• Title/Summary/Keyword: 알카리

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An Experimental Study on Early Strength and Drying Shrinkage of High Strength Concrete Using High Volumes of Ground Granulated Blast-furnace Slag(GGBS) (고로슬래그 미분말을 대량 사용한 고강도 콘크리트의 조기강도 및 길이변화 특성에 관한 실험적 연구)

  • Yang, Wan-Hee;Ryu, Dong-Woo;Kim, Woo-Jae;Park, Dong-Cheol;Seo, Chee-Ho
    • Journal of the Korea Institute of Building Construction
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    • v.13 no.4
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    • pp.391-399
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    • 2013

  • For high strength concrete of 40~60 MPa, the effects on the early strength and concrete dry shrinkage properties replacing 60~80% of Ordinary Portland Cement with Blast Furnace Slag Powder and using the Alkali Activator (Modified Alkali Sulfate type) are considered in this study. 1% Alkali Activator to the binder, cumulative heat of hydration for 72 hours was increased approximately 45%, indicating that heat of hydration contributes to the early strength of concrete, and the slump flow of concrete decreased slightly by 3.7~6.6%, and the 3- and 7- strength was increased by 8~12%, which that the Alkali Activator (Modified Alkali Sulfate type) is effective for ensuring the early strength when manufacturing High Strength Concrete (60%) of Blast Furnace Slag Powder. Furthermore, the dry shrinkage test, both 40 MPa and 60 MPa specimens had level of length changes in order of BS40 > BS60 > BS60A > BS80A, and the use of the Alkali Activator somewhat improved resistance to dry shrinkage.

  • https://doi.org/10.5345/JKIBC.2013.13.4.391 인용 PDF KSCI