THE USE OF SUPERPLASTICIZERS AS STEEL CORROSION REDUCERS IN REINFORCED CONCRETE . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990

The aim of this work is to evaluate the influence of carbonation upon reinforcement corrosion, and to determine whether the use of superplasticizers as water reducing agents can reduce the corrosion of steel reinforcement. The carbonation process was accelerated by artificially enriching the test environment with carbon dioxide. Tests were done on concrete specimens with and without rebar reinforcements. Concretes with water cement ratios of 0.35, 0.50, 0.65 and 0.80 were used. The binder was portland cement type I used either separately or in combination with fly ash. After curing for 7 days in a saturated vapour atmosphere, the concrete specimens were exposed to the 30% carbon dioxide enriched atmosphere. The penetration depth of carbon dioxide was measured after different times of exposure by the phenolphthalein test. The corrosion electrochemical potential of the reinforcement was measured by a differential electrometer with high input impedance. The results indicate that carbonation has to be present in order for corrosion of the steel reinforcement to occur, but that it is not sufficient alone to cause it. The porosity of the concrete and the relative humidity of the environment are the determining factors. Superplasticizers can reduce steel corrosion because they enable the water cement ratio to be reduced for the same concrete workability, thus reducing the water content and permeability of the concrete. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0412374102
• Corporate Authors:

  Chapman and Hall Limited

  11 New Fetter Lane
  London,   England 
• Authors:
  • Collepardi, M
  • FRATESI, R
  • Moriconi, G
  • Biagini, S
• Publication Date: 1990

Language

• English

Media Info

• Features: References;
• Pagination: p. 269-278
• Serial:
  • Publication of: Chapman and Hall
  • Publisher: Chapman and Hall Limited

Subject/Index Terms

• TRT Terms: Admixtures; Carbonation; Concrete; Conferences; Material reinforcement; Physical properties; Reinforced concrete; Superplasticizers; Water reducing agents
• Uncontrolled Terms: Concrete properties
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00612207
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-412-37410-2
• Files: ITRD, TRIS
• Created Date: Aug 31 1991 12:00AM