Thermal Cracking of Massive Concrete Structures by Eduardo M.R. Fairbairn & Miguel Azenha

Author:Eduardo M.R. Fairbairn & Miguel Azenha
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(7.2)

where E a is the activation energy [Jmol−1], R is the ideal gas constant 8.3145 [JK−1mol−1], T is the temperature [K], α is the hydration degree, and is the chemical affinity [s−1].

Many kinds of expression describing the evolution of the chemical affinity have been used (see among others Lackner and Mang 2004; Cervera et al. 1999a; Benboudjema and Torrenti 2008; Briffaut et al. 2012; Sciumè et al. 2013), but there remains experimental fitting. Buffo-Laccarière et al. (2007) proposed an expression for multiphasic hydration degree evolution linked to chemical activation and physical water accessibility to anhydrous cement product which allows for composed cement.

The energy of activation is also a function of the temperature and may vary as a function of the mechanisms deemed to drive hydration (Lothenbach et al. 2008). Again, the variation of the energy of activation with respect to age and temperature is often neglected in TC analyses.

Chemo-mechanical Coupling/Evolution of Mechanical Properties (Elastic, Plastic or Damage)

This kind of model is generally based on uncoupled strains decomposition:

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