared to samples without fibers, was noted, and this reduction increased with higher Vf%. Both toughness indices and fracture energy were affected slightly by increasing rubber percentages while markedly increased with higher Vf%. However, adding rubber and/or fibers enhanced the impact energy of concrete.
本文进行了一项试验研究，以考察橡胶化纤维增强混凝土（RFRC）的静态和动态性能。以0%、5%、10%、15%和20%的体积分数用橡胶颗粒部分替代砂。使用纤维体积分数（Vf%）为0%、0.5%、1%和1.5%的钢纤维（SFs）来制备纤维增强混凝土（FRC），同时采用Vf% = 0.4%的聚丙烯纤维（PPF）来制备其他FRC。采用0.4%的PPF和1%的SF组合来制备混杂纤维增强混凝土（FRC）。通过抗压、间接拉伸和弯曲试验评估静态性能。然而，通过估计冲击能量进行落锤冲击试验来评估动态性能。观察到用橡胶替代砂会降低混凝土的所有力学性能。在RFRC的情况下，与无纤维的样品相比，抗压强度有所降低，且随着Vf%的增加这种降低幅度增大。随着橡胶含量的增加，韧性指数和断裂能受影响较小，而随着Vf%的增加显著增大。然而，添加橡胶和/或纤维会提高混凝土的冲击能量。
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