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Wang B.,Beijing University of Chemical Technology | Liu J.,Beijing University of Chemical Technology | Luo X.,Beijing University of Chemical Technology | Zhu G.,China Metallurgical Group Architecture Research Institute Co. | And 2 more authors.
Beijing Huagong Daxue Xuebao (Ziran Kexueban)/Journal of Beijing University of Chemical Technology (Natural Science Edition) | Year: 2011

The glycol-TG method has been investigated as a means of determining the content of free CaO in steel slag. Glycol was used to measure the content of pure CaO, pure MgO and pure Ca(OH)2. TG-DTA analysis was used to analyze steel slag, with a specific surface area of 500 m2/kg, after different hydration times. Samples of steel slag containing different quantities of Ca(OH)2 were also tested by TG-DTA. The results indicate that the glycol method can be used to give an accurate measure of the content of free CaO and Ca(OH)2 in the steel slag, whilst the TG-DTA method can give an exact measure of the content of Ca(OH)2 in the steel slag. The difference between these two values is the content of free CaO. Therefore, the content of free CaO in steel slag can be measured by the combined glycol-TG method, with a precision of more than 95%. This method has been employed to study hot splashing steel slag from the Xinyu Iron and Steel Company. The content of free CaO in this hot splashing steel slag was found to be 3.17%.


Luo X.,Beijing University of Chemical Technology | Liu J.,Beijing University of Chemical Technology | Wang B.,Beijing University of Chemical Technology | Zhu G.,China Metallurgical Group Architecture Research Institute Co. | Lu Z.,China Metallurgical Group Architecture Research Institute Co.
Beijing Huagong Daxue Xuebao (Ziran Kexueban)/Journal of Beijing University of Chemical Technology (Natural Science Edition) | Year: 2011

The effect of different accelerators on the early strength of steel slag cementitious materials has been studied. The results show that though inorganic accelerators can improve early strength of steel slag cementitious materials, 28d strength of the steel slag cementitious materials decreased. Calcium formate, triethanolamine, sodium acetate and urea had almost no effect on the early strength of steel slag cementitious materials, and combinations of these organic accelerators also had no effect. A combination of semi-hydrated gypsum/sodium nitrite (1%/0.67%) and urea (0.22%) afforded some increase in 3d strength of steel slag cementitious materials, and 28d strength of steel slag cementitious materials declined by less by 11%.

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