Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures
Concrete has low porosity and compact microstructure, and thus can be vulnerable to high temperature, and the increasing application of various types of supplementary cementitious materials (SCMs) in concrete makes its high-temperature resistant behavior more complex. In this study, we investigate t...
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MDPI AG
2020-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/8/1833 |
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| author | Dong Lu Zhuo Tang Liang Zhang Jianwei Zhou Yue Gong Yaogang Tian Jing Zhong |
| author_facet | Dong Lu Zhuo Tang Liang Zhang Jianwei Zhou Yue Gong Yaogang Tian Jing Zhong |
| author_sort | Dong Lu |
| collection | DOAJ |
| description | Concrete has low porosity and compact microstructure, and thus can be vulnerable to high temperature, and the increasing application of various types of supplementary cementitious materials (SCMs) in concrete makes its high-temperature resistant behavior more complex. In this study, we investigate the effects of four formulations with typical SCMs combinations of fly ash (FA), ultra-fine fly ash (UFFA) and metakaolin (MK), and study the effects of SCMs combinations on the thermal performance, microstructure, and the crystalline and amorphous phases evolution of concrete subjected to high temperatures. The experimental results showed that at 400 °C, with the addition of 20% FA (wt %), the thermal conductivity of the sample slightly increased to 1.5 W/(m·K). Replacing FA with UFFA can further increase the thermal conductivity to 1.7 W/(m·K). Thermal conductivity of concrete slightly increased at 400 °C and significantly reduced at 800 °C. Further, combined usage of SCMs delayed and reduced micro-cracks of concrete subjected to high temperatures. This study demonstrates the potential of combining the usage of SCMs to promote the high-temperature performance of concrete and explains the micro-mechanism of concrete containing SCMs at high temperatures. |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T20:30:27Z |
| publishDate | 2020-04-01 |
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| spelling | doaj.art-dc8e6b587bac4ab0aca3e87f8dc487512023-11-19T21:29:18ZengMDPI AGMaterials1996-19442020-04-01138183310.3390/ma13081833Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High TemperaturesDong Lu0Zhuo Tang1Liang Zhang2Jianwei Zhou3Yue Gong4Yaogang Tian5Jing Zhong6Institute of Intelligent Manufacturing Technology, ShenZhen Polytechnic, ShenZhen 518055, ChinaInstitute of Intelligent Manufacturing Technology, ShenZhen Polytechnic, ShenZhen 518055, ChinaInstitute of Intelligent Manufacturing Technology, ShenZhen Polytechnic, ShenZhen 518055, ChinaSchool of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin 150000, ChinaConcrete has low porosity and compact microstructure, and thus can be vulnerable to high temperature, and the increasing application of various types of supplementary cementitious materials (SCMs) in concrete makes its high-temperature resistant behavior more complex. In this study, we investigate the effects of four formulations with typical SCMs combinations of fly ash (FA), ultra-fine fly ash (UFFA) and metakaolin (MK), and study the effects of SCMs combinations on the thermal performance, microstructure, and the crystalline and amorphous phases evolution of concrete subjected to high temperatures. The experimental results showed that at 400 °C, with the addition of 20% FA (wt %), the thermal conductivity of the sample slightly increased to 1.5 W/(m·K). Replacing FA with UFFA can further increase the thermal conductivity to 1.7 W/(m·K). Thermal conductivity of concrete slightly increased at 400 °C and significantly reduced at 800 °C. Further, combined usage of SCMs delayed and reduced micro-cracks of concrete subjected to high temperatures. This study demonstrates the potential of combining the usage of SCMs to promote the high-temperature performance of concrete and explains the micro-mechanism of concrete containing SCMs at high temperatures.https://www.mdpi.com/1996-1944/13/8/1833high-performance concretesupplementary cementitious materialshigh-temperature resistancethermal performancethermal conductivitymicrostructure |
| spellingShingle | Dong Lu Zhuo Tang Liang Zhang Jianwei Zhou Yue Gong Yaogang Tian Jing Zhong Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures Materials high-performance concrete supplementary cementitious materials high-temperature resistance thermal performance thermal conductivity microstructure |
| title | Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures |
| title_full | Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures |
| title_fullStr | Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures |
| title_full_unstemmed | Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures |
| title_short | Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures |
| title_sort | effects of combined usage of supplementary cementitious materials on the thermal properties and microstructure of high performance concrete at high temperatures |
| topic | high-performance concrete supplementary cementitious materials high-temperature resistance thermal performance thermal conductivity microstructure |
| url | https://www.mdpi.com/1996-1944/13/8/1833 |
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