Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions
Polypropylene (PP) concrete, a kind of high-performance fiber-reinforced concrete, is widely used in large concrete structures. Studies on the dynamic mechanical properties of polypropylene concrete under temperature–impact load can provide a theoretical basis for research on the structural stabilit...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/3/1482 |
| _version_ | 1797489085896458240 |
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| author | Rui Li Lei Liu Huaming An Ya Wang |
| author_facet | Rui Li Lei Liu Huaming An Ya Wang |
| author_sort | Rui Li |
| collection | DOAJ |
| description | Polypropylene (PP) concrete, a kind of high-performance fiber-reinforced concrete, is widely used in large concrete structures. Studies on the dynamic mechanical properties of polypropylene concrete under temperature–impact load can provide a theoretical basis for research on the structural stability of concrete structures during fires, explosions, and other disasters. The purpose of this paper was to study the dynamic mechanical properties of polypropylene concrete under real-time high-temperature conditions and to establish a dynamic damage constitutive model for polypropylene concrete under real-time high-temperature conditions. In this paper, Split Hopkinson Pressure Bar (SHPB) equipment was used to test the dynamic mechanical properties of polypropylene concrete with different high strain rates under different real-time high temperatures (room temperature, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C). A modified “Z-W-T” model was used to determine the recursion of the dynamic damage constitutive model of polypropylene concrete under different temperature–impact loads, and the model was compared with the experimental data. The results show that the thermal conditions influenced the chemical composition and microstructure of the polypropylene fiber concrete, which was why the high temperatures had a strong influence on the dynamic mechanical properties of polypropylene concrete. When the heating temperature exceeded 300 °C, although the polypropylene concrete specimen was still able to maintain a certain strength, the dynamic mechanical properties showed a deterioration trend as the temperature increased. The comparation between the experimental data and the fitting curve of the dynamic damage constitutive model showed that the dynamic stress–strain curves could be well matched with the fitting curves of the dynamic damage constitutive model, meaning that this model could describe the dynamic mechanical properties of polypropylene concrete under different real-time high temperatures well. |
| first_indexed | 2024-03-10T00:12:27Z |
| format | Article |
| id | doaj.art-ce4c979e05914ce188cfc3befb1f4cdf |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T00:12:27Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-ce4c979e05914ce188cfc3befb1f4cdf2023-11-23T15:58:19ZengMDPI AGApplied Sciences2076-34172022-01-01123148210.3390/app12031482Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature ConditionsRui Li0Lei Liu1Huaming An2Ya Wang3Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaulty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaPolypropylene (PP) concrete, a kind of high-performance fiber-reinforced concrete, is widely used in large concrete structures. Studies on the dynamic mechanical properties of polypropylene concrete under temperature–impact load can provide a theoretical basis for research on the structural stability of concrete structures during fires, explosions, and other disasters. The purpose of this paper was to study the dynamic mechanical properties of polypropylene concrete under real-time high-temperature conditions and to establish a dynamic damage constitutive model for polypropylene concrete under real-time high-temperature conditions. In this paper, Split Hopkinson Pressure Bar (SHPB) equipment was used to test the dynamic mechanical properties of polypropylene concrete with different high strain rates under different real-time high temperatures (room temperature, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C). A modified “Z-W-T” model was used to determine the recursion of the dynamic damage constitutive model of polypropylene concrete under different temperature–impact loads, and the model was compared with the experimental data. The results show that the thermal conditions influenced the chemical composition and microstructure of the polypropylene fiber concrete, which was why the high temperatures had a strong influence on the dynamic mechanical properties of polypropylene concrete. When the heating temperature exceeded 300 °C, although the polypropylene concrete specimen was still able to maintain a certain strength, the dynamic mechanical properties showed a deterioration trend as the temperature increased. The comparation between the experimental data and the fitting curve of the dynamic damage constitutive model showed that the dynamic stress–strain curves could be well matched with the fitting curves of the dynamic damage constitutive model, meaning that this model could describe the dynamic mechanical properties of polypropylene concrete under different real-time high temperatures well.https://www.mdpi.com/2076-3417/12/3/1482polypropylene concretereal-time high temperatureSHPBconstitutive modeldynamic mechanical properties |
| spellingShingle | Rui Li Lei Liu Huaming An Ya Wang Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions Applied Sciences polypropylene concrete real-time high temperature SHPB constitutive model dynamic mechanical properties |
| title | Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions |
| title_full | Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions |
| title_fullStr | Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions |
| title_full_unstemmed | Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions |
| title_short | Study on Dynamic Constitutive Model of Polypropylene Concrete under Real-Time High-Temperature Conditions |
| title_sort | study on dynamic constitutive model of polypropylene concrete under real time high temperature conditions |
| topic | polypropylene concrete real-time high temperature SHPB constitutive model dynamic mechanical properties |
| url | https://www.mdpi.com/2076-3417/12/3/1482 |
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