Autogenous and drying shrinkage modeling: from paste to concrete

Title: Autogenous and drying shrinkage modeling: from paste to concrete
Author(s): J.P Thierry, G. Chanvillard
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 337 - 344
Total Pages: 8
Nb references: 24
Language: English

Abstract: Since the beginning of his work on cement paste, T.C. Powers used isothermal water sorption experiments as a basis for all his reflections. The main outcome of such a reasoning is of course his hydration model. Starting from cement chemistry and water/cement ratio, one can evaluate the different volumic fractions (gel, capillary pores, ...) of the cement paste as a function of the hydration rate.
Nowadays, the mechanics of porous media allow a new interpretation of these curves. As long as you are able to evaluate mechanical properties and convinced that capillarity is the main driven force of the cement paste hydraulic behavior, a key characteristic for structural applications such as shrinkage can be deduced from it. Being able to build it from simple parameters could be really interesting.
We illustrate in this paper how to combine an hydration model and upscaling techniques (presented in join papers) with the modified BET theory to achieve this goal. Then we will use this building process to compute both autogenous and drying shrinkage in a unified way, that even allows us to study a possible coupling between the two.

Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00