https://doi.org/10.1140/epjst/e2014-02264-1
Review
A soft matter in construction – Statistical physics approach to formation and mechanics of C–S–H gels in cement
1 Department of Physics and Institute for Soft Matter Synthesis & Metrology, Georgetown University, Washington DC, USA
2 Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zurich, Switzerland
3 Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, USA
4 School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, UK
5 CINaM, CNRS and Aix-Marseille University, Marseille, France
6 Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, USA
7 MIT-CNRS Joint Laboratory, Massachusetts Institute of Technology, Cambridge, USA
a e-mail: ed610@georgetown.edu
Received: 4 June 2014
Revised: 18 August 2014
Published online: 24 October 2014
Calcium-silicate hydrate (C–S–H) is the main binding agent in cement and concrete. It forms at the beginning of cement hydration, it progressively densifies as cement hardens and is ultimately responsible of concrete performances. This hydration product is a cohesive nano-scale gel, whose structure and mechanics are still poorly understood, in spite of its practical importance. Here we review some of the open questions for this fascinating material and a statistical physics approach recently developed, which allows us to investigate the gel formation under the out-of-equilibrium conditions typical of cement hydration and the role of the nano-scale structure in C–S–H mechanics upon hardening. Our approach unveils how some distinctive features of the kinetics of cement hydration can be related to changes in the morphology of the gels and elucidates the role of nano-scale mechanical heterogeneities in the hardened C–S–H.
© EDP Sciences, Springer-Verlag, 2014
