Accession Number : AD0695719

Title :   CRITICAL NORMAL FRACTURE STRAIN OF PLAIN AND STEEL WIRE FIBROUS- REINFORCED CONCRETE

Descriptive Note : Final rept.

Corporate Author : CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL

Personal Author(s) : Birkimer, Donald L

PDF Url : AD0695719

Report Date : Oct 1969

Pagination or Media Count : 212

Abstract : The report presents the results of a series of eighty-one impact tests performed on 5.1 x 88.9-cm (2.0 x 35.0-in.) cylindrical test specimens. The cylinders consisted of either plain or steel wire fibrous-reinforced concrete. Basic properties relating to the concrete test specimens used were quantitatively evaluated: static ultimate tensile strength and the corresponding ultimate tensile strain; static initial Young's modulus of elasticity; static ultimate unconfined compressive strength, specific gravity, mass density; seismic velocity; dynamic Young's modulus of elasticity. Histograms for the frequency distributions of basic material properties show variations of these properties within the experiment. The results revealed that the critical normal fracture strain (critical value of tensile strain which causes fracture of the material) of the materials tested is functionally dependent on the rise times of the straining pulse. The results also showed that the critical normal fracture strain of plain concrete can be increased by the inclusion of the randomly placed steel wire fibre of the type tested.

Descriptors :   *FIBERS, *REINFORCED CONCRETE, COMPRESSIVE PROPERTIES, FLEXURAL STRENGTH, FRACTURE(MECHANICS), IMPACT TESTS, MILITARY REQUIREMENTS, MODULUS OF ELASTICITY, REINFORCING MATERIALS, STANDARDS, STEEL, STRAIN(MECHANICS), SYNTHETIC FIBERS, TENSILE PROPERTIES, WIRE

Subject Categories : Laminates and Composite Materials
      Civil Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE