High Fly Ash Content Concrete: A Review and a Case History


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Title: High Fly Ash Content Concrete: A Review and a Case History

Author(s): M. R. H. Dunstan and R. E. Joyce

Publication: Special Publication

Volume: 100


Appears on pages(s): 1411-1444

Keywords: abrasion resistance; aprons; compressive strength; concrete dams; concrete durability; concrete pavements; economics; flexural strength; fly ash; performance; reviews; roller compacted concrete; subbases; weathering; Materials Research

Date: 4/1/1987

Concretes containing large quantities of fly ash have now been used in the U.K. and elsewhere for about 10 years. This type of concrete, which has become known as high fly-ash content concrete (HFCC), was originally developed as a roller-compacted concrete for dams. The mix proportions of HFCC are designed considering the fly ash to be an integral ingredient in the concrete, as opposed to a portland cement replacement. The uses of HFCC have now been extended to road construction and structural concrete, including high-workability and high-strength concretes. Throughout the development of HFCC, testing of the concrete in-situ has been considered to be of paramount importance, in addition to the usual laboratory trials. Paper traces the development of HFCC and considers a particular case history in which a direct comparison was made, over a period of four years, between two airfield pavements. One pavement contained conventional portland cement concrete and the other high fly-ash content concrete. The results of testing for cube and core compressive strength and flexural strength are presented together with the results of a limited number of tests of the four-year-old pavement for durability. The conclusion is that, in this particular case, both pavements exhibited comparable strength and durability characteristics generally, although the HFCC pavement seemed to have better weathering and abrasion resistance, as well as a significant economic advantage.