Original scientific paper

https://doi.org/10.17559/TV-20190222023338

Impact Compression Test on Concrete after High-Temperature Treatment and Numerical Simulation of All Feasible Loading Rates

Yue Zhai ; School of Geology Engineering and Geomatics, Chang’an University, Room 311, No. 126 Yanta Road, No. 5 Teaching Building, 710064 Xi’an, Shaanxi Province, China
Yi Liu ; School of Geology Engineering and Geomatics, Chang’an University, Room 311, No. 126 Yanta Road, No. 5 Teaching Building, 710064 Xi’an, Shaanxi Province, China
Yubai Li ; School of Earth Sciences and Resources, China University of Geosciences, Room 630, No. 29 Xueyuan Road, Yifu Building, 100086 Beijing, China
Yan Li ; School of Geology Engineering and Geomatics, Chang’an University, Room 311, No. 126 Yanta Road, No. 5 Teaching Building, 710064 Xi’an, Shaanxi Province, China
Yunmei Shi ; School of Geology Engineering and Geomatics, Chang’an University, Room 311, No. 126 Yanta Road, No. 5 Teaching Building, 710064 Xi’an, Shaanxi Province, China
Ki-Il Song ; Department of Civil Engineering, Inha University, 100 Inha-ro, Nam-gu, 22002 Incheon, South Korea

Abstract

Concrete materials are important in infrastructure and national defence construction. These materials inevitably bear complicated loads, which include static load, high temperature, and high strain rate. Therefore, the dynamic responses and fragmentation of concrete under high temperatures and loading rates should be investigated. However, the compressive properties of rock materials under ultrahigh loading rates (>20 m/s) are difficult to investigate using the split Hopkinson pressure bar. Impact compression tests were conducted on concrete specimens processed at different temperatures (20-800 °C) under three loading rates in this study to discuss the variation law of the impact compression strength of concrete materials after high-temperature treatment. On this basis, numerical simulation was conducted on impact compression test under all feasible loading rates (10-110 m/s). The results demonstrate that the peak stress of all concrete specimens increases linearly with loading rate before 21 m/s and gradually decreases after 21 m/s. Peak stress shows an inverted V-shaped variation law. Moreover, the temperature-induced weakening effect exceeds the strengthening effect caused by loading rate with the increase in temperature. The growth of peak stress decreases considerably, especially under an ultrahigh loading rate (>50 m/s). These conclusions can provide theoretical references for the design of the ultimate strength of concrete materials for practical applications, such as fire and explosion prevention.

Keywords

concrete; high loading rate; numerical simulation; SHPB; thermal treatment

Hrčak ID:

221000

URI

https://hrcak.srce.hr/221000

Publication date:

12.6.2019.

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