Kinetic simulations of cement creep: mechanisms from shear deformations of glasses

Masoero, E., Bauchy, M., Del Gado, E., Manzano, H., Pellenq, R. M., Ulm, F-J., Yip, S., Hellmich, C, Pichler, B and Kollegger, J 2015. Kinetic simulations of cement creep: mechanisms from shear deformations of glasses. Presented at: CONCREEP 10: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, Vienna, Austria, 21-23 September 2015. Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. ASCE, pp. 555-564. 10.1061/9780784479346.068

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Abstract

The logarithmic deviatoric creep of cement paste is a technical and scientific challenge. Transition State Theory (TST) indicates that some nanoscale mechanisms of shear deformation, associated with a specific kind of strain hardening, can explain the type of deviatoric creep observed experimentally in mature cement pastes. To test this possible explanation, we simulate the shear deformations of a colloidal model of cement hydrates at the nanoscale. Results from quasi-static simulations indicate a strain hardening analogous to that postulated by the TST approach. Additional results from oscillatory shear (fatigue) simulations show an increase of deformation with number of loading cycles that is consistent with the observed creep. These findings indicate that nanoscale simulations can improve our current understanding of the mechanisms underlying creep, with potential to go beyond the logarithmic creep and explore the onset of failure during tertiary creep.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Engineering
Publisher:	ASCE
ISBN:	9780784479346
Last Modified:	06 Jan 2024 02:08
URI:	https://orca.cardiff.ac.uk/id/eprint/144209

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