Abstract
Measurements of initial water absorption are reported for concretes exposed indoors or outside for 1.5 years. Water absorption after a given wetting time was increased with an increase of water/cement ratio, a reduction of moist curing and partial replacement of the Portland clinker component of the cement. Absorption after outdoor exposure was less than that after laboratory exposure, especially if rain could fall on the concrete surface. Absorption results correlated approximately with weight losses during initial exposure and with compressive strengths at the start of exposure. There was a near-linear relationship between carbonation depths and absorption measured in cover concrete after 1.5 years of exposure
Resume
On rend compte de mesures de l'absorption d'eau initiale sur des bétons exposés pendant 18 mois en milieu fermé et en plein air. Après un temps donné d'humidification, l'absorption d'eau augmentait avec l'accroissement du rapport eau/ciment, la diminution de la conservation à l'état humide et le remplacement partiel du composant de clinker Portland du ciment. A la suite de l'exposition à l'air libre, l'absorption, en particulier si la pluie était tombée sur la surface du béton, était moindre qu'en laboratoire. Les résultats de l'absorption correspondaient approximativement avec les pertes de poids durant l'exposition initiale, et aux résistances en compression au début de l'exposition. On a constaté une relation non linéaire entre les profondeurs de carbonatation et l'absorption mesurées dans le béton d'enrobage après une exposition de 18 mois.
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Parrott, L.J. Water absorption in cover concrete. Materials and Structures 25, 284–292 (1992). https://doi.org/10.1007/BF02472669
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DOI: https://doi.org/10.1007/BF02472669