Comparative Study on Two Types of Nonpillar Mining Techniques by Roof Cutting and by Filling Artificial Materials

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left">Material</td><td class="align_center">Concrete</td><td class="align_center">Sand</td><td class="align_center">Gravel</td><td class="align_center">Water</td><td class="align_center">Fly ash</td><td class="align_center">Additive</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">Quality (kg)</td><td class="align_center">450</td><td class="align_center">800</td><td class="align_center">850</td><td class="align_center">226</td><td class="align_center">140</td><td class="align_center">1.2</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Concrete proportioning for flexible formwork pumping.</div>

Advances in Civil Engineering

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Table 2

Table 2: Comparative Study on Two Types of Nonpillar Mining Techniques by Roof Cutting and by Filling Artificial Materials 