COATINGS FOR CONCRETE BRIDGES

This article outlines the results of the first phase of the study commissioned from Arup Research and Development (ARD) by the Transport and Road Research Laboratory (TRRL) to investigate the use of coatings to protect concrete against chloride penetration. The aim of the study is to quantify the protection provided so that the benefits of coatings could be more objectively assessed. The study was restricted to vertical surfaces exposed principally to traffic splash and spray on the basis that this might be an appropriate use for coatings. The 3 phases of the study are selection tests on an artificial substrate, laboratory tests on concrete substrates and finally a site trial. Twenty one materials were tested on sintered glass filter discs in the first phase of the work; testing focussed on three performance requirements: transparency to water vapour, resistance to water and to chloride penetration. The test method is described. All the materials tested reduced the ingress of chlorides into coated sintered glass filter discs by at least 90%. This suggests that many materials can provide useful chloride protection, and that if these tests reflect behaviour on site then materials can be selected on the basis of other performance requirements such as resistance to weathering, adherence to or penetration into the substrate and operational flexibility at the time of application. These results also emphasize the need for tests on concrete, with and without artificial weathering, and for controlled site trials to demonstrate which test method best reproduces site conditions.

  • Availability:
  • Corporate Authors:

    FMJ International Publications Limited

    Queensway House, 2 Queensway
    Redhill, Surrey,   England 
  • Authors:
    • Thompson, D M
  • Publication Date: 1987-11-25

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00604587
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1991 12:00AM