Stress-Strain Response of Microcracked Concrete in Direct Tension

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Title: Stress-Strain Response of Microcracked Concrete in Direct Tension

Author(s): Farhad Ansari

Publication: Materials Journal

Volume: 84

Issue: 6

Appears on pages(s): 481-490

Keywords: concretes; cracking (fracturing); crack width and spacing; deformation; lasers; measurement; microcracking; mechanical properties; stress-strain relationships; tensile strength; Materials Research

Date: 11/1/1987

Abstract:
Behavior of concrete subjected to uniaxial tension is studied by laser speckle interferometry. The main emphasis is given to development of a technique for detection of microcracks, measurements of the width of microcracking zone, and calculating microcrack growth. Microcrack-macrocrack evolution is described from experimental results. Unique post-peak stress-strain and stress-deformation behavior were not observed. The stress-strain response of concrete was found to be gage-length dependent. Strains measured within a gage length inside the microcracking zone were two orders of magnitude higher than the values measured previously.