EFFECTS OF PULVERSIZED FUEL ASH ON CORROSION OF STEEL IN CONCRETE . DURABILITY OF BUILDING MATERIALS AND COMPONENTS. PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE HELD IN BRIGHTON, NOVEMBER 7-9, 1990

This paper reports the findings of a preliminary investigation into the effect of pulverized fuel ash (pfa) on the corrosion of steel in mortar specimens using comparative accelerated corrosion tests. For indication of the protection afforded by the covering material against corrosion, three parameters were chosen: the normalised weight loss of steel due to accelerated corrosion achieved by applying a constant voltage across the specimens until cracks were detected, the amount of electrical charge imposed within the test duration, or the cracking charge', and the resistivity of the mortar. Other quality indices such as the pH values, and the compressive strength of the mortar were also monitored. It was observed that replacement of cement by pulverized fuel ash of up to 30% generally reduced the electrical energy required to crack the test specimens. The estimated pH values of mortar decreased with the increase of pfa replacement at a water/cement ratio of 0.6, but was relatively unaffected by pfa at water/cement ratio of 0.4. The replacement of cement by pfa in the mortar initially reduced its resistivity (measured at 14 days), but with prolonged curing, was shown to have increased its resistivity at 91 days of age. This phenomenon was observed for both precracked and uncracked specimens alike. Consequently, the measured weight loss of steel due to accelerated corrosion was found to be increased by pfa replacement at 14 days but decreased at 91 days. The importance of curing for durability of concrete with pfa replacement was thus clearly illustrated. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0419154809
• Corporate Authors:

  E and F Spon Limited

  2-6 Boundary Road
  London,   England 
• Authors:
  • LOO, Y H
  • Ting, S K
• Publication Date: 1991

Language

• English

Media Info

• Features: References;
• Pagination: p. 145-50
• Serial:
  • Publication of: E and F Spon Limited
  • Publisher: E and F Spon Limited

Subject/Index Terms

• TRT Terms: Concrete; Conferences; Corrosion; Mortar; Pulverized fly ash; Steel
• Old TRIS Terms: Pulverized fuel ash
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00617498
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-419-15480-9
• Files: ITRD, TRIS
• Created Date: Nov 30 1992 12:00AM