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An optimised preconditioning procedure for gas permeability measurement

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Abstract

To study the permeability of cementitious materials; a procedure of drying out moisture before the actual measurement of this property, normally called preconditioning, is an unavoidable necessity. In this study, the preconditioning procedure developed by the authors earlier, is used to carry out the measurement of permeability to gases of 15 concrete compositions in order to compare the different steps proposed by these procedures: these concretes have been studied in terms of durability in a “BHP2000” project. These 15 compositions include 4 ordinary concretes, 5 medium strength concretes, 4 HPCs and 2 VHPCs. We have compared the preconditioning temperatures for their possible effects on the measured value of permeability as well as its adequacy in drying out moisture during a short period of time. Also, in addition to be practicality of the procedures, the coverage of the whole range of degrees of saturation by the permeability results is given due importance. These considerations have culminated in a optimised preconditioning procedure which is not only simple and flexible but also guarantees adequate information about the permeation characteristics of the material under study, for a whole range of concrete qualities.

Résumé

Lorsque l'on souhaite mesurer la perméabilité au gaz d'un matériau cimentaire, il est nécessaire de procéder à un préconditionnement du matériau: ce préconditionnement est en général un séchage visant à enlever tout ou partie de l'eau contenue dans le réseau poreux. Dans cette étude, deux procédures de préconditionnement sont présentées et comparées; il s'agit de la procédure AFREM et d'une procédure développée par les auteurs. Ces deux méthodes ont pu être testées sur une large gamme de bétons étudiés en terme de durabilité dans le cadre d'un projet «BHP2000». Outre la comparaison pas à pas de ces deux méthodes, nous avons étudié l'influence de la température de séchage sur la mesure de perméabilité. Cette étude nous a permis de mettre au point une nouvelle procédure de préconditionnement optimisant les deux procédures initiales en terme de simplicité et d'adaptation à une large gamme de béton.

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References

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Authors and Affiliations

  1. Départment de Génie Civil, LMDC, INSA-UPS, Complexe scientifique de Rangueil, 31077, Toulouse, France

    M. Carcassès, A. Abbas, J. -P. Ollivier & J. Verdier

Authors
  1. M. Carcassès
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  2. A. Abbas
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  3. J. -P. Ollivier
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  4. J. Verdier
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Additional information

Editiorial Note Prof. Jean-Pierre Ollivier and Prof. Myrian. Carcassès are RILEM Senior Members. They both work at LMDC, a RILEM Titular Member, and participate in the work of TC 178-TMC: ‘Testing and modelling chloride penetration in concrete’. Prof. Ollivier is also a member of the Scientific committee (Board of Advisers) of Materials and Structures.

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Carcassès, M., Abbas, A., Ollivier, J.P. et al. An optimised preconditioning procedure for gas permeability measurement. Mat. Struct. 35, 22–27 (2002). https://doi.org/10.1007/BF02482086

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  • DOI: https://doi.org/10.1007/BF02482086

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