Dynamic and Static Mechanical Properties and Microstructure of Frozen Shaft Lining Imitation Steel Fiber Reinforced Concrete

Abstract

Abstract: In order to improve the brittleness characteristics of high-strength concrete in frozen shaft lining, and improve its crack resistance and toughness, the imitation steel fiber reinforced concrete was proposed as lining building material of frozen shaft lining. Through the optimization of materials and orthogonal tests, theimitation steel fiber reinforced high-performance concrete with different mixing ratios was obtained, and the static and dynamic mechanical properties and microstructure were experimentally studied. The results show that the tensile and flexural strength of concrete is increased by 29.46% and 26.72%, and its brittle characteristics are significantly improved by adding 15% (mass fraction) fly ash and 0.54% (volume fraction) polypropylene imitation steel fiber (PPTF) to the benchmark concrete. Compared with the benchmark group, the toughness of imitation steel fiber reinforced concrete with the best mix ratio is significantly enhanced, the toughness index increases by 40.83% in the strain range of 0~0.012, and the failure patterns after failure is more complete. The addition of PPTF and fly ash effectively inhibits the generation and expansion of micro-cracks in frozen shaft lining concrete, and the concrete shows a denser microstructure and higher macroscopic mechanical properties.

Key words: shaft lining concrete, imitation steel fiber, orthogonal test, strength, dynamic mechanics, microstructure

CLC Number:

TU528
TD262

WANG Rui, YAO Zhishu, FANG Yu, WANG Jiaqi. Dynamic and Static Mechanical Properties and Microstructure of Frozen Shaft Lining Imitation Steel Fiber Reinforced Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2835-2847.

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