THE CHARACTERISTICS OF AIR-BUBBLE SYSTEMS IN HARDENED CONCRETE PRODUCED BY THREE TYPES OF AIR ENTRAINING AGENT-PLASTICIZER COMBINATION

It is known that water saturated concretes are generally not stable in a freeze-thaw environment; however their performance can be improved by entraining about 5 per cent air, in the form of fine bubbles, in them. It is known that the size and the spacing-distributions of the entrained air bubble systems are related to this improvement in performance. After the partial withdrawal of the saturated flow hydraulic pressure theory the theoretical basis of the above correlations is not very clear. Though the total volume, size and the spacing distribution of the air bubbles in the hardened concrete are the relevant parameters, and these should be measured in each case; it is however a common practice to measure the volume of the entrained air in fresh concrete. The tacit assumption seems to be that if an agent produces a satisfactory and stable air bubble system in one type of concrete it will produce similar air bubble systems in other concretes irrespective of the cement and aggregate types and the only variable to be controlled is the volume of air entrained in fresh concrete.

  • Availability:
  • Corporate Authors:

    ASBL Silicates Industriels

    32 rue de Malplaquet
    B-7000 Mons,   Belgium 
  • Authors:
    • Chatterji, S
    • Gudmundsson, H
    • Damgarosson, H D
  • Publication Date: 1978

Language

  • English

Media Info

  • Features: Photos; References; Tables;
  • Pagination: p. 153-156
  • Serial:
    • Silicate Industriels
    • Volume: 43
    • Issue Number: 7/8
    • Publisher: ASBL Silicates Industriels
    • ISSN: 0037-5225

Subject/Index Terms

Filing Info

  • Accession Number: 00324598
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM