By Krivenko, P. V.; Roy, D. M.; Shi, Caijun
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Additional info for Alkali-activated cements and concretes
Several steel plants used the water-quenching process and the Qiangtao steel plant in Qingtao, China is still using the water-quenching method to process steel slag. Water-quenched steel slag consists of particles from 3 to 5 mm (Zhu et al. 1989). Air-quenching process was recently developed by Chongqing Iron and Steel Co. Ltd, Chongqing, China, and is being used in several steel plants in China (Ye and Liao 1999). Basically, the molten steel slag in slag cart is poured into a slot, underneath which there is an air nozzle.
Other researchers felt that the crystals, such as merwinite, were mostly encapsulated in glass and their presence made the glass particles more reactive (Demoulian et al. 1980, Frearson and Uren 1986). Glukhovsky and Krivenko (1981) suggested that hydraulic activity of slag (especially in the presence of an alkali) would depend upon a combination of physical, chemical and structural peculiarities of both the vitreous and crystalline phases in the slag. Most standards in the world do not specify the glass content except the British Standard that requires a minimum glass content of 90% (Mehta 1986).
1980). 1995, Geiseler 1996). The Ministry of Transportation of Ontario, Canada, banned the use of steel slag in asphalt concrete on provincial highways in 1993 because of the soundness problem. 5 Cementing properties of steel slag The presence of C3 S, C2 S, C4 AF and C2 F contributes to the cementitious property of steel furnace slag. 8 summarizes the relationship between basicity, main mineral phase and hydraulic reactivity of steel slag. It can be seen that the reactivity of steel slag increases with its basicity.