Early age autogenous deformations of cement-based materials

Marwen Bouasker (1) , Frederic Grondin (1) , Pierre Mounanga (1) , Abdelhafid Khelidj (1)

1 GeM - Institut de Recherche en Génie Civil et Mécanique

Autogenous shrinkage is considered to be one of the main phenomena involved in the early‐age cracking of cementitious systems with low water‐to‐cement ratio. It results from the volume difference between the hydration products (hydrates) and the corresponding reactants (cement and water) and the self‐desiccation of the porous network caused by the water consumption in the course of hydration. The objective of this paper is to model the autogenous shrinkage of a cement paste from the first contact between cement and water up to 2 days of hydration by means of a multi‐scale homogenization model. The inputs of the model are the chemical composition and the Blaine fineness of cement, the mechanical properties of the main cement phases and the water‐to‐cement ratio (W/C). The outputs are the evolution of the cement phase volume fractions and chemical hydration reactions, the Young's modulus, the capillary tension, the chemical and the autogenous shrinkage. Numerical and experimental results are analysed in order to validate the model and propose improvements.

Mots clés: cement paste; autogenous shrinkage; early stage; modelling; experiments

Domaines: Mécanique [physics.med-ph]; Matériaux

Marwen Bouasker, Frederic Grondin, Pierre Mounanga, Abdelhafid Khelidj. Early age autogenous deformations of cement-based materials: Multi-scales micromechanics modelling. 3rd International Conference on Coupled THMC Processes in Geo-systems, 2008, Lille, France. ⟨10.1002/9781118623565.ch30⟩. ⟨hal-01008090⟩