回收轮胎聚合物纤维混凝土高温损伤超声特性研究

doi:10.11896/cldb.21030318

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Abstract In order to study the influences of recycled tyre polymer fibers (RTPF) and high temperature treatment on the ultrasonic characteristics of concrete da-mage, this work applied the ultrasonic method to test the concrete specimen with various fiber dosages (0 kg/m³, 0.6 kg/m³, 1.2 kg/m³, 2.4 kg/m³, 4.8 kg/m³) under different temperature (20 ℃, 105 ℃, 250 ℃, 400 ℃, 600 ℃), and then analyzed the change rules of acoustic velocity, waveform, spectrogram and energy distribution when the ultrasonic wave passed through the concrete specimen. The experimental results indicate that after high temperature, there has been a decrease in the acoustic velocity and the amplitude of main frequency of concrete with different fiber dosages; meanwhile, the waveform is distorted and the energy of ultrasonic is concentrated in the low-frequency stage. The change trend of compressive strength of RTPF reinforced concrete is the same as the damage trend reflected by ultrasonic characteristics. After the temperature reaches the melting point of RTPF, the compressive strength and the acoustic velocity of RTPF concrete with 1.2 kg/m³ fiber dosages get the largest, and the proportion of ultrasonic energy in low frequency band gets the smallest; SEM test shows that RTPF softens and melts after high temperature treatment, which can improve the air permeability of concrete, reduce the pore steam pressure, and then make the high-temperature burst damage of concrete reduced. The research results can provide a reference for the study of high-temperature damage mechanism of RTPF reinforced concrete.

Key words： tyre fiber concrete high temperature ultrasonic wave damage

Published: 10 June 2022 Online: 2022-06-09

CLC number:

TU528.34

Fund:Natural Science Foundation of Liaoning Province (2020-MS-089), Special Funds for Basic Scientific Research Business in Central Universities (N2001005), and National College Students' Innovation and Entrepreneurship Training Program (S201910450028).

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	Articles by authors
	CHEN Meng
	YAN Xin
	CHEN Jiansong
	SUN Yingjie

Cite this article:

CHEN Meng,YAN Xin,CHEN Jiansong, et al. Study on Ultrasonic Characteristics of High Temperature Damage of Recycled Tyre Polymer Fiber Reinforced Concrete[J]. Materials Reports, 2022, 36(11): 21030318-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21030318 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21030318

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