UNPROTECTED AND PROTECTED CONCRETE ON-SITE CHLORIDE PENETRATION WITH TIME IN AN AGGRESSIVE ENVIRONMENT

This paper presents extensive long-term data on chloride penetration into unprotected and protected members of a reinforced concrete structure exposed to an aggressive salt-laden environment, very favourable to the transport of chloride ions into concrete. The beams, columns and slabs of the structure were made with concrete with a water-cement ratio of 0.63; some of the members were also made with concrete containing 0.5% sodium chloride by weight of concrete added during the mixing stage. The results of up to nine years of exposure show that chlorides penetrate very rapidly into the concrete from an early stage, and this penetration increases with time. There was a visible peaking of chloride concentration in the vicinity of the location of the reinforcing bars. Structural members protected with the acrylic rubber coating showed an almost total absence of penetration of chlorides throughout the exposure period. The coating thus acted not only as a complete barrier to the transport of water and chloride ions but also permitted a more uniform distribution of chlorides within the body of the concrete. (A) For the covering abstract see IRRD 867793.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 1069-80

Subject/Index Terms

Filing Info

  • Accession Number: 00675078
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 1-85075-723-2
  • Files: ITRD
  • Created Date: Mar 28 1995 12:00AM