Surface Wave Velocity-Stress Relationship in Uniaxially Loaded Concrete

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Standard

Surface Wave Velocity-Stress Relationship in Uniaxially Loaded Concrete. / Shokouhi, Parisa; Zoëga, Andreas; Wiggenhauser, Herbert; Fischer, Gregor.

In: A C I Materials Journal, Vol. 109, No. 2, 2012, p. 141-148.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Harvard

Shokouhi, P, Zoëga, A, Wiggenhauser, H & Fischer, G 2012, 'Surface Wave Velocity-Stress Relationship in Uniaxially Loaded Concrete' A C I Materials Journal, vol 109, no. 2, pp. 141-148.

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CBE

MLA

Vancouver

Author

Shokouhi, Parisa; Zoëga, Andreas; Wiggenhauser, Herbert; Fischer, Gregor / Surface Wave Velocity-Stress Relationship in Uniaxially Loaded Concrete.

In: A C I Materials Journal, Vol. 109, No. 2, 2012, p. 141-148.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{2294d9c4a3ad45619629fc49961a3ac2,
title = "Surface Wave Velocity-Stress Relationship in Uniaxially Loaded Concrete",
keywords = "Acoustic emission, Acoustoelasticity, Microcracking, Surface waves, Velocity measurement",
publisher = "American Concrete Institute",
author = "Parisa Shokouhi and Andreas Zoëga and Herbert Wiggenhauser and Gregor Fischer",
year = "2012",
volume = "109",
number = "2",
pages = "141--148",
journal = "A C I Materials Journal",
issn = "0889-325X",

}

RIS

TY - JOUR

T1 - Surface Wave Velocity-Stress Relationship in Uniaxially Loaded Concrete

A1 - Shokouhi,Parisa

A1 - Zoëga,Andreas

A1 - Wiggenhauser,Herbert

A1 - Fischer,Gregor

AU - Shokouhi,Parisa

AU - Zoëga,Andreas

AU - Wiggenhauser,Herbert

AU - Fischer,Gregor

PB - American Concrete Institute

PY - 2012

Y1 - 2012

N2 - The sonic surface wave (or Rayleigh wave) velocity measured on prismatic concrete specimens under uniaxial compression was found to be highly stress-dependent. At low stress levels, the acoustoelastic effect and the closure of existing microcracks results in a gradual increase in surface wave velocities. At higher stress levels, concrete suffers irrecoverable damage: the existing microcracks widen and coalesce and new microcracks form. This progressive damage process leads first to the flattening and eventually the drop in the velocity-stress curves. Measurements on specimens undergoing several loading cycles revealed that the velocities show a stress-memory effect in good agreement with the Kaiser effect. Comparing the velocities measured during loading and unloading, the effects of stress and damage on the measured velocities could be differentiated. Moreover, the stress dependency of surface wave velocity proved to be direction-dependent. The velocity increases and decreases the most when measured parallel and perpendicular to the loading axis, respectively.

AB - The sonic surface wave (or Rayleigh wave) velocity measured on prismatic concrete specimens under uniaxial compression was found to be highly stress-dependent. At low stress levels, the acoustoelastic effect and the closure of existing microcracks results in a gradual increase in surface wave velocities. At higher stress levels, concrete suffers irrecoverable damage: the existing microcracks widen and coalesce and new microcracks form. This progressive damage process leads first to the flattening and eventually the drop in the velocity-stress curves. Measurements on specimens undergoing several loading cycles revealed that the velocities show a stress-memory effect in good agreement with the Kaiser effect. Comparing the velocities measured during loading and unloading, the effects of stress and damage on the measured velocities could be differentiated. Moreover, the stress dependency of surface wave velocity proved to be direction-dependent. The velocity increases and decreases the most when measured parallel and perpendicular to the loading axis, respectively.

KW - Acoustic emission

KW - Acoustoelasticity

KW - Microcracking

KW - Surface waves

KW - Velocity measurement

JO - A C I Materials Journal

JF - A C I Materials Journal

SN - 0889-325X

IS - 2

VL - 109

SP - 141

EP - 148

ER -