Properties of High-Strength Concrete Using "Classified Fly Ash"

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Title: Properties of High-Strength Concrete Using "Classified Fly Ash"

Author(s): K. Ukita

Publication: Special Publication

Volume: 132

Issue:

Appears on pages(s): 37-52

Keywords: blast furnace slag; compressive strength; high-strength concretes; fly ash; modulus of elasticity; porosity; splitting tensile strength; superplasticizer; workability; Materials Research

Date: 5/1/1992

Abstract:
Paper is concerned with the research of the effective utilization of fly ash produced from power plants. Three classes of "classified fly ash" produced by classifying conventional fly ash by air separation with the maximum particle diameters of about 20, 10, and 5 æm have been investigated. Special attention has been given to concrete strength enhancement effect due to classified fly ash. Experimental studies have reported on the basic properties of fresh concrete and hardened concrete having low water-binder ratio and high strength, produced by mixing the classified fly ash having the maximum particle diameter of about 10 æm, alone or in combination with ground granulated blast furnace slag. It is shown that the classified fly ash is an effective material that contributes to the reduction of superplasticizer requirements that are generally used in high-strength concrete, improvement of workability by reduced viscosity, and improvement of strength development, whether the classified fly ash is used alone or in combination with ground granulated blast furnace slag.