.. _R7.01.12:

**r7.01.12** Modeling thermohydration, drying and shrinkage of concrete
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**Summary**

Two types of phenomena occurring at distinct periods in the life of concrete are described here:


* on the one hand, a thermo-hydration reaction causing a so-called endogenous shrinkage, which occurs at a young age of concrete (the first 100 days),


* on the other hand an evaporation of some of the water not used in the hydration process, a phenomenon called drying and resulting in a shrinkage of desiccation. Depending on the dimensions of the concrete structure used, this phenomenon can last from a few months to several years.

These phenomena are modelled in *Code_Aster* in the form of diffusion equations whose solution is represented by new variables making it possible to directly calculate the deformations of endogenous shrinkage (due to hydration) and of desiccation shrinkage (due to drying).

 **Table of Contents**




.. toctree::
    :hidden:

    self

.. toctree::
    :maxdepth: 2
    :numbered:

    Introduction
    Formalisation_de_la_thermo-hydratation
    Discr_tisation_du_probl_me_de_thermo-hydratation
    Formalisation_du_s_chage
    Int_gration_du_s_chage_dans_Code_Aster
    Formalisation_du_retrait_endog_ne_et_de_dessiccation
    Bibliographie
    Description_des_versions_du_document_