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Alternative prime materials for developing new cements: Alkaline activation of alkali aluminosilicate glasses
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| 【文章作者】Ruiz-Santaquiteria, C.;Fernandez-Jimenez, A.;Palomo, A. |
| 【文章摘要】 This study explored the use of alkali aluminosilicate glass obtained by melting and quenching common clay, feldspar and fluxing oxides as a possible starting material for alkaline activation. The glass was synthesized at two different temperatures (1250 and 1400 degrees C), using Na2O (8 wt%) as a fluxing oxide. The effect of including small amounts of calcium in the starting mix (5.6 wt% of CaO) was likewise studied. The alkaline activation of such glasses yielded cements with high compressive strength (65 MPa after 20 h at 85 degrees C). The presence of calcium in the vitreous network favored the formation of a very compact cementitious matrix. TEM-EDX analyses showed that the gel forming in these systems was compositionally (and presumably structurally) non-uniform, with some local high-calcium, high Si/Al ratio (CASH-type gel) areas co-existing with low calcium and low Si/Al ratio clusters (NASH-type gel). (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
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【卷】42 【ISSUE】8 【ISSUEID】815C0073
【文章期份】2016
【发布日期】2016/8/11 17:03:57
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