Experimental Investigation of MgAl-NO2 and MgAl-CO3 LDHs on Durability of Mortar and Concrete

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Types</td><td class="align_center" rowspan="2">Molecular formula</td><td class="align_center" colspan="2">Electron microscopic mean particle size (μm)</td><td class="align_center" rowspan="2">Specific surface area (m2/g)</td><td class="align_center" rowspan="2">Whiteness (%)</td><td class="align_center" rowspan="2">Heavy metal (in Pb) (w/%)</td></tr><tr class="thead"><td class="align_center">D50</td><td class="align_center">D90</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">MgAl-CO3 LDHs</td><td class="align_center">Mg4Al2(OH)12CO3·mH2O</td><td class="align_center">≤5</td><td class="align_center">≤10</td><td class="align_center" rowspan="2">≥10</td><td class="align_center">≥90</td><td class="align_center" rowspan="2">≤0.001</td></tr><tr><td class="align_left">MgAl-NO3 LDHs</td><td class="align_center">Mg2Al(OH)6NO3·mH2O</td><td class="align_center">≤10</td><td class="align_center">≤20</td><td class="align_center">≥80</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Main technical indexes of LDHs.</div>

Advances in Materials Science and Engineering

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Table 3

Table 3: Experimental Investigation of MgAl-NO2 and MgAl-CO3 LDHs on Durability of Mortar and Concrete