THE WATER CONTENT OF CONCRETE AT HIGH TEMPERATURES

UEBER DEN WASSERGEHALT VON BETON BEI HOEHEREN TEMPERATUREN

THE WATER CONTENT OF DRIED CONCRETE IS COMPOSED OF THE WATER CONTAINED IN THE CEMENT STONE AND THE AGGREGATES. THE HIGHEST VALUE OF RETAINED WATER IN CEMENT STONE CAN BE TAKEN AS 24% BY WEIGHT (DEPENDING ON THE CEMENT). UNDER CONSTRUCTION CONDITIONS, THIS LIMITING VALUE IS GENERALLY NOT REACHED. THE WATER CONTENT AT HIGH TEMPERATURES CAN BE ESTIMATED INDEPENDENTLY OF THE COMPOSITION OF THE STANDARD CEMENTS. THE LATENT WATER CONTENT IS LOW IN THE CASE OF NORMAL AGGREGATE, WITH SAND AND GRAVEL IT IS GENERALLY BETWEEN 4.5 AND 2.0% BY WEIGHT; SPECIAL AGGREGATES DO HAVE A CONSIDERABLY HIGHER WATER CONTENT, SUCH AS FOR EXAMPLE, LIMONITE AND SERPENTINE. THE WATER CONTENT OF CONCRETE (CEMENT STONE, AGGREGATE) AT HIGHER TEMPERATURES CAN BE DERIVED FROM THERMOGRAVIMETRIC TESTS OR FROM CHEMICAL METHODS USING THERMALLY PRE-TREATED SAMPLES. FOR PRACTICAL PURPOSES IT IS OFTEN ADEQUATE TO USE AN APPROXIMATION WHICH IS ON THE SAFE SIDE FROM THE GENERAL BEHAVIOUR OF THE CEMENT STONE AND ON OCCASION THE AGGREGATE.

  • Authors:
    • MANNS, W
  • Publication Date: 1975

Language

  • German

Media Info

  • Pagination: 26-30
  • Serial:
    • Beton
    • Volume: 25
    • Issue Number: 1
    • Publisher: BetonVerlag GmbH

Subject/Index Terms

Filing Info

  • Accession Number: 01293085
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 3:51AM