Zhou Hao, Jia Bin, Huang Hui, Mou Yanling
Department of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621000, China.
Materials (Basel). 2020 Mar 17;13(6):1362. doi: 10.3390/ma13061362.
Blending a certain proportion of basalt fiber into concrete improves the toughness of concrete, which prevents cracking and avoids the brittle behaviors. In this paper, the compressive, tensile, and flexural tests of concrete with different basalt fiber contents were carried out. Then the test phenomena, failure modes, and mechanical properties were compared and analyzed to derive the relationship between the basalt fiber contents and mechanical properties. The toughness and crack resistance performance of basalt fiber reinforced concrete were evaluated by the fracture energy, advanced toughness parameters, and characteristic length proposed by Hillerborg. The correlation coefficient of basalt fiber was introduced to establish the calculation formula for mechanical properties of basalt fiber reinforced concrete. The results indicated that basalt fiber significantly improved the toughness and crack resistance performance of concrete. The enhancing effect of the basalt fiber on the compressive strength of concrete is lower than that of tensile strength and flexural strength. Moreover, the improvement effect was the highest with the basalt fiber content was 0.3% and 0.4%.
在混凝土中掺入一定比例的玄武岩纤维可提高混凝土的韧性，防止开裂并避免脆性破坏。本文对不同玄武岩纤维含量的混凝土进行了抗压、抗拉和抗弯试验。然后对试验现象、破坏模式和力学性能进行了比较和分析，以得出玄武岩纤维含量与力学性能之间的关系。通过断裂能、改进的韧性参数以及Hillerborg提出的特征长度对玄武岩纤维增强混凝土的韧性和抗裂性能进行了评估。引入玄武岩纤维的相关系数来建立玄武岩纤维增强混凝土力学性能的计算公式。结果表明，玄武岩纤维显著提高了混凝土的韧性和抗裂性能。玄武岩纤维对混凝土抗压强度的增强作用低于抗拉强度和抗弯强度。此外，当玄武岩纤维含量为0.3%和0.4%时，改善效果最佳。
