High-Strength Concrete Incorporating Several Admixtures


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Title: High-Strength Concrete Incorporating Several Admixtures

Author(s): D. Tachibana, M. Imai, N. Yamazaki, T. Kawai, and Y. Inada

Publication: Special Publication

Volume: 121


Appears on pages(s): 309-330

Keywords: admixtures; blast furnace slag; compressive strength; creep properties; high-strength concretes; modulus of elasticity; plasticizers; segregation; shrinkage; silica fume; tensile strength; temperature rise (in concrete); workability; Materials Research

Date: 11/1/1990

It is more difficult to obtain good workability and to assure high concrete compressive strengths for high-strength concretes than for lower strength concretes. Several admixtures are often used in combination to increase workability of the fresh concrete. Along these lines, two kinds of chemical admixtures and three kinds of mineral admixtures were selected for use in this study. The study was carried out to examine the effects of materials, particularly admixtures, and mix proportions on several properties of freshly mixed and hardened concrete having a compressive strength of more than 100 MPa. This paper reports on the contribution of silica fume to the workability and constructibility, with a focus on improvement of its compressive strength. It is also reported that ground granulated blast furnace slag can be utilized to improve several properties, e.g., control of thermal cracks due to the heat of cement hydration. Furthermore, slump loss characteristics, the resistance to segregation, tensile strength, modulus of elasticity, shrinkage, creep, and freeze-thaw durability, and the alkali-aggregate reactivity were tested.