Properties of High-Strength Concrete Using a High Fly Ash Content


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Title: Properties of High-Strength Concrete Using a High Fly Ash Content

Author(s): K.-Ch. Thienel, A. Kustermann, J. Junggunst, and R.K. Zimebelmann

Publication: Special Publication

Volume: 228


Appears on pages(s): 237-254

Keywords: compressive strength; durability; fly ash; freeze-thaw resistance; high-strength concrete (HSC); shrinkage; tensile strength; water/binder-ratio; Young’s modulus

Date: 6/1/2005

Two series of high strength concrete representing a total of fifteen mixes were investigated with respect to strength, modulus of elasticity, shrinkage and freeze-thaw resistance. A 30 % replacement of cement by fly ash was accomplished in both series. Main variables in the mix design were the binder composition and the water/binder-ratio which covered a range of 0.28 to 0.40. Workability was better than the workability of similar concretes containing silica fume. The compressive strength achieved at 90 days was classified as grade C45/55 to C80/95 depending on the mix design. The values of Young’s modulus exceeded the values predicted by current standards. The excellent durability was verified in freeze-thaw tests. The investigation proved that replacing up to 30 percent of the cement by fly ash is possible without jeopardizing strength or durability.