Materials and Structures

, 31:568 | Cite as

A water sorptivity test for martar and concrete

  • B. B. Sabir
  • S. Wild
  • M. O'Farrell
Technical Reports

Abstract

This paper describes a test rig to measure the uni-directional water absorption of mortar and concrete. The test data acquisition is controlled by purpose written software installed on a PC and the results are utilised directly to obtain the sorptivity measured in g/mm2/min1/2. As an example the apparatus was used to obtain the sorptivity of mortar in which the ordinary Portland cement was partially replaced by ground waste brick obtained from different sources. The results presented demonstrate the validity of the test, and the apparatus and the methodology are shown to be of sufficient sensitivity in detecting the differences between the sorptivities of the various mortars tested. The variation in the sorptivity with curing time and mixture composition was determined. The paper also gives the results of total water absorption test conducted on the sorptivity test specimens, after being reconditioned, and the results of compressive strength tests for all the mortars investigated.

Keywords

Compressive Strength Water Absorption Ordinary Portland Cement Water Sorptivity Brick Clay 

Résumé

Cet article décrit un appareil d'essai pour mesurer l'absorption unidirectionnelle de l'eau par le mortier et le béton. Les données résultant des essais sont contrôlées au moyen d'un logiciel spécialement conçu installé sur PC, et ces résultats sont directement utilisés pour obtenir la sorptivité mesurée en g/mm2/min1/2. A titre d'exemple, on a utilisé l'appareil pour déterminer la sorptivité d'un mortier dans lequel le ciment Portland ordinaire avait été partialement remplacé par les briques de récupération partialement concassées. Les résultats présentés ici démontrent la validité de l'essai, et le fait que l'appareil et la méthodologie ont une sensibilité suffisante pour détecter les différences entre les sorptivités des différents mortiers étudiés. Les variations de la sorptivité en fonction du temps de cure et de la composition du mélange ont été déterminées. L'article présente également les résultats d'essais d'absorption totale de l'eau menés sur les éprouvettes utilisées pour les essais de sorptivité, après leur reconditionnement, ainsi que les résultats d'essais de résistance à la compression pour tous les mortiers étudiés.

References

  1. [1]
    Larby, L. A., ‘Microstructure of the interfacial zone around aggregate particles in concrete’,Heron 38 (1) (1993) 69–81.Google Scholar
  2. [2]
    Ho, D. W. S. and Lewis, R. K., ‘Concrete quality as measured by water sorptivity’,Civ. Eng. Trans., Inst. Engs. Aus. CE26 (1984) 306–313.Google Scholar
  3. [3]
    Ho, D. W. S., ‘Influence of slag cement on the water sorptivity of concrete’, in ‘Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete’, Proceedings of an International Conference (American Concrete Institute, SP-91, Detroit, 1986) 1463–1473.Google Scholar
  4. [4]
    Ho, D. W. S. and Lewis, R. K., ‘The water sorptivity of concrete: the influence of constituents under continuous curing’,Durability of Building Materials (4) (1987) 241–252.Google Scholar
  5. [5]
    Hall, C. and Kam Min Tse, T., ‘Water movement in porous building materials—VII: The sorptivity of mortars’,Building Environment (21) (1986) 113–118.CrossRefGoogle Scholar
  6. [6]
    Hall, C. and Yau, M. H. R., ‘Water movement in porous building materials—IX: The water absorption and sorptivity of concretes’,Ibid. (22) (1987) 77–82.CrossRefGoogle Scholar
  7. [7]
    Hall, C., ‘Water sorptivity of mortars and concrete: a review’,Magazine of Concrete Research 41 (147) (1989) 51–61.CrossRefGoogle Scholar
  8. [8]
    Kelham, S., ‘A water absorption test for concrete’,Ibid. 40 (143) (1988) 106–110.Google Scholar
  9. [9]
    Wild, S., Khatib, J. and Sabir, B. B., ‘The potential of fired brick clay as a partial cement replacement material’, in Proc. Int. Congress Concrete in the Service of Mankind, Concrete for Environment Enhancement and Protection, Theme 6-Waste Materials and Alternative Products, Ed. R. K. Dhir and I. D. Dyer (E and FN Spon, Dundee, 1996) 685–696.Google Scholar
  10. [10]
    Wild, S., Gailus, A., Hansen, H., Pederson, L. and Szwabowski, J., ‘Pozzolanic properties of a variety of European clay bricks’,Building Research Information 25 (3) (1997) 170–175.CrossRefGoogle Scholar
  11. [11]
    Neville, A. M., ‘Properties of Concrete’, 4th edn (Longman, England, 1995).Google Scholar
  12. [12]
    Wild, S., Khatib, J. and O'Farrell, M., ‘Sulphate resistance of mortar containing ground brick clay calcined at different temperatures’,Cement and Concrete Research 27 (5) (1997) 697–709.CrossRefGoogle Scholar
  13. [13]
    Parrott, L. J., ‘Water absorption in cover concrete’,Mater. Struct. 25 (149) (1992) 284–292.CrossRefGoogle Scholar
  14. [14]
    Martys, C. F. and Ferraris, C. F., ‘Capillary transport in mortars and concrete’,Cement and Concrete Research 27 (5) (1997) 747–760.CrossRefGoogle Scholar

Copyright information

© RILEM 1998

Authors and Affiliations

  • B. B. Sabir
    • 1
  • S. Wild
    • 1
  • M. O'Farrell
    • 1
  1. 1.School of the Built EnvironmentUniversity of GlamorganPontypriddUK

Personalised recommendations