Chemical deformation of metakaolin based geopolymer
By Zhenming Li, Shizhe Zhang, Yibing Zuo, Wei Chen, Guang Ye. Cement and Concrete Research, 2019
209 citations recorded by the source corpus.
Abstract Chemical deformation (chemical shrinkage/expansion), the absolute volume change during reactions, is a key parameter influencing the volume stability, especially the autogenous deformation of a binder material. This work, for the first time, reports an in-depth investigation on the chemical deformation of metakaolin based geopolymer (MKG). Unlike ordinary Portland cement-based binders with monotonic chemical shrinkage, MKG experiences three stages of chemical deformations: chemical shrinkage in the first stage, chemical expansion afterward and chemical shrinkage again in the final stage. Various experimental techniques (XRD, FTIR and NMR) plus theoretical calculations are applied to explore the mechanisms behind the chemical deformation of MKG. Clear correlations are found between the chemical deformations and the reaction processes during geopolymerization. A conceptual chemical deformation model for geopolymer is summarised. The insights into the chemical deformation provided by this study will play a fundamental role in further understanding, controlling and even utilizing the deformation behaviours of geopolymers.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/8be0ad19d42b2785790dbd30dcf19daa6c5bf0f0
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In Civil and Structural Engineering
In Materials Chemistry
Citations in the corpus
- Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin (2019, background): “In the first stage, the mixtures with a higher content of MK show higher chemical shrinkage which may be attributed to the fast dissolution of MK [47].”
- Mechanisms of autogenous shrinkage of alkali-activated slag and fly ash pastes (2020, methodology): “Chemical shrinkage and internal RH Dilatometry was used to measure the chemical shrinkage of the pastes as suggested by ASTM C 1608 [35], only the water was replaced by activator to be added onto the surface of the paste [36].”