Composition design and performance of alkali-activated cements
Article
Article Title | Composition design and performance of alkali-activated cements |
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ERA Journal ID | 4258 |
Article Category | Article |
Authors | Li, Ning (Author), Shi, Caijun (Author), Wang, Qing (Author), Zhang, Zuhua (Author) and Ou, Zhihua (Author) |
Journal Title | Materials and Structures |
Journal Citation | 50, pp. 1-11 |
Article Number | 178 |
Number of Pages | 11 |
Year | 2017 |
Place of Publication | Netherlands |
ISSN | 1359-5997 |
1871-6873 | |
Digital Object Identifier (DOI) | https://doi.org/10.1617/s11527-017-1048-0 |
Web Address (URL) | https://link.springer.com/article/10.1617/s11527-017-1048-0 |
Abstract | In the present work, the relationship between the composition of the SiO2–Al2O3–CaO precursor system and the setting time, microstructure and mechanical properties of the resulting alkali-activated cement (AAC) were investigated. The results showed that with the increase of metakaolin content and the modulus of activator solution, setting time of alkali-activated cements was prolonged. The compressive strength increased with the increase of CaO content to a certain extent, but had different trends as Si/Al ratio varied. Microstructural analyses revealed that CaO content had remarkable effects on the microstructure of AAC. In calcium-free system, the strength was dependent on the three-dimensional structure of N–A–S–H gels. As the CaO content increased gradually, the main activation product changed from N–A–S–H to C–(A)–S–H gel, resulting in a more compact structure. This investigation helps to build up a practical approach for the composition design of alkali-activated cements. |
Keywords | Alkali-activation; SiO2-Al2O3-CaO system; Composition design; Setting time; Strength; Microstructure |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Byline Affiliations | Hunan University, China |
Northeastern University, China | |
Centre for Future Materials | |
Hunan University of Technology, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q587v/composition-design-and-performance-of-alkali-activated-cements
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