Hydration of Portland Cement
Hydration of Portland Cement
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DOI：
10.1038/207713a0
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发表时间：
1965
期刊：
影响因子：
64.8
通讯作者：
A. K. Chatterji;R. Rawat
中科院分区：
文献类型：
--
作者：
A. K. Chatterji;R. Rawat
此外，研究表明波特兰水泥熟料与水之间的反应是半导体表面反应，可能是“p”型半导体上的“n”型反应*。因此，熟料矿物的水合是发生在熟料晶体（可能是半导体）表面的化学吸附过程。因此，波特兰水泥熟料参与的水合作用（和类似的反应）应由矿物中费米能级的瞬时位置控制（另见参考文献 3）。本文将表明，与石灰的情况一样，热电子发射开始的温度越低，熟料矿物与水的反应性越高。这意味着熟料晶体中费米能级的位置越高，熟料与水的反应性越大。因此，熟料矿物中费米能级的位置控制着硅酸盐水泥的水化速率。这与之前提出的理论*一致。使用与早期实验*中使用的相同的水泥熟料进行熟料，并使用通过无水酒精反复洗涤除去石灰后通过 BS 300 筛的部分。氧化物、三氧化二铬、钼和锰的氧化物以及石灰和氧化镍（氧化钼是通过加热钼酸铵得到的，锰是通过加热得到的）
Furthermore, it has been shown that the reaction between Portland cement clinker and water is a semiconductor surface reaction, probably “n” type reaction on “p” type semiconductor*. Hydration of clinker minerals is, therefore, a chemisorption process occurring on the surface of clinker crystals (which, may be semiconductors). Thus hydration (and similar reactions), in which Portland cement clinker takes part, should be controlled by the instantaneous position of Fermi-level in the minerals (see also ref. 3). It will be shown in this article that, as in the case of lime", the lower the temperature at which thermionic emission starts from. clinker minerals, the higher is its reactivity with water. This means that the higher the position of the Fermi-level in clinker crystals the greater is the reactivity of the clinker with water. Thus the position of Fermi-level in clinker minerals controls the rate of hydration of Portland cement. This is in agreement with the theories put forward earlier*. Experiments were carried out with the same cement clinker used in earlier experimonts*. The clinker was powdered and the fraction passing a BS 300 mesh sieve was used once it had been freed of lime by repeated washing with absolute alcohol. Specimens used were (a) clinker,(b) clinker heated at 1,000 C for 4 h,(c) clinker heated with admixture of 1 per cent by weight, individually, of the following oxides: zinc oxide, chromic sesquioxide, oxides of molybdenum and manganese and lime and nickel oxide (the molybdenum oxide was obtained by heating ammonium molybdate, and the manganese