Alkali-activated cements and concretes by Krivenko, P. V.; Roy, D. M.; Shi, Caijun

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By Krivenko, P. V.; Roy, D. M.; Shi, Caijun

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2. Type III indicates that Al2 O3 has an adverse effect on the hydraulic index. K12 was proposed based on 28-day strengths and K13 based on strengths after 28 days. The presence of some minor components can also affect the hydraulic reactivity of slag. 5% S2− ), had a favourable effect on the hydraulic activity of blast furnace slag (Shkolnick 1986). The further increase of S2− content did not show any difference. This may be because S2− causes disorder of the network. Ti exists in six-coordination when TiO2 content is less than 4% and in four-coordination when TiO2 content is higher than 4% (Smolczyk 1980).

Demoulian et al. (1980) found that a glass content of less than 70% is acceptable, and Schwiete and Dolbor (1963) even felt that 30–40% glass content was also acceptable. Coale et al. (1973) suggested that the minimum glass content of quenched slag should be 85% for the assessment of slag as a potential cement replacement. Smolczyk (1980) stated that the presence of finely distributed crystals would have little detrimental effect on strength because these finely distributed crystals could remain partially or completely encapsulated in reactive glass even when ground to cement fineness.

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. 6 MPa. The compressed air should be turned on before pouring the molten slag. The slag is blown into small particles with size ranging from 3 to 5 mm and fall into a pond filled with water. This process is very simple and has no secondary environmental pollution. However, most metals are oxidized during the air-quenching process.

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