Characterization of Contact-Type Defects in Mortar Using a Nonlinear Ultrasonic Method

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="8"><hr/></td></tr><tr class="thead"><td class="align_left">Crack length (mm)</td><td class="align_center">0.4</td><td class="align_center">0.5</td><td class="align_center">0.6</td><td class="align_center">0.7</td><td class="align_center">0.8</td><td class="align_center">0.9</td><td class="align_center">1</td></tr><tr><td class="thead-hr" colspan="8"><hr/></td></tr><tr><td class="align_left">Coefficient of determination <i>R</i><sup>2</sup></td><td class="align_center">0.999</td><td class="align_center">1</td><td class="align_center">1</td><td class="align_center">1</td><td class="align_center">0.995</td><td class="align_center">0.993</td><td class="align_center">0.998</td></tr><tr class="table-tr"><td colspan="8"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The coefficient of determination <i>R</i><sup>2</sup> for the linear fitting of <i>A</i><sub>1</sub> and <i>A</i><sub>2</sub>.</div>

Advances in Materials Science and Engineering

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Table 2

Table 2: Characterization of Contact-Type Defects in Mortar Using a Nonlinear Ultrasonic Method 