High-Strength Concrete -Material Properties and Structural Behavior


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Title: High-Strength Concrete -Material Properties and Structural Behavior

Author(s): R. N. Swamy

Publication: Special Publication

Volume: 87


Appears on pages(s): 119-146

Keywords: compressive strength; creep properties; cracking (fracturing); deflection; elastic properties; high-strength concretes; lightweight aggregates; prestressed concrete; shrinkage; structural design.

Date: 9/1/1985

The paper presents a comprehensive review of the material properties and structural behavior of high strength concrete. It is shown that in practice both early development of high strength and high final strength are desirable. Further, if such concretes are to be used economically, a high proportion of their strength needs to be utilised in design. Data are presented to show that by careful selection of the type of cement and design of mix proportions, strengths of 60 to 80 N/mm2 could be obtained with normal weight aggregates in 24 hrs. With light-weight aggregates, strengths of LO-25 N/mm2 in 12 hrs. and of 25-45 N/mm2 in 24 hrs. are reported. The paper then discusses the engineering properties of such concretes such as elasticity, shrinkage and creep. The implications on structural behavior, when high working stresses of 30 to 50% of the cube strength are used, are then discussed in terms of transmission length, prestress losses, short term structural behavior and longterm structural behavior. Particular emphasis is given to those aspects that need to be considered in design.