High-, Medium-, and Low-Strength Concretes Subject to Sustained Overloads-Strains, Strengths, and Failure Mechanisms

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: High-, Medium-, and Low-Strength Concretes Subject to Sustained Overloads-Strains, Strengths, and Failure Mechanisms

Author(s): Mohammad M. Smadi, Floyd 0. Slate, and Arthur H. Nilson

Publication: Journal Proceedings

Volume: 82

Issue: 5

Appears on pages(s): 657-664

Keywords: compressive strength; concretes; cracking (fracturing); creep prop-erties;deformation; failure mechanisms; high-strength concretes; loads (forces);strains; stresses.

Date: 9/1/1985

Abstract:
The behavior of high-strength concrete subject to high sustained compressive stresses was studied experimentally and compared with that of low- and normal-strength concretes. Various forms of stress-strain time relationships were obtained. The long-term sustained strengths were established for these materials and were found to be preater (as percent off,’ > for high-strength than for low-strength concretes by about .5 to 10 percent. The time-dependent deformations were maximum at the vicinity of the sustained strength and were greater the lower the strength of concrete. A hypothesis on the mechanism of failure under sustained loading is presented which states that a critical stage of cracking is initiated by high sustained loads on attaining a critical strain limit that correlates closely with strain at maximum stress in short-time tests.