A Comparative Study of the Mechanical Properties of Basalt Fiber and Basalt Grille Reinforced Concrete Composites and Theoretical Prediction

ABSTRACT

In this study, the chopped basalt fiber (CBF) with different content and basalt fiber grilles (BFG) with different layers were composed with concrete matrix, respectively. The compressive, splitting tensile and flexural properties of concrete composites were studied by universal material testing machine. The cracks evolution law of specimens was analyzed to reveal the reinforcement mechanism of CBF and BFG. Results showed that under the same fiber volume ratio, BFG were better than CBF to reinforce mechanical properties of concrete. The three kinds of mechanical properties of BFG reinforced concrete were improved highest by 41.46%, 28.26% and 46.13%, respectively. BFG can play a crucial role in stress transmission, bearing load and absorbing energy during the loading process of the specimens. Based on the equivalent stress rectangle theory, an analytic model to predict the ultimate flexural capacity of BFG reinforced concrete was proposed. The experimental results from the flexural test were compared with the predicted values, and a good accuracy of the analytic model was obtained.

摘要

在这项研究, 不同含量的短切玄武岩纤维(CBF)和不同层数的玄武岩纤维格栅(BFG)分别与混凝土基体进行复合。通过万能材料试验机研究了混凝土复合材料的压缩, 劈裂拉伸和弯曲性能。结果表明在相同的纤维体积率下, BFG对混凝土力学性能的增强效果比CBF强。BFG增强混凝土的三种力学性能分别最多能够提高41.46%, 28.26%和46.13%。在混凝土试件承载过程中, BFG能够起到应力传递, 承担载荷和吸收能量的关键作用。基于等效应力矩形梁理论, 本文提出了一种解析模型用来预测BFG增强混凝土的极限抗弯承载力。抗弯性能的实验结果与预测结果进行了比较, 表明解析模型的预测结果具有一个良好的准确性。

KEYWORDS:

• Chopped basalt fiber
• basalt fiber grille
• concrete composites
• mechanical property
• reinforcement mechanism
• theoretical prediction

关键词:

• 短切玄武岩纤维
• 玄武岩纤维格栅
• 混凝土复合材料
• 力学性能
• 增强机理
• 理论预测

Disclosure statement

The authors declare no conflict of interest.

Additional information

Funding

This work was financially supported by the National Key Research and Development Program of China (Grant No.2016YFB0303200) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX20_1785).