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RESULTS AND DISCUSSION Table 2 presents different castables¡¯ physical properties (permanent linear change - PLC, apparent porosity - AP, apparent density - AD and pore volume attained by SEM images). Both expansion (PLC) and porosity scaled with the MgO grain size increase (AM100 > AM45 > AM13), whereas the density decreased for the expansion free testing condition, after firing at 1500¡ãC for 5 hours. The unfavorable association of such properties (large pores with high porosity) resulted in a deeper slag penetration (expansion free, 18.2 % of infiltration) as showed in Figure 3. This figure also highlights that the penetration index scaled with the expansion (AM13 < AM45 < AM100) for the expansion free firing condition, whereas the results were much closer when a constraining effect was considered. Table 2 - Physical properties (permanent linear expansion, apparent porosity, apparent density, pore volume) for castables with different expansion levels (AM13, AM45 and AM100), fired at 1500¡ãC for 5 hours, in expansion free or under constraint conditions, and their percentage difference when comparing both situations. |
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Ó¢ÓïÁô¼¶Éú: ½ð±Ò+8, ·ÒëEPI+1 2014-09-13 21:10:15
RXMCDM: ½ð±Ò+1, ¶àлӦÖú£¡ 2014-09-13 17:44:46
Ó¢ÓïÁô¼¶Éú: ½ð±Ò+8, ·ÒëEPI+1 2014-09-13 21:10:15
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