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Coupling Between Diffusivity and Cracks in Cement-Based Systems

Published online by Cambridge University Press:  10 February 2011

C. Tognazzi ,
J-M. Torrenti ,
M. Carcasses  and
J-P. Ollivier
C. Tognazzi
Affiliation:
DESD/SESD, CEA Saclay, 91 191 Gif sur Yvette, France LMDC, INSA-UPS, Complexe Scientifique de Rangueil, 31 007 Toulouse Cedex 4, France
J-M. Torrenti
Affiliation:
ENPC, 6-8 av. Blaise Pascal, 77455 Marne la vallée cedex 2, France
M. Carcasses
Affiliation:
LMDC, INSA-UPS, Complexe Scientifique de Rangueil, 31 007 Toulouse Cedex 4, France
J-P. Ollivier
Affiliation:
LMDC, INSA-UPS, Complexe Scientifique de Rangueil, 31 007 Toulouse Cedex 4, France
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Abstract

In this paper, experimental results and modelling of the coupling between diffusivity and cracks in cement-based systems are presented.

The cracks were generated in samples by means of a compression test. In this test, displacement is controlled, thus controlling the opening of the cracks. Diffusion tests on samples obtained at three different compression levels corresponding to three cracked states were then performed using tritiated water. These tests showed diffusivity was affected by the existence of cracks and the main effect was observed when cracks crossed the whole specimen (e.g. in the post-peak regime of the compression test).

Finally the diffusion test was modelled in a simple way, assuming that the cracks were circumscribed by parallel planes. With this model, an equivalent opening of the cracks, which was of the same order as the opening estimated using strain measurements or image analysis, was obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 325
Copyright
Copyright © Materials Research Society 2000

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References

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