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The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

机译：炉渣中氧化铝含量的作用，加上硫酸盐对波特兰水泥 - 渣混合物水化和微观结构的影响

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The effects on composite cements of the aluminium content of slag, plus that of additional sulfate, have been investigated. Samples containing cement or composites with 40% replacement by one of 2 different slags, differing in aluminium contents, were prepared. A further blended sample was prepared with additional anhydrite replacing 3% w/w of binder. Slag blended mortars showed comparable strengths to the neat cement system at later ages. Adding slag changed the hydration kinetics of the clinker phases. The addition of sulfate had no effect on slag reactivity but increased that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and encouraged the presence of hemicarboaluminate over monocarboaluminate. The Ca/Si ratios of the C-S-H formed were comparable between the two blends, being marginally lower than that of the neat system. The addition of anhydrite resulted in the adsorption of sulfate onto the C-S-H, plus stabilisation of ettringite.
机译：研究了炉渣中铝含量以及其他硫酸盐含量对复合水泥的影响。制备了包含水泥或复合材料的样品，其中铝含量不同的2种不同炉渣之一替代了40％。用另外的硬石膏代替3％w / w的粘合剂制备另一种混合样品。矿渣掺合砂浆在后期使用时的强度与纯水泥系统相当。添加矿渣改变了熟料相的水合动力学。硫酸盐的添加对炉渣的反应性没有影响，但是增加了阿利特的。富含铝的炉渣导致铝更多地掺入C-S-H中，并促使半碳铝酸盐比单碳铝酸盐存在。两种混合物之间形成的C-S-H的Ca / Si比相当，略低于纯体系。添加无水石膏导致硫酸盐吸附在C-S-H上，并稳定了钙矾石。

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