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研究了硅酸盐水泥水化动力学与水化过程中水化硅酸钙(C-S-H)形成之间的相互作用。结果表明:水泥水化反应过程中的液相组成对C-S-H的成核与生长速率有很大的影响。因此,对于不同的水泥,C_3S、C_2S和方解石表面的无序纳米C-S-H颗粒团聚体的结构变化很大;掺加矿物掺合料和温度变化对此也有很大影响。C-S-H的化学组成直接取决于液相组成。硅酸盐水泥水化诱导期由C-S-H的成核速率决定。同时,水泥1 d的水化程度主要与C-S-H生长模式和速率有关;影响水泥1 d水化程度的因素主要是C-S-H生长的速率和模式,以及水分子和离子透过水泥颗粒表面已形成的C-S-H层的渗透性。因此,如果调控C-S-H成核和生长的速率的参数已知,则可以有效地控制硅酸盐水泥的早期水化,特别是可有效提高水泥水化程度,在可持续发展理念的基础上达到水泥的高效利用。
Abstract：A mutual interaction occurs between the kinetics of the hydration of Portland cement and hydrated calcium silicate(C-S-H)formed as a result of the chemical reactions involved.The results show that the liquid phase composition that also depends on the occurring chemical reactions has a major impact on the nucleation and growth rates of C-S-H.As a consequence,the structure of the agglomerates of unordered C-S-H nanometric particles on C_3S,C_2S or calcite surfaces will vary from a Portland cement to another one but also in the presence of admixtures or with temperature variations.The stoichiometry of C-S-H also directly depends on the liquid phase composition.On the other hand,the induction period found during Portland cement hydration is governed by the rate of nucleation of C-S-H.Also,the percentage of hydration reached at 1 d is principally correlated to the rate and mode of growth of C-S-H and then to the permeability of water molecules and ions through the layer of C-S-H formed on cement grains.Once the parameters that enable us to tune C-S-H nucleation and growth are known,it is thus possible to master more efficiently the early hydration of Portland cement and especially reach higher percentages of reaction leading to a more efficient use of cement in the logic of sustainable development.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2015.10.03
中图分类号:TQ172.11
引用信息:
[1]Denis DAMIDOT,Christine LORS.水泥水化与水化硅酸钙的结构和化学组成之间的相互作用（英文）[J].硅酸盐学报,2015,43(10):1324-1330.DOI:10.14062/j.issn.0454-5648.2015.10.03.
2015-10-15
2015-10-15