Influence of silica fume on the microstructure of cement pastes: New insights from 1H NMR relaxometry
Influence of silica fume on the microstructure of cement pastes: New insights from 1H NMR relaxometry
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DOI：
10.1016/j.cemconres.2015.04.005
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发表时间：
2015-08-01
影响因子：
11.4
通讯作者：
McDonald, P. J.
中科院分区：
文献类型：
--
作者：
Muller, A. C. A.;Scrivener, K. L.;McDonald, P. J.
用H-1核磁共振表征了硅灰含量为10wt%的白色硅酸盐水泥浆体。样品在整个水合过程中被密封测量，而不需要样品干燥。根据H-1核磁共振信号强度和松弛分析计算了糊料组成和C-S-H特征。并将研究结果与纯白水泥浆体的类似研究结果进行了比较。硅灰的存在对C-S-H的密度影响不大，但对其化学组成有影响。在白水泥中掺入10%硅灰，密闭水化28d后，C-S-H的Ca/(Si+Al)比为1.33，H2O/(Si+Al)比为1.10。观察到C-S-H随时间的致密化。与纯白水泥浆体相比，硅灰水泥浆体的毛细管、C-S-H凝胶和层间孔大小没有明显变化。然而，在硅灰共混物中，凝胶/层间水比增加。(C)2015爱思唯尔有限公司。保留所有权利。
H-1 NMR has been used to characterise white Portland cement paste incorporating 10 wt.% of silica fume. Samples were measured sealed throughout the hydration without sample drying. Paste compositions and C-S-H characteristics are calculated based on H-1 NMR signal intensities and relaxation analysis. The results are compared with a similar study of plain white cement paste. While the presence of silica fume has little influence on C-S-H densities, the chemical composition is impacted. After 28 days of sealed hydration, the Ca/(Si + Al) ratio of the C-S-H is 1.33 and the H2O/(Si + Al) ratio is 1.10 when 10% of silica fume is added to the white cement. A densification of the C-S-H with time is observed. There are no major changes in capillary, C-S-H gel and interlayer pore sizes for the paste containing silica fume compared to the plain white cement paste. However, the gel/interlayer water ratio increases in the silica fume blend. (C) 2015 Elsevier Ltd. All rights reserved.