Fly Ash in High-Strength Concrete


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Title: Fly Ash in High-Strength Concrete

Author(s): M. K. Gopalan and M. N. Haque

Publication: Special Publication

Volume: 121


Appears on pages(s): 331-350

Keywords: cement content; curing; fly ash; high-strength concretes; mix proportioning; optimization; permeability; plasticizers; specimens; tests; water-cementitious ratio; Materials Research

Date: 11/1/1990

Compressive strength and water penetration of three grades of high-strength concretes with cement contents ranging from 400 to 500 kg/m3 and a proprietary superplasticizer are reported. The control mixes were redesigned by adding a Class F-type fly ash at fly ash/cementitious ratios of 0.15 and 0.35. All concretes were designed for a similar workability. The strength development was monitored in three curing regimes. It is concluded that the superplasticized concrete developed a higher strength than that predicted from a reduction in the water/cement ratio. The curing conditions significantly influenced the strength development and the water penetration of the concretes. An optimum fly ash/cementitious ratio of 0.15 was found to be appropriate for the concretes; larger amounts of fly ash were found undesirable for higher strength development.