Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin
In this study, the influence of the physicochemical properties and proportioning conditions of metakaolin on the mechanical properties of the synthesized metakaolin geopolymers was comprehensively evaluated, and the issue of the reaction control mechanism for the formation of mechanical properties d...
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| Format: | Article |
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MDPI AG
2024-01-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/17/2/367 |
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| author | Chao Cui Yingze Dang Chenguang Luo Lan Wang Hui Peng |
| author_facet | Chao Cui Yingze Dang Chenguang Luo Lan Wang Hui Peng |
| author_sort | Chao Cui |
| collection | DOAJ |
| description | In this study, the influence of the physicochemical properties and proportioning conditions of metakaolin on the mechanical properties of the synthesized metakaolin geopolymers was comprehensively evaluated, and the issue of the reaction control mechanism for the formation of mechanical properties during the synthesis of geopolymers was addressed. The reaction mechanism was analyzed by SEM and FTIR, and the kinetic analysis of the geopolymerization process was carried out using isothermal calorimetry combined with the Jander model. The test results show that the physicochemical properties of the metakaolin and the proportioning conditions together affect the mechanical properties of the geopolymer, with the correlation between the active aluminum content of the metakaolin and the strength of the geopolymer reaching over 0.87. The early stages of the geopolymerization reaction are all controlled by nucleation–growth mechanisms (<i>N</i> < 1), and the variability in control mechanisms is mainly found in the later stages of the geopolymerization reaction. The low reactivity and slow exothermic hydration of metakaolin are more inclined to the nucleation-growth mechanism responsible for the hydration process due to the large amount of encapsulation. |
| first_indexed | 2024-03-08T10:43:00Z |
| format | Article |
| id | doaj.art-261f68d6634c408b9e2caf1f8095ceb5 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T10:43:00Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-261f68d6634c408b9e2caf1f8095ceb52024-01-26T17:26:58ZengMDPI AGMaterials1996-19442024-01-0117236710.3390/ma17020367Mechanical Properties and Reaction Kinetics of Alkali-Activated MetakaolinChao Cui0Yingze Dang1Chenguang Luo2Lan Wang3Hui Peng4Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaKey Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia University of Technology, Hohhot 010051, ChinaKey Laboratory of Bridge Engineering Safety Control, Ministry of Education, Changsha University of Technology, Changsha 410114, ChinaIn this study, the influence of the physicochemical properties and proportioning conditions of metakaolin on the mechanical properties of the synthesized metakaolin geopolymers was comprehensively evaluated, and the issue of the reaction control mechanism for the formation of mechanical properties during the synthesis of geopolymers was addressed. The reaction mechanism was analyzed by SEM and FTIR, and the kinetic analysis of the geopolymerization process was carried out using isothermal calorimetry combined with the Jander model. The test results show that the physicochemical properties of the metakaolin and the proportioning conditions together affect the mechanical properties of the geopolymer, with the correlation between the active aluminum content of the metakaolin and the strength of the geopolymer reaching over 0.87. The early stages of the geopolymerization reaction are all controlled by nucleation–growth mechanisms (<i>N</i> < 1), and the variability in control mechanisms is mainly found in the later stages of the geopolymerization reaction. The low reactivity and slow exothermic hydration of metakaolin are more inclined to the nucleation-growth mechanism responsible for the hydration process due to the large amount of encapsulation.https://www.mdpi.com/1996-1944/17/2/367metakaolingeopolymermechanical propertiesreaction kinetics |
| spellingShingle | Chao Cui Yingze Dang Chenguang Luo Lan Wang Hui Peng Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin Materials metakaolin geopolymer mechanical properties reaction kinetics |
| title | Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin |
| title_full | Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin |
| title_fullStr | Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin |
| title_full_unstemmed | Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin |
| title_short | Mechanical Properties and Reaction Kinetics of Alkali-Activated Metakaolin |
| title_sort | mechanical properties and reaction kinetics of alkali activated metakaolin |
| topic | metakaolin geopolymer mechanical properties reaction kinetics |
| url | https://www.mdpi.com/1996-1944/17/2/367 |
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