Strength Development Characteristics of High-Strength Concrete Incorporating Supplementary Cementing Materials


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Title: Strength Development Characteristics of High-Strength Concrete Incorporating Supplementary Cementing Materials

Author(s): P. Read, G. G. Carette, and V. M. Malhotra

Publication: Special Publication

Volume: 121


Appears on pages(s): 527-548

Keywords: blast furnace slag; compressive strength; concrete cores; curing; cylinders; fly ash; high-strength concretes; plasticizers; silica fume; strength; tests; Materials Research

Date: 11/1/1990

Presents data at ages up to 1 year on the strength development characteristics of high-strength concrete ( > 80 MPa) incorporating blast furnace slag and/or silica fume or high volumes of ASTM Class F fly ash. Six concrete mixtures of various compositions were investigated in this study. Five of these mixtures had the same cementitious materials content of 485 kg/m3 of concrete, and the sixth mixture was typical of high-volume fly ash concrete incorporating a cement content of 150 kg/m3 of concrete and large volumes of fly ash. The concrete was obtained from a commercial ready-mixed concrete plant. For each mixture, three types of structural elements simulating a thick wall, a thin wall, and a thick column were fabricated for testing under field curing conditions. Cores, 100 x 200 mm in size, were drilled at ages up to 1 year for determining the in situ compressive strength of the various concrete elements. In addition, a number of 150 x 300 mm cylinders were cast from each mixture for long-term strength testing. The test results indicate that compressive strengths approaching 100 Mpa at 1 year can be achieved using a superplasticizer, with or without the use of supplementary cementing materials. The moist-cured test cylinders and the drilled cores from the various concrete elements indicate continued gain in strength of concrete at ages at least up to 365 days. The use of silica fume is generally required if high early-age strengths are to be achieved in structural elements. However, if high early-age strength is not a critical factor, then the high-volume fly ash concrete seems to be the most promising system.