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산업부산물 바인더와 산업부산물 골재 기반 탄소중립형 고인성 무시멘트 복합체
주수환 ( Ju Suhawn ),강민창 ( Kangminchang ),표석훈 ( Pyo Sukhoon ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
본 연구에서는 바텀애시와 폴리에틸렌 섬유를 혼입하여 고로슬래그 기반의 탄소중립형 고인성 무시멘트 복합체를 개발하였다. 고인성 무시멘트 복합체의 인장성능과 지속가능성을 향상시키기 위해 전처리된 바텀애시와 폴리에틸렌 섬유를 사용하 였으며, 바텀애시는 선행연구를 바탕으로 전처리되었다. 선행연구의 기법을 통해 알칼리 활성화제의 실리카 공급원으로 바텀애시를 활용할 뿐만 아니라 잔류된 바텀애시를 잔골재로 대체하여 천연골재가 사용되지 않은 탄소중립형 고인성 무시멘트 복합체를 제작하였다.
Characteristics of GGBFS-Based Pervious Concrete Considering Rheological Properties of the Binder
Yanchen Oinam,주수환,권성우,신명수,표석훈 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.1
To mitigate environmental challenges, such as urban flooding, noise pollution, and the urban heat island effect, pervious concrete has been developed. This research was intended to develop pervious concrete made from ground granulated blast furnace slag (GGBFS) to further decrease the environmental impact of the construction sector by reducing the content of ordinary Portland cement (OPC). The primary objective of the mix proportion was to maximize water permeability while meeting the required compressive strength. Two levels (60 and 100%) of OPC replacement by GGBFS were evaluated and compared to OPC-only concrete, and two target porosities (10 and 15%) were achieved by modifying the binder-to-aggregate ratio. CaO and CaCl2 were utilized as an activator and an accelerator, respectively, for the GGBFS only binder. Characteristics of the pervious concrete were determined with the compressive strength, porosity and water permeability test. Meanwhile, the effects of the rheological properties of binders on the water permeability and compressive strength of pervious concretes was evaluated. According to the results, the permeability of pervious concretes always exhibited a positive correlation with porosity, regardless of binder type. Although, the pervious concrete made with CaO-activated GGBFS has a lower compressive strength than the other two cases (60% GGBFS and only OPC), it still meets the minimum strength requirement. Based on the rheology studies of binder, it was found that, the adhesion force of the binder and the compressive strength of the pervious concrete decreases, as evaluated by rheology studies on binders. The CT scan revealed that when the adhesive force of the binder was weaker, the local porosity was higher (i.e., pore volume was larger) at the bottom of the specimen, which might be due to the limited consolidation and compaction of the binder between aggregate particles at the bottom due to its higher plastic viscosity.