Study of the Frost Resistance of HDFC Based on a Response Surface Model and GM (1,1) Model

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Factor</td><td class="align_center" colspan="3">Level</td></tr><tr class="thead"><td class="align_center">−1</td><td class="align_center">0</td><td class="align_center">1</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">PVA fiber content/A</td><td class="align_center">1</td><td class="align_center">1.5</td><td class="align_center">2</td></tr><tr><td class="align_left">Length of PVA fiber/B</td><td class="align_center">6</td><td class="align_center">9</td><td class="align_center">12</td></tr><tr><td class="align_left">Freeze-thaw times/C</td><td class="align_center">50</td><td class="align_center">100</td><td class="align_center">150</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Code and level of experimental factors.</div>

Advances in Materials Science and Engineering

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Table 3

Table 3: Study of the Frost Resistance of HDFC Based on a Response Surface Model and GM (1,1) Model 