Reduction of the calcium leaching rate of cement paste by addition of silica nanoparticles
Reduction of the calcium leaching rate of cement paste by addition of silica nanoparticles
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DOI：
10.1016/j.cemconres.2008.03.021
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发表时间：
2008-08-01
影响因子：
11.4
通讯作者：
Guerrero, A.
中科院分区：
文献类型：
--
作者：
Gaitero, J. J.;Campillo, I.;Guerrero, A.
钙浸出是一种降解过程，由于钙离子迁移到侵蚀性溶液中，导致水泥浆逐渐溶解。虽然这是一个众所周知的现象，但还没有找到一种减少它的方法。这项工作的目的是证明在水泥浆中加入少量二氧化硅纳米颗粒是如何诱导这种还原的。实验结果表明，纳米二氧化硅可使固化后的水泥浆体强度提高30%左右，渐滤后的水泥浆体强度提高100%以上。在C-S-H凝胶的结构水平上，二氧化硅纳米颗粒增加了硅酸盐链的平均长度，并随着钙的溶解减少了它们的聚合。在孔隙率和钙损失量方面也观察到降解的重要减少。(C) 2008 Elsevier Ltd版权所有。
Calcium leaching is a degradation process that consists in the progressive dissolution of the cement paste as a consequence of the migration of the calcium ions to the aggressive solution. Although it is a well known phenomenon, a way of reducing it has not been found yet. The aim of this work is to prove how the addition of small amounts of silica nanoparticles to the cement paste can induce such reduction. The experimental results obtained have shown that nanosilica increases the strength of the cement paste about a 30% in cured samples and more than a 100% in the asymptotically leached ones. At the level of the structure of the C-S-H gel, silica nanoparticles increase the average length of the silicate chains and reduce their polymerization as calcium dissolves. An important decrease of the degradation in terms of porosity and amount of calcium lost has also been observed. (C) 2008 Elsevier Ltd. All rights reserved.