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Surface tension skrinkage and strength of hardened cement paste

  • Colloque RILEM Munich. 1–3 Avril 1968
  • Causes Physiques et Chimiques du Fluage et du Retrait du Béton
  • Published:
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Résumé

La tension superficielle et l'énergie superficielle d'un solide se trouvent diminuées par la présence d'une pellicule d'eau adsorbée. Quand la tension superficielle d'un matériau poreux à grande surface interne est diminuée, la longueur augmente tandis que la résistance diminue. En s'appuyant sur la théorie de la propagation des fissures de Griffith, il est possible de calculer l'énergie superficielle. Pour une pâte de ciment durcie ayant un rapport eau/ciment de 0,45 et de 0,6, l'énergie superficielle se révèle être de 1370 erg/cm2 et de 657 erg/cm2 respectivement. On a laissé la pâte de ciment s'hydrater durant 28 jours sans perdre d'humidité à une température de 20 °C. Ces résultats concordent avec l'énergie superficielle du verre poreux possédant une surface similaire.

Summary

The surface tension and the surface energy of a solid is reduced by the presence of an adsorbed water film. When the surface tension of a porous material with a large interior surface is reduced, the length increases whereas the strength decreases. With the help of Griffith's theory of crack propagation it is possible to calculate the surface energy. For hardened cement paste with a water cement ratio of 0.45 and 0.6 the surface energy is found to be 1370 erg/cm2 and 657 erg/cm2 respectively. The cement paste was allowed to hydrate for 28 days without loss of moisture at a temperature of 20 °C. These results are in agreement with the surface energy of porous glass with a similar interior surface.

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  1. Physics Laboratory of the Materialprüfungsamt für das Bauwesen, Technical University, Munich, R.F.A.

    F. Wittmann

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  1. F. Wittmann
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Wittmann, F. Surface tension skrinkage and strength of hardened cement paste. Matériaux et Constructions 1, 547–552 (1968). https://doi.org/10.1007/BF02473643

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