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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (7): 2331-2340.

• Solid Waste and Eco-Materials • Previous Articles     Next Articles

Experimental Study on Basic Mechanical Properties of Recycled Tyre Steel Fiber Recycled Aggregate Concrete

FAN Xiaochun1, ZHANG Wenjing1, LIANG Tianfu2, CHEN Kaifeng1   

  1. 1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
    2. Construction Business Headquarters of Wuhan Metro, Wuhan 430000, China
  • Received:2021-02-17 Revised:2021-03-19 Online:2021-07-15 Published:2021-08-04

Abstract: The basic mechanical properties and damage modes of concrete are important indicators of the load-bearing capacity and toughness of the specimens under different stress conditions. To investigate the basic mechanical properties of recycled tyre steel fiber (RTSF) recycled aggregate concrete, 8 sets of concrete specimens of different types were designed for the test. The effects of RTSF volume fraction (0.25%, 0.5%, 0.75% and 1.0%) and recycled aggregate replacement rate(the mass fractions are 50%, 75% and 100%, respectively) on the basic mechanical properties and failure modes of concrete were systematically investigated by slump, gas content, cubic compressive, splitting tensile and flexural tests. The results show that with the increase of recycled aggregate replacement rate, the slump of concrete mixture decrease and the gas content increase, and the mechanical properties are reduced to different degrees. RTSF effectively improves the basic mechanical properties of recycled aggregate concrete, and the failure mode of the specimens shows obvious ductile damage characteristics with the increase of RTSF content. Comprehensive indicators, when the replacement rate of recycled aggregate is 50%, the mechanical properties of RTSF recycled aggregate concrete with RTSF volume content of 0.5% is the best. The cube compressive strength (28 d) of the specimens is only 1.0% lower than that of plain concrete, while the splitting tensile strength and flexural strength are 9.6% and 12.5% higher than that of plain concrete, respectively. In addition, the flexural toughness index I5, I10 and I20 of the concrete are 2.7 times, 3.8 times and 4.8 times of that of the plain concrete, respectively.

Key words: basic mechanical property, failure mode, recycled tyre steel fiber, recycled aggregate concrete, bending toughness index

CLC Number: