Impact Compression Properties of Recycled Tyre Steel Fiber Reinforced Concrete Based on Fractal Theory

doi:10.12068/j.issn.1005-3026.2022.02.016

Abstract

Abstract: In order to study the impact compression properties of recycled tire steel fiber(RTSF) reinforced concrete， the impact compression tests of general concrete(F 0)， industrial steel fiber(ISF)reinforced concrete and RTSF reinforced concrete were carried out by using split Hopkinson pressure bar. The crushed specimens were sieved and fractal dimensions were calculated. The results indicate that the impact failure modes of RTSF reinforced concrete can be divided into three types: peripheral tensile strain failure， core retaining failure and overall failure. The fractal dimension of RTSF reinforced concrete ranges between 1.33 and 2.25 under strain rates of 55 to 125s^-1. The fractal dimension decreases and then increases with the increase of RTSF content. The fractal dimension of RTSF 0.75 reinforced concrete is minimal. The fractal dimension of concrete reinforced with various fiber contents increases with the increase of strain rates. Under different strain rates， the dynamic compressive strength and fracture energy of RTSF reinforced concrete enhance with the increase of fractal dimension. The fractal dimension， dynamic compressive strength and fracture energy of concrete reinforced with ISF 1.00 are between those of concrete reinforced with RTSF 0.75 and RTSF 1.00.In terms of impact compression， RTSF 0.75 outperforms ISF 1.00 (the fiber length is 35mm and the aspect ratio is 65).

Key words: fiber reinforced concrete; recycled tyre steel fiber; split Hopkinson pressure bar; fractal dimension; impact compression

CLC Number:

TU528.572

CHEN Meng， WANG Yu-ting， TAO Yun-xiao， WANG Hao. Impact Compression Properties of Recycled Tyre Steel Fiber Reinforced Concrete Based on Fractal Theory[J]. Journal of Northeastern University(Natural Science), 2022, 43(2): 266-273.

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