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Hydration mechanisms of super sulphated slag cement

机译：超硫酸盐矿渣水泥的水化机理

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The hydration and the strength evolution of supersulphated cements (SSC) produced by the activation of two different ground granulated blast furnace slags with anhydrite and small amounts of an alkaline activator have been investigated. The main differences between the two mixtures are found to be the strength development, the dissolution rate of the slags, the amount and volume of the individual hydration products formed and the growth mechanisms of the ettringite. The chemical composition of the slag had a large influence on the amount of the hydrates formed and thus on the volume of the hydrated slag. Advancement of the amount of hydrates of a slag with low reactivity by adding aluminium sulphate and calcium hydroxide did increase the amount of ettringite. Nevertheless, the early compressive strength was not increased, but late strength shows a slow increase. It was concluded that the early compressive strength of an SSC using low reactive slag cannot be overcome by adding stoichiometric amounts of constituents which are used for the formation of a specific hydration product. The best way to increase early compressive strength is to increase the intrinsic dissolution rate.
机译：已经研究了由两种不同的粒状高炉矿渣用硬石膏和少量碱活化剂活化而产生的超硫酸盐水泥（SSC）的水合和强度演变。发现两种混合物之间的主要区别在于强度的发展，炉渣的溶解速率，形成的各个水合产物的量和体积以及钙矾石的生长机理。炉渣的化学组成对所形成的水合物的量具有很大的影响，因此对水合炉渣的体积具有很大的影响。通过添加硫酸铝和氢氧化钙来提高低反应性炉渣的水合物的量确实增加了钙矾石的量。然而，早期的抗压强度没有增加，但是后期的强度却显示出缓慢的增加。结论是，通过添加化学计量量的用于形成特定水合产物的成分不能克服使用低反应性炉渣的SSC的早期抗压强度。增加早期抗压强度的最佳方法是增加固有溶解速率。

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