Flexural Fatigue Strength of Structural Lightweight Concrete Under Water


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Title: Flexural Fatigue Strength of Structural Lightweight Concrete Under Water

Author(s): V. Ramakrishnan, G. C. Hoff, and Y. U. Shankar

Publication: Special Publication

Volume: 144


Appears on pages(s): 251-268

Keywords: compressive strength; fatigue (materials); flexural strength; high-strength concretes; lightweight aggregates; lightweight concretes; shales; stresses; underwater testing; Materials Research

Date: 3/1/1994

Presents the results of an experimental investigation conducted to determine the flexural fatigue strength of high-strength lightweight concrete under water. This concrete was produced using expanded shale aggregate and high-performance concrete admixtures such as silica fume and superplasticizer. Properties of fresh concrete and elastic and mechanical properties of hardened concretes are presented. The fresh concrete was tested for slump, air content, unit weight, and temperature. The hardened concrete was tested for moist-cured dry weight, compressive strength, modulus of elasticity, and flexural fatigue strength. The investigation indicates that a highly workable high-strength lightweight concrete can be produced successfully. The high-strength lightweight concrete had a higher endurance limit (10 to 16 percent) than normal weight concrete of equal compressive strength. In general, there was no reduction in the flexural fatigue strength for the lightweight concretes when tested under water. The static flexural strength determined from specimens that had successfully resisted 2 million cycles was always greater than that of specimens which had not undergone fatigue loading.