LI, Jiaqi; ZHANG, Wenxin; SANZ CAMACHO, Paula; DUTTINE, Mathieu; GARDNER, David; CARRARO, Carlo; MABOUDIAN, Roya; HUTHWELKER, Thomas

doi:10.1016/j.cemconres.2022.106900

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LI, Jiaqi
Atmospheric, Earth and Energy Division [AEED]

ZHANG, Wenxin
Caltech Division of Engineering and Applied Science

SANZ CAMACHO, Paula
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Cement and Concrete Research. 2022, vol. 159, p. 106900 (8 p.)

Elsevier

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Calcium aluminosilicate hydrate (C-A-S-H) is the binding phase of both blended cement-based and alkali-activated materials. The intrinsic mechanical properties of non-cross-linked C-A-S-H are important while experimentally unvalidated. Here, the properties are for the first time measured using high-pressure X-ray diffraction. The incompressibility and bulk modulus K0 of C-A-S-Hs are correlated to their nanostructure and stability using nuclear magnetic resonance and X-ray absorption spectroscopies. Al coordination in stable C-A-S-H (Al/Si = 0.1) cured for 546 days is purely tetrahedral (AlIV), while in metastable C-A-S-H (Al/Si = 0.05) cured for only 182 days is both AlIV and pentahedral (AlV). The stable C-A-S-H is stiffer along the a,b,c-axis with higher K0 relative to C-S-H. Short-curing-induced metastable C-A-S-H (Al/Si = 0.05) shows expanded interlayer and softer c-axis, thus lower K0 than C-S-H and the stable C-A-S-H. Our results highlight the stiffening effect of AlIV incorporation and the negative influences of insufficient curing on the nanomechanical properties of non-cross-linked C-A-S-H at Ca/Si = 1.< Réduire

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The nanomechanical properties of non-crosslinked calcium aluminosilicate hydrate: The influences of tetrahedral Al and curing age

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