Final report on corrosion of reinforcing steel in concrete containing fly ash (79-11)
Abstract
In July 1979, the Oklahoma Department of Transportation funded a research
program at Oklahoma State University concerned with the performance of concrete
containing fly ash (State Study No. 79-11-3), Initially, attention was
directed towards the influence of fly ash on the corrosion of reinforcing
steel. A study of available literature did not indicate that past use of fly
ash had been detrimental from a corrosion standpoint. During a meeting with
the Research Advisory Committee in early 1980, it was concluded that an experimental
study of the influence of fly ash on corrosion was not warranted at this
time and attention should be given to other factors related to the use of fly
ash in concrete. A brief summary of the literature study was submitted to the
sponsor in Apri 1 1980.
In May 1980, a work program covering the remaining months of the project
was approved. This effort, which was to develop general data concerned with
the strength of mixes containing various percentages of fly ash, is the subject
of this report.
During this phase of the project, type I portland cement was replaced by
fly ash on a weight basis. The percent replacement varied from O to 50 in. increments
of 10 percent. Both coarse and fine aggregates used conformed to
ASTM Standard C33 (see Appendix A), while the air entraining conformed to the
Highway Specification, Section 701 (1).