Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures
In view of the devastating outcomes of fires and explosions, it is imperative to research the dynamic responses of concrete structures at high temperatures. For this purpose, the effects of the strain rate and high temperatures on the dynamic tension behavior and energy characteristics of high-stren...
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MDPI AG
2020-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/23/5313 |
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| author | Nao Lv Hai-bo Wang Qi Zong Meng-xiang Wang Bing Cheng |
| author_facet | Nao Lv Hai-bo Wang Qi Zong Meng-xiang Wang Bing Cheng |
| author_sort | Nao Lv |
| collection | DOAJ |
| description | In view of the devastating outcomes of fires and explosions, it is imperative to research the dynamic responses of concrete structures at high temperatures. For this purpose, the effects of the strain rate and high temperatures on the dynamic tension behavior and energy characteristics of high-strength concrete were investigated in this paper. Dynamic tests were conducted on high-strength concrete after exposure to the temperatures of 200, 400, and 600 °C by utilizing a 74 mm diameter split Hopkinson pressure bar (SHPB) apparatus. We found that the quasi-static and dynamic tensile strength of high-strength concrete gradually decreased and that the damage degree rose sharply with the rise of temperature. The dynamic tensile strength and specific energy absorption of high-strength concrete had a significant strain rate effect. The crack propagation law gradually changed from directly passing through the coarse aggregate to extending along the bonding surface between the coarse aggregate and the mortar matrix with the elevation of temperature. When designing the material ratio, materials with high-temperature resistance and high tensile strength should be added to strengthen the bond between the mortar and the aggregate and to change the failure mode of the structure to resist the softening effect of temperature. |
| first_indexed | 2024-03-10T14:37:26Z |
| format | Article |
| id | doaj.art-f15c064d6b7b4416bcac389f44c9a98b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:37:26Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f15c064d6b7b4416bcac389f44c9a98b2023-11-20T22:07:53ZengMDPI AGMaterials1996-19442020-11-011323531310.3390/ma13235313Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated TemperaturesNao Lv0Hai-bo Wang1Qi Zong2Meng-xiang Wang3Bing Cheng4State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Mine, Anhui University of Science &Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Mine, Anhui University of Science &Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Mine, Anhui University of Science &Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Mine, Anhui University of Science &Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Mine, Anhui University of Science &Technology, Huainan 232001, ChinaIn view of the devastating outcomes of fires and explosions, it is imperative to research the dynamic responses of concrete structures at high temperatures. For this purpose, the effects of the strain rate and high temperatures on the dynamic tension behavior and energy characteristics of high-strength concrete were investigated in this paper. Dynamic tests were conducted on high-strength concrete after exposure to the temperatures of 200, 400, and 600 °C by utilizing a 74 mm diameter split Hopkinson pressure bar (SHPB) apparatus. We found that the quasi-static and dynamic tensile strength of high-strength concrete gradually decreased and that the damage degree rose sharply with the rise of temperature. The dynamic tensile strength and specific energy absorption of high-strength concrete had a significant strain rate effect. The crack propagation law gradually changed from directly passing through the coarse aggregate to extending along the bonding surface between the coarse aggregate and the mortar matrix with the elevation of temperature. When designing the material ratio, materials with high-temperature resistance and high tensile strength should be added to strengthen the bond between the mortar and the aggregate and to change the failure mode of the structure to resist the softening effect of temperature.https://www.mdpi.com/1996-1944/13/23/5313high-strength concreteelevated temperaturesplitting tensile strengthfracture characteristicenergy characteristic |
| spellingShingle | Nao Lv Hai-bo Wang Qi Zong Meng-xiang Wang Bing Cheng Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures Materials high-strength concrete elevated temperature splitting tensile strength fracture characteristic energy characteristic |
| title | Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures |
| title_full | Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures |
| title_fullStr | Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures |
| title_full_unstemmed | Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures |
| title_short | Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures |
| title_sort | dynamic tensile properties and energy dissipation of high strength concrete after exposure to elevated temperatures |
| topic | high-strength concrete elevated temperature splitting tensile strength fracture characteristic energy characteristic |
| url | https://www.mdpi.com/1996-1944/13/23/5313 |
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