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.
作者简介: 陈猛,东北大学资源与土木工程学院副教授,分别于2004年、2008年和2011年在武汉理工大学获得学士、硕士和博士学位。主要研究方向为超高性能混凝土、纤维混凝土动态力学性能及增强增韧机理、钢与混凝土组合结构。发表学术论文30余篇,包括Cement and Concrete Composites、 Construction and Building Materials、《工程力学》等。
引用本文:
陈猛, 颜鑫, 陈建淞, 孙影杰. 回收轮胎聚合物纤维混凝土高温损伤超声特性研究[J]. 材料导报, 2022, 36(11): 21030318-6.
CHEN Meng, YAN Xin, CHEN Jiansong, SUN Yingjie. Study on Ultrasonic Characteristics of High Temperature Damage of Recycled Tyre Polymer Fiber Reinforced Concrete. Materials Reports, 2022, 36(11): 21030318-6.
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2022, Vol. 36 
