순환골재 미분말을 알칼리 자극제로 활용한 고로슬래그 미분말 혼입 콘크리트의 강도증진에 관한 실험적 연구 (A Experimental Study on the Strength Improvement of Ground Granulated Blast Furnace Slag Concrete Using Recycled Aggregate Powder as Alkali-activator)

서지정보

· 발행기관 : 한국건축시공학회
· 수록지 정보 : 한국건축시공학회지 / 17권 / 6호 / 527 ~ 534페이지
· 저자명 : 전찬수, 류동우

초록

본 연구에서는 순환골재 생산시 발생되는 미분말을 고로슬래그 미분말의 알칼리 자극제로 활용하기 위해 배합수에일부 혼입하여 강알칼리성을 띄게 한 후, 고로슬래그 미분말을 단계별로 치환한 콘크리트의 물리적 특성에 미치는 영향을 종합적으로 분석하였다. 그 결과 순환골재 미분말의 침지시간이 5시간일 때 전 시험편에서 가장 높은 pH가 측정되어알칼리 자극제로서 활용가능성이 가장 높은 침지 시간임을확인할 수 있었으며, 순환골재 미분말을 3% 혼입시킨 시험배합수가 1% 혼입시킨 배합수에 비하여 약 15mg/l이상의Ca(OH)2을 더 함유한 것으로 나타내었다. 순환골재 미분말을 혼입시킨 배합수를 사용한 경우 일반배합수를 사용한 경우와 비교하여 전 재령에서 강도발현이 더 우수한 것으로나타났으며, 조기재령과 장기재령 모두 순환골재 미분말의알칼리 자극효과가 있음을 확인할 수 있었다.

영어초록

Accordingly, this study, in order to use powder of recycled aggregate from production of recycled aggregate as anactivator of ground granulated blast furnace slag, the influence of added recycled aggregate powder on physical propertiesof concrete induced ground granulated blast furnace slag were analyzed by hydration stages. The results of the study aresummarized as follows: Except for samples eluted powder of recycled aggregate 1%, all the samples were high alkalisuspensions with higher than pH 12.0. In particular, when eluted time was 5 hours, the sample eluted powder of recycledaggregate 3% showed about 15 mg/l of calcium hydroxide that was not different from the amount of calcium hydroxide inthe mixing water eluted powder of recycled aggregate 5%. Hence, from this results, it can be considered that optimal elutedpowder of recycled aggregate was 3% in this study. When using mixing water eluted with powder of recycled aggregate,compared to use of ordinary mixing water, it showed greater compressive strength in the entire ages, and in the samplereplaced with ground granulated blast furnace slag by 50%, its compressive strength was greater than that of the OPC. Asuse of mixing water eluted with powder of recycled aggregate in concrete used with large amount of ground granulatedblast furnace slag was more effective for improving compressive strength than ordinary mixing water, it is verified thatpowder of recycled aggregate had an effect of activator.

참고자료

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