摘要(英) |
Reductive slag and oxide slag are the by-products of electric arc furnace (EAF) steel-making. Reductive slag shows a chemical composition similar to cement and blast furnace slag, and can be activated with alkaline as a binder for concrete. Also, after an appropriate processing, slag aggregates can be used in certain cases to replace part or all of the natural aggregates for making concrete.
Laboratory test results show that mixed slag consisting of 70% blast furnace slag and 30% reductive slag, with the activation by sodium silicate and sodium hydroxide, can be used as binder for producing concrete with design 28-day compressive strength in the range of 140 - 210 kgf/cm2. Electric arc furnace slag aggregates can be used to replace part or 100% of the natural aggregate in the production of alkali-activated slag concrete. It was found that the concrete made with activated slag as binder and steel-making slag as aggregate did not show adverse effects on the drying shrinkage. Also, the concrete exhibited no potential for alkali-aggregate reaction. Finally, partial replacement of the fine aggregate with the ceramic milling sludge can effectively improve the slump of alkali-activated slag concrete.
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參考文獻 |
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