Properties of High-Strength, Lightweight Concrete Incorporating Fly Ash and Silica Fume


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Title: Properties of High-Strength, Lightweight Concrete Incorporating Fly Ash and Silica Fume

Author(s): V. M. Malhotra

Publication: Special Publication

Volume: 121


Appears on pages(s): 645-666

Keywords: compressive strength; creep properties; drying shrinkage; flexural strength; fly ash; high-strength concretes; lightweight aggregate concretes; modulus of elasticity; plasticizers; splitting tensile strength; Materials Research

Date: 11/1/1990

Reports results of a study undertaken to develop high-strength lightweight concrete having compressive strength of about 700 MPa and a density of less than 2000 kg/m3. The materials used consisted of an expanded shale lightweight aggregate of Canadian origin, ASTM Type III cement, low-calcium fly ash, and condensed silica fume. A series of 7 concrete mixtures involving 14 concrete batches were made. The cement or cementitious material content of the mixtures ranged from 300 to 600 kg/m3. All mixtures were air entrained and superplasticized. A large number of test cylinders and prisms were cast for the determination of mechanical properties and drying shrinkage of concrete. From the results of this investigation, it is concluded that concrete with a compressive strength of about 70 MPa at 365 days and density of less than 2000 kg/m3 can be made incorporating supplementary cementing materials. The highest compressive strength achieved was 69.3 MPa at 365 days for a mixture with a cementitious material content of 600 kg/m3 of concrete; the highest flexural strength obtained was 8.7 MPa at 28 days.