Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions
The coupling effect of moisture content and temperature on the elastic modulus of concrete is experimentally investigated. The elastic modulus of dry concrete exhibits a clear temperature-weakening effect, while the elastic modulus of wet concrete exhibits a water-strengthening effect at room temper...
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2023-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/15/5447 |
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| author | Ping Li Yanru Zhang Shiwei Duan Ruiyuan Huang Jiming Gu |
| author_facet | Ping Li Yanru Zhang Shiwei Duan Ruiyuan Huang Jiming Gu |
| author_sort | Ping Li |
| collection | DOAJ |
| description | The coupling effect of moisture content and temperature on the elastic modulus of concrete is experimentally investigated. The elastic modulus of dry concrete exhibits a clear temperature-weakening effect, while the elastic modulus of wet concrete exhibits a water-strengthening effect at room temperature. Under humidity-heat conditions, the elastic modulus of wet concrete declines with the temperature rise. When the temperature is 20 °C, 200 °C, 400 °C, 520 °C, and 620 °C, the humidity–heat coupling factors of the elastic modulus change rate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="normal">D</mi><mover accent="true"><mi mathvariant="normal">I</mi><mo>˙</mo></mover><mi mathvariant="normal">F</mi></mrow></semantics></math></inline-formula> with moisture content are 0.08, 0.07, 0.04, 0.01, and −0.03, respectively, and the declining rate increases with the rise of moisture content. The relation between the humidity-heat coupling factor DIF, moisture content, and temperature was established; The equivalent relation between the water-strengthening effect and the temperature-weakening effect of the elastic modulus was obtained. The temperature range of the strengthening effect and “apparent weakening effect” of water stored inside concrete before heating on elastic modulus was determined; The evolutionary mechanism of the competition between the microcrack expansion and healing of concrete under combined humidity and heat conditions was revealed. |
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| format | Article |
| id | doaj.art-5809f3c036ba44b4b3640c6bf7ce9659 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:22:22Z |
| publishDate | 2023-08-01 |
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| spelling | doaj.art-5809f3c036ba44b4b3640c6bf7ce96592023-11-18T23:13:27ZengMDPI AGMaterials1996-19442023-08-011615544710.3390/ma16155447Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat ConditionsPing Li0Yanru Zhang1Shiwei Duan2Ruiyuan Huang3Jiming Gu4School of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, ChinaSchool of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, ChinaSchool of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, ChinaCollege of Civil Engineering, Fuzhou University, Fuzhou 350116, ChinaSchool of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, ChinaThe coupling effect of moisture content and temperature on the elastic modulus of concrete is experimentally investigated. The elastic modulus of dry concrete exhibits a clear temperature-weakening effect, while the elastic modulus of wet concrete exhibits a water-strengthening effect at room temperature. Under humidity-heat conditions, the elastic modulus of wet concrete declines with the temperature rise. When the temperature is 20 °C, 200 °C, 400 °C, 520 °C, and 620 °C, the humidity–heat coupling factors of the elastic modulus change rate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="normal">D</mi><mover accent="true"><mi mathvariant="normal">I</mi><mo>˙</mo></mover><mi mathvariant="normal">F</mi></mrow></semantics></math></inline-formula> with moisture content are 0.08, 0.07, 0.04, 0.01, and −0.03, respectively, and the declining rate increases with the rise of moisture content. The relation between the humidity-heat coupling factor DIF, moisture content, and temperature was established; The equivalent relation between the water-strengthening effect and the temperature-weakening effect of the elastic modulus was obtained. The temperature range of the strengthening effect and “apparent weakening effect” of water stored inside concrete before heating on elastic modulus was determined; The evolutionary mechanism of the competition between the microcrack expansion and healing of concrete under combined humidity and heat conditions was revealed.https://www.mdpi.com/1996-1944/16/15/5447concrete elastic modulustemperature effectwater effecthumidity–heat coupling factor |
| spellingShingle | Ping Li Yanru Zhang Shiwei Duan Ruiyuan Huang Jiming Gu Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions Materials concrete elastic modulus temperature effect water effect humidity–heat coupling factor |
| title | Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions |
| title_full | Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions |
| title_fullStr | Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions |
| title_full_unstemmed | Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions |
| title_short | Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions |
| title_sort | variation pattern of the elastic modulus of concrete under combined humidity and heat conditions |
| topic | concrete elastic modulus temperature effect water effect humidity–heat coupling factor |
| url | https://www.mdpi.com/1996-1944/16/15/5447 |
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