Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures
Autoclaved aerated concrete (AAC) has been extensively studied and applied in the past decades because of its excellent thermal insulation and acoustic performance, energy efficiency, and outstanding structural performance. To investigate the deterioration characteristics of AAC under high temperatu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-03-01
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| Series: | High Temperature Materials and Processes |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/htmp-2022-0301 |
| _version_ | 1797229660704079872 |
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| author | Tang Lingxiao Yao Huayan Zhang Mingyuan Gan Jiarui Xie Mingyu Xie Wansheng |
| author_facet | Tang Lingxiao Yao Huayan Zhang Mingyuan Gan Jiarui Xie Mingyu Xie Wansheng |
| author_sort | Tang Lingxiao |
| collection | DOAJ |
| description | Autoclaved aerated concrete (AAC) has been extensively studied and applied in the past decades because of its excellent thermal insulation and acoustic performance, energy efficiency, and outstanding structural performance. To investigate the deterioration characteristics of AAC under high temperatures, the physico-mechanical properties of AAC at different temperatures were tested by mass loss, wave velocity, and compressive tests, and the deterioration mechanism was discussed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) tests. The results showed that after exposure to elevated temperatures, the parameters of apparent form, mass loss, wave velocity, and compressive strength underwent remarkable conversions. It was observed that the ultrasonic behavior of AAC was affected at high temperatures as it increased at 100°C and decreased beyond 100°C. In addition, the compressive strength exhibited a two-stage transformation, slightly increased from ambient temperature to 300°C, and exhibited a rapid reduction beyond 300°C. At 900°C, the specimen lost its strength. By XRD, TGA, and SEM, it was confirmed that a series of physicochemical changes in AAC, such as the water escape and evaporation, decomposition of calcium silicate hydrate and calcium carbonate, and structural damage, were the primary reasons for the deterioration of the physical and mechanical properties at elevated temperatures. |
| first_indexed | 2024-04-24T15:16:08Z |
| format | Article |
| id | doaj.art-6dd0d6060c2c460283864b47221fbfe3 |
| institution | Directory Open Access Journal |
| issn | 2191-0324 |
| language | English |
| last_indexed | 2024-04-24T15:16:08Z |
| publishDate | 2024-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | High Temperature Materials and Processes |
| spelling | doaj.art-6dd0d6060c2c460283864b47221fbfe32024-04-02T09:20:07ZengDe GruyterHigh Temperature Materials and Processes2191-03242024-03-01431pp. 32132910.1515/htmp-2022-0301Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperaturesTang Lingxiao0Yao Huayan1Zhang Mingyuan2Gan Jiarui3Xie Mingyu4Xie Wansheng5School of Civil Engineering, Hefei University of Technology, Hefei230009, ChinaSchool of Civil Engineering, Hefei University of Technology, Hefei230009, ChinaSchool of Civil Engineering, Hefei University of Technology, Hefei230009, ChinaSchool of Civil Engineering, Hefei University of Technology, Hefei230009, ChinaSchool of Civil Engineering, Hefei University of Technology, Hefei230009, ChinaSchool of Civil Engineering, Hefei University of Technology, Hefei230009, ChinaAutoclaved aerated concrete (AAC) has been extensively studied and applied in the past decades because of its excellent thermal insulation and acoustic performance, energy efficiency, and outstanding structural performance. To investigate the deterioration characteristics of AAC under high temperatures, the physico-mechanical properties of AAC at different temperatures were tested by mass loss, wave velocity, and compressive tests, and the deterioration mechanism was discussed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) tests. The results showed that after exposure to elevated temperatures, the parameters of apparent form, mass loss, wave velocity, and compressive strength underwent remarkable conversions. It was observed that the ultrasonic behavior of AAC was affected at high temperatures as it increased at 100°C and decreased beyond 100°C. In addition, the compressive strength exhibited a two-stage transformation, slightly increased from ambient temperature to 300°C, and exhibited a rapid reduction beyond 300°C. At 900°C, the specimen lost its strength. By XRD, TGA, and SEM, it was confirmed that a series of physicochemical changes in AAC, such as the water escape and evaporation, decomposition of calcium silicate hydrate and calcium carbonate, and structural damage, were the primary reasons for the deterioration of the physical and mechanical properties at elevated temperatures.https://doi.org/10.1515/htmp-2022-0301autoclaved aerated concretetemperaturecompressive strengthmicrostructuredeterioration mechanism |
| spellingShingle | Tang Lingxiao Yao Huayan Zhang Mingyuan Gan Jiarui Xie Mingyu Xie Wansheng Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures High Temperature Materials and Processes autoclaved aerated concrete temperature compressive strength microstructure deterioration mechanism |
| title | Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures |
| title_full | Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures |
| title_fullStr | Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures |
| title_full_unstemmed | Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures |
| title_short | Experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures |
| title_sort | experimental investigation on the deterioration of the physical and mechanical properties of autoclaved aerated concrete at elevated temperatures |
| topic | autoclaved aerated concrete temperature compressive strength microstructure deterioration mechanism |
| url | https://doi.org/10.1515/htmp-2022-0301 |
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