Title: Strain-Rate Sensitivity of Concrete Mechanical Properties

Author(s): Jung-Heum Yon, Neil M. Hawkins, and Albert S. Kobayashi

Publication: Materials Journal

Volume: 89

Issue: 2

Appears on pages(s): 146-153

Keywords: concretes; mechanical properties; strain hardening; strains; Materials Research

DOI: 10.14359/2223

Date: 3/1/1992

Abstract:
A displacement-controlled dynamic fracture test system, which is capable of applying strain rates as high as 0.24 sec-1, was used to generate dynamic fracture data for three-point bend concrete specimens. The fracture data were used interactively with a dynamic finite element code to deduce the dynamic mechanical properties of concrete. This analysis showed that the tensile strength of concrete and its modulus of elasticity increased with increasing strain rate. At the maximum applied strain rate of 0.24 se-1 the tensile strength was 110 percent greater, and the compressive and tensile moduli of elasticity were 41 and 60 percent greater, respectively, than their value for static loading. However, the fracture energy density did not change with strain rate and remained constant at 0.866 lb/in.