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Development of a new experimental technique for the study of the autogenous shrinkage of cement paste

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Abstract

After defining and describing the main physicochemical mechanisms governing the autogenous shrinkage of concrete, a number of different experimental approaches used to asses this phenomenon are discussed. The base principle and a detail description of a new experimental technique aiming to completely characterise the autogenous shrinkage of a cement paste are presented. The originality of the technique comes from the fact that the variation of the external volume (external autogenous shrinkage) and the volume of the gasfilled spaces in the liquid phase after the hardening (internal autogenous shrinkage) are measured separately and simultaneously. The total autogenous shrinkage is the sum of the internal and external autogenous shrinkages. A number of experimental results are presented to demonstrate the validity of the proposed experimental approach and to analyse the effect of water/cement ratio on the development of internal and external shrinkages.

Résumé

Après avoir défini et décrit les principaux mécanismes physico-chimiques à l'origine du retrait endogène du béton, on discute des différentes approches expérimentales ayant déjà été utilisées pour étudier ce phénomène. On présente ensuite le principe de base et une description détaillée d'une nouvelle technique expérimentale permettant la caractérisation complète du retrait endogène des pâtes de ciment. L'originalité de la technique repose sur le fait qu'on mesure séparément et simultanément la variation du volume externe (retrait endogène externe) et le volume des vides gazeux crées dans la phase liquide après le durcissement (retrait endogène interne). Le retrait endogène total correspond à la somme des retraits endogène externe et interne. Quelques résultats expérimentaux sont présentés pour démontrer la validité de l'approche expérimentale proposée et pour illustrer l'influence du rapport eau/ciment sur le développment des retraits endogènes externes et internes.

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Authors and Affiliations

  1. CRIB, Department of Civil Engineering, University of Sherbrooke, Quebec, Canada

    R. Gagné, I. Aouad, J. Shen & C. Poulin

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  1. R. Gagné
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  2. I. Aouad
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  3. J. Shen
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  4. C. Poulin
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Editorial Note Prof. R. Gagné works at the CRIB, a RILEM Titular member.

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Gagné, R., Aouad, I., Shen, J. et al. Development of a new experimental technique for the study of the autogenous shrinkage of cement paste. Mat. Struct. 32, 635–642 (1999). https://doi.org/10.1007/BF02481701

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