Properties of High-Strength Concrete Subjected to Uniaxial Loading


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Title: Properties of High-Strength Concrete Subjected to Uniaxial Loading

Author(s): N. Han and J. C. Walraven

Publication: Special Publication

Volume: 149


Appears on pages(s): 269-288

Keywords: compression; curing; deformation; high-strength concretes; loads (forces); mix proportioning; strains; strength; stresses; tension; Materials Research

Date: 10/1/1994

The time-dependent properties of high-strength concrete subjected to tensile and compressive loading have been studied experimentally and have been compared with those of normal concrete. Two kinds of load application were used during this investigation: loading with a constant strain rate and sustained loading. The range of strain rates is chosen between the so-called static and the creep strain rate limits. The ratio of adopted stress to 28-day prismatic strength in the sustained loading tests was chosen at 0.15, 0.35, 0.50, 0.75, 0.85, and 0.95. The research program mainly focused on the influence of the type of load application on the behavior of high-strength concrete in compression and tension. The phenomena observed in the experiments are interpreted by referring to a basic mechanism of rate sensitivity of concrete. The differences of the material structure between high-strength concrete and normal strength concrete are emphasized. In general, it is found that some properties of high-strength concrete in compression, such as strength and deformation characteristics, are more sensitive to the strain rate than those of normal strength concrete, whereas in tension, this tendency is less pronounced. On the basis of the test results, the long-term strength of high-strength concrete is defined.