Permeability and corrosion resisting characteristics of fly ash concrete in Arabian Gulf countries

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

This paper reports results of an investigation carried out to evaluate permeability, porosity and the corrosion resisting characteristics of fly ash concrete made with finely graded beach/dune sand and crushed limestone (typical aggregates used in the Arabian Gulf countries). The experimental program was designed to include concretes made with water-cement ratios in the range of 0.35 to 0.55. The effect of fly ash addition on the water permeability, porosity, and pulse velocity was studied over a period of one year. Accelerated corrosion tests were carried out in the laboratory for a period of about 4 years to study the corrosion resisting characteristics of these concrete mixes. Specimens were located in the exposure site to evaluate the effect of salt contamination on the corrosion of rebars in fly ash concrete. Time to cracking, weight loss of rebars and pH measurements were also carried out on these specimens. Results show that fly ash incorporation in concrete improves its general quality. Fly ash concretes show significantly better performance than plain cement concrete mixes in terms of resistance against rebar corrosion. Also, fly ash concrete specimens contaminated with salts do not show a noticeable aggravation in the rebar corrosion process for 20 percent replacement and for a 9-month exposure period. Reaction between fly ash and calcium hydroxide does not reduce the pH value below the pH of pure saturated Ca(OH) 2 solution (12.5) even after partial consumption of the calcium hydroxide by fly ash.

Original languageEnglish
Title of host publicationFly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete
Subtitle of host publicationProceedings - 3rd International Conference
EditorsV.M. Malhotra
PublisherAmerican Concrete Institute
Pages295-313
Number of pages19
ISBN (Electronic)9780870316128
StatePublished - 1 May 1989

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-114
ISSN (Print)0193-2527

Bibliographical note

Publisher Copyright:
© 1989 American Concrete Institute. All rights reserved.

Keywords

  • Aggregates
  • Alkalinity
  • Concretes
  • Corrosion resistance
  • Fly ash
  • Penneability
  • Porosity

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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