Abstract
The fractal characteristics and energy dissipation of basalt fiber reinforced concrete (BFRC) with five kinds of fiber volume contents (0.0%, 0.1%, 0.2%, 0.3%, 0.4%) after exposure to different temperatures (20 °C, 200 °C, 400 °C, 600 °C, 800 °C) under impact loading were investigated by using a 50 mm diameter split Hopkinson pressure bar (SHPB) apparatus. Scale-mass distribution rules and fractal dimension characteristics of fragments were studied based on the screening statistical method and the fractal theory. Furthermore, the relationship between the energy consumption density and the fractal dimension of fragments was established, and the effects of fiber content, temperature and impact velocity on fractal dimension and absorption energy were analyzed. The results show that the crushing severity of fragments and fractal dimension increase with the impact velocity under the same fiber content. The energy consumption density increases first and then decreases with increasing fiber content, and also decreases with increasing temperature. When the temperature and fiber content remain unchanged, the energy consumption density increases linearly with the increasing fractal dimension, and under the same impact velocity and temperature, there is no obvious linear relationship between energy consumption density and fractal dimension.
Highlights
Basalt fibers (BF) are produced from basalt rocks in the process of rock melting, gravitational leakage of molten basalt mass through holes in platinum boats and cooling
The basalt fiber reinforced concrete was cast in the shape of a 150 mm × 150 mm × 150 mm cube first, and 50 mm × 25 mm cylinder specimens were made from cubes through a coring and cutting
This phenomenon can be explained as follows: when the fiber content is less than 0.2%, basalt fibers are randomly distributed in the concrete and form a network, so it can prevent the appearance and development of microcracks, improve the toughness of concrete, but when the fiber content exceeds 0.2%, more basalt fibers tend to agglomerate in the concrete mixing process, and form pores in the concrete, stress concentration tends to occur around the pores under the action of external forces, resulting in the reduction in concrete strength and the ability to absorb energy
Summary
Basalt fibers (BF) are produced from basalt rocks in the process of rock melting, gravitational leakage of molten basalt mass through holes in platinum boats and cooling. The research on fractal characteristics and energy dissipation of BFRC after exposure to elevated temperatures under impact loading has an important theoretical value and practical significance. Tests on concrete under freeze-thaw cycle conditions and exposure to elevated temperature, respectively, and analyzed the fractal dimension, energy dissipation of fragments and the effect of factors. Ren studied the dynamic characteristics and fractal characteristics of BFRC after exposure to elevated temperature, and analyzed the factors affecting dynamic strength and fractal characteristics, such as strain rate, temperature, fiber content and porosity [16]. The above research did not study the relationship between the energy dissipation and the fractal characteristics of BFRC after exposure to elevated temperatures under impact loading. Based on the fractal theory and energy dissipation principles of SHPB test, the influences of fiber content, temperature and impact velocity on fractal dimension were analyzed, and the relationship between energy dissipation density and fractal dimension of BFRC was established
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