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• W3136393519 endingPage "106428" @default.
• W3136393519 startingPage "106428" @default.
• W3136393519 abstract "The early age volume changes occurring during the geopolymerisation reaction are not sufficiently understood yet, due to shortage of experimental data and theoretical models. This work presents new results on chemical and autogenous deformation of sodium-activated geopolymers from metakaolin, focussing on the first 72 h of reaction. The results show that the geopolymers undergo early-age chemical expansion, not shrinkage. A model is proposed to explain the experimental result, leveraging recent advances from molecular simulations. The model predicts how the extent of chemical expansion is controlled by confined water in the molecular structure of the geopolymer. However, despite this underlying chemical expansion, geopolymer samples undergo autogenous shrinkage at the macroscale, which excludes self-desiccation as the origin of autogenous deformation. A better insight is gained by monitoring the kinetics of geopolymerisation using isothermal and differential calorimetry. Two kinetic regimes are identified, with apparent activation energies of approximately 90 kJ/mol and 70 kJ/mol. This suggests that two microscopic mechanisms concur to determine the early-age volume changes of geopolymer pastes." @default.
• W3136393519 created "2021-03-29" @default.
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• W3136393519 date "2021-06-01" @default.
• W3136393519 modified "2023-10-04" @default.
• W3136393519 title "Early age volume changes in metakaolin geopolymers: Insights from molecular simulations and experiments" @default.
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• W3136393519 doi "https://doi.org/10.1016/j.cemconres.2021.106428" @default.
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