Uniaxial Dynamic Mechanical Properties Of Tunnel Lining Concrete Under Moderate-Low Strain Rate After High Temperature

Archives of civil engineering

L. X. Xiong Associate Prof., PhD., Eng., Ningbo University, Faculty of Architectural, Civil Engineering and Environment, Ningbo, Fenghua Road 818, PR ChinaEmailOther articles by this author:De Gruyter OnlineGoogle Scholar¹ 

[1] Associate Prof., PhD., Eng., Ningbo University, Faculty of Architectural, Civil Engineering and Environment, Ningbo, Fenghua Road 818, PR China

关键词: Keywords: concrete;    high temperature;    strain rate;    mechanical properties;   

DOI  :  10.1515/ace-2015-0013

学科分类：建筑学

来源: Polska Akademia Nauk * Instytut Podstawowych Problemow Techniki / Polish Academy of Sciences, Institute of Fundamental Technological Research

【 摘 要 】

To investigate the mechanical properties of tunnel lining concrete under different moderate-low strain rates after high temperatures, uniaxial compression tests in association with ultrasonic tests were performed. Test results show that the ultrasonic wave velocity and mass loss of concrete specimen begin to sharply drop after high temperatures of 600 °C and 400 °C, respectively, at the strain rates of 10-5s-1 to 10-2s-1. The compressive strength and elastic modulus of specimen increase with increasing strain rate after the same temperature, but it is difficult to obtain an evident change law of peak strain with increasing strain rate. The compressive strength of concrete specimen decreases first, and then increases, but decreases again in the temperatures ranging from room temperature to 800 °C at the strain rates of 10-5s-1 to 10-2s-1. It can be observed that the strain-rate sensitivity of compressive strength of specimen increases with increasing temperature. In addition, the peak strain also increases but the elastic modulus decreases substantially with increasing temperature under the same strain rate.

【 授权许可】

Unknown