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Title |
The Properties of Flow and Compressive Strength of Mortar According to Replacement Ratio of Rapidly-Chilled Steel Slag Fine Aggregate
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Keywords |
급냉 제강 슬래그; 통계분석; 플로우; 압축강도; 고성능감수제 첨가율; 물-시멘트비; rapidly-chilled steel slag; statistical analysis; flow; dosage of SP |
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Abstract |
The steel slag, a by-product which is produced by refining pig iron during the manufacture of steel, is mainly used as road materials after aging. It is necessary to age steel slag for long time in air because the reaction with water and free-CaO in steel slag could make the expansion of volume. This problem prevents steel slag from being used as aggregate for concrete. However, steel slag used in this study was controled by a air-jet method which rapidly cools substance melted at a high temperature. The rapidly-chilled method would prevent from generation of free-CaO in steel slag. This study dealt with the influence of the using rate of rapidly-chilled steel slag on flow, dosage of SP, W/C ratio, and strength of mortar by statistical experimental design. Also, the results of this experiment were approved by statistical analysis methods, such as analysis of variance and F-testing. As results of F-testing, this paper proved at 1% level of significance that the more the using rate of rapidly-chilled steel slag increased, the more this affected the enhancement of flow, the decrease of dosage of SP and W/C ratio, and the development of compressive strength. Also, considering the fluidity and compressive strength of mortar, it is desirable to use 75% of rapidly-chilled steel slag for river sand.
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