The physics of cement cohesion

Abhay Goyal (1) , Ivan Palaia (2, 3) , Katerina Ioannidou (4, 5) , Franz-Josef Ulm (4) , Henri van Damme (6) , Roland J.-M. Pellenq (1, 4) , Emmanuel Trizac (7) , Emanuela del Gado (1)

1 GU - Georgetown University [Washington]
2 Université Paris-Saclay
3 UCL - University College of London [London]
4 MIT - Massachusetts Institute of Technology
5 PMMD - Physique et Mécanique des Milieux Divisés
6 ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris
7 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques

Cement is the most produced material in the world. A major player in greenhouse gas emissions, it is the main binding agent in concrete, providing a cohesive strength that rapidly increases during setting. Understanding how such cohesion emerges is a major obstacle to advances in cement science and technology. Here, we combine computational statistical mechanics and theory to demonstrate how cement cohesion arises from the organization of interlocked ions and water, progressively confined in nanoslits between charged surfaces of calcium-silicate-hydrates. Because of the water/ions interlocking, dielectric screening is drastically reduced and ionic correlations are proven notably stronger than previously thought, dictating the evolution of nanoscale interactions during cement hydration. By developing a quantitative analytical prediction of cement cohesion based on Coulombic forces, we reconcile a fundamental understanding of cement hydration with the fully atomistic description of the solid cement paste and open new paths for scientific design of construction materials.

Domaines: Chimie-Physique [physics.chem-ph]

Abhay Goyal, Ivan Palaia, Katerina Ioannidou, Franz-Josef Ulm, Henri van Damme, et al.. The physics of cement cohesion. Science Advances , 2021, 7 (32), pp.eabg5882. ⟨10.1126/sciadv.abg5882⟩. ⟨hal-03330052⟩