Study on fractal dimension and mechanical properties of basalt polypropylene fiber concrete pore structure

doi:10.19936/j.cnki.2096-8000.20230828.012

Abstract

Abstract: Based on the experiments, the influence of basalt-polypropylene fiber on the compressive strength and splitting tensile strength of concrete is discussed. The fractal dimension of concrete pore structure is calculated by using the fractal model of optical method. The experimental results show that hybrid fibers can improve the compressive strength and splitting tensile strength of concrete. When the content of basalt fiber (BF) and polypropylene fiber (PF) was 0.05%, the synergistic effect of hybrid fiber was the strongest. The maximum increment of compressive strength and splitting tensile strength is 5.97% and 8.46% respectively. However, when the fiber content is too high, the hybrid fiber will adversely affect the mechanical properties of specimens. The pore structure of basalt-polypropylene fiber reinforced concrete (BPFRC) shows obvious fractal characteristics, and its fractal dimension ranges between 2.297 and 2.482. Fractal dimension has a strong correlation with porosity and spacing coefficient. The fractal dimension decreases significantly with the increase of porosity and increases with the increase of spacing coefficient. Fractal dimension is positively correlated with compressive strength and splitting tensile strength. Therefore, the fractal dimension of pore structure can be used to evaluate the micro pore structure of concrete and reflect the influence of the complexity of pore structure on the macroscopic mechanical properties of concrete.

Key words: basalt fiber, polypropylene fiber, hybrid fiber reinforced concrete, mechanical properties, pore structure, fractal dimension, composites

CLC Number:

TB332

ZHAO Jing, LI Xiaofeng, GUO Li. Study on fractal dimension and mechanical properties of basalt polypropylene fiber concrete pore structure[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(8): 78-84.

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