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Study of crack propagation in concrete under multiple loading rates by acoustic emission

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Abstract

It is of great importance to investigate the effect of multiple loading rates on the crack propagation of brittle material such as concrete using acoustic emission because engineering structures are subjected to multiple loading conditions. Although material behaviour under single loading mode has been extensively studied, very limited research has been conducted to investigate the performance of brittle materials subjected to varying loading conditions. This paper presents an experimental study of the effects of single and multiple strain rates on cement mortar samples using acoustic emission. A total number of 81 concrete specimens were tested, in this 28 samples were tested in constant strain rate, whereas rest 53 samples were tested in multiple loading rates. Axial strain, lateral strain and acoustic emission counts were recorded continuously until the specimens had failed. The results showed that concrete behaves differently under multiple loading rates. Acoustic emission was in close agreement with the crack propagation and damage of concrete samples.

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Abbreviations

ε:

Strain

AE:

Acoustic emission

ωAB :

The acoustic emission cumulative damage parameter

f c :

Crack damage threshold

σ:

Axial stress

N:

Accumulated number of AE

C:

Integration constant

a, b, m and B:

Empirical constants

D:

Damage at the ultimate strength

D0 :

Initial damage

Dc :

Damage at ultimate strain

A0 :

Threshold amplitude of the measuring system

E:

Young’s modulus of a damaged material

E* :

Young’s modulus of an intact material

D:

Damage at the ultimate strength

SR1:

Strain rate 1

SR2:

Strain rate 2

w:

Damage parameter

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Authors and Affiliations

  1. Faculty of Science and Technology, Federation University Australia, Ballarat, VIC, 3353, Australia

    Manoj Khandelwal

  2. Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC, 3800, Australia

    P. G. Ranjith

Authors
  1. Manoj Khandelwal
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  2. P. G. Ranjith
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Correspondence to Manoj Khandelwal.

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Khandelwal, M., Ranjith, P.G. Study of crack propagation in concrete under multiple loading rates by acoustic emission. Geomech. Geophys. Geo-energ. Geo-resour. 3, 393–404 (2017). https://doi.org/10.1007/s40948-017-0067-1

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  • DOI: https://doi.org/10.1007/s40948-017-0067-1

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