• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.32-33
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• 2016

This purpose of this study is to find the properties of pore structure and length change of blast furnace slag cement added alkali powder stimulant on shrinkage reducing agent presence. In length change, the specimen added alkaline stimulant was smaller than normal blast furnace slag concrete. And the specimen added shrinkage reduction agent was confirmed to show smaller rate of length change than the length. In MIP analysis of 1day-age, 0.1㎛ subsequent pore amount of the specimen added alkaline stimulant was significantly smaller value the normal blast furnace slag concrete specimen.

• 한국건설순환자원학회논문집
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• 제5권1호
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• pp.103-110
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• 2010

최근 $CO_2$ 배출의 저감을 위한 활동으로 시멘트의 사용량을 줄이고, 고로슬래그 및 플라이 애시 등과 같은 산업부산물을 적극 활용하여 건설분야에 적용하고자 하는 움직임이 활발하게 진행되고 있으며, 이를 통해 환경부하저감 및 자원재활용을 도모하고 있다. 이에 본 연구에서는 자원재이용 및 환경부하저감을 위한 기초적 연구로서 고로슬래그 및 플라이 애시를 사용하여 부산물의 치환율에 따른 경화성상 및 내구성상을 비교 분석하고 고로슬래그와 플라이애시의 3성분계를 치환한 콘크리트 성상을 검토함으로서 결합재로서의 상성관계를 평가하여 향후, 대량활용을 위한 기초자료를 제시하고자 하였다. 고로슬래그 미분말 및 플라이애시를 대체한 콘크리트의 압축강도는 재령 7일 초기강도에서는 무혼입 콘크리트에 비해 현저히 낮은 수준으로 발현하고 있으나, 28일 이후에는 무혼입 콘크리트에 비해 유사하거나 높은 압축강도를 발현하였다. 또한 고로슬래그 미분말의 대체율이 증가함에 따라 염해 저항성이 향상되는 것으로 나타났으며, 이는 기존 연구결과에 따라 고로슬래그 미분말에 의해 염화물 이온이 콘크리트 표면에 고정화됨으로서 염해 저항성이 향상되는 것으로 판단된다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2002년도 학술발표회 발표논문집
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• pp.145-148
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• 2002

This study is performed to properties of low heat concrete using blast furnace slag powder and gypsum. The test result shows that the air content is in the range of $4.1%{\sim}5.1%$, the unit weight is in the range of $2,306kg/m^3{\sim}2,334kg/m^3$. The compressive strength of concrete mixed blast furnace slag(BFS) low than ordinary portland cement(OPC) at the curing age of 7days, but it is high or same at the curing age of 28days. And the natural gypsum shows superior compressive strength than the chemical gypsum.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.97-100
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• 2009

This study is a basic experiment to complement the problems in decrease of strength in case we change lots of fly ash("FA" here in after) in ordinary portland cement("OPC" here in after). Mixing plaster that is known to be effective in improvement in hydration of blast furnace slag powder("BS" here in after). After FA changed concrete is mixed, the study physical proporties such as compression strength, increased proportionaly. When second-class BS 5 % and gypsum 2 % changed, compare to OPC strength approximately 120 % was recorded after one day. In FA 20 % case, according to the ratio of gypsum changed results showed similar trend, but compared to FA 10 % changed concrete, expression strength improvement was lower.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.81-82
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• 2017

This study analyzed the compressive and flexural strength characteristics and the permeability coefficient of the trial product of amorphous metallic fiber reinforced porous block using high volume blast furnace slag powder.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.295-296
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• 2023

This study evaluated the compressive strength after making mortar with low cement composition for carbon-neutral steam curing to respond to climate change. Blast furnace slag, fly ash, and ultra-high powder fly ash were used as substitutes for cement. The cement substitute was used at 40% of the mass of cement, and after steam curing, the compressive strength was measured on the 1st, 3rd, 7th and 28th days of age. As a result of the experiment, at the age of 1 day, the mixture using only cement showed the highest strength, but from the 3rd day, the specimen using ultra-high powder showed a high strength development rate, followed by blast furnace slag and fly ash.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.151-152
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• 2023

Lightweight aggregates has a dry specific gravity of 2.0 or less, which is lower than natural aggregates. Lightweght aggregate is efficient for weight reduction but has low compressive strength. In this study, EIS(electrochemical Impedance Spectroscopy) was used to confirm the ITZ(Interfacial Transition Zone) between the lightweight aggregate and cement paste according to the coated of blast furnace slag powder. As a result of EIS measurement, the correlation between ITZ characteristics and compressive strength was determined. The phase angle of EIS was different depending on the blast furnace slag powder coated of the lightweight aggregate. The surface-cotead lightweight aggregate was improved and the ITZ was strengthened.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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• pp.132-133
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• 2014

In this study, high volume of industrial by-products including blast furnace slag, recycled aggregate powder and incineration ash have been utilized on the slurry of the foamed lightweight concrete. As to decrease the price of the lightweight foam concrete, mortar based slurry and concrete based slurry has been fixed. As the variation of the foam conduction ratio and aggregates, the foam ratio and compressive strength has been tested. Results showed that using recycled aggregates in the slurry showed better effect than using natural aggregates due to the alkali properties of the recycled aggregates could activate the potential hydraulic properties of the blast furnace slag. Consider about the low price of the recycled aggregates, it could be identified that using recycled aggregates in high volume blast furnace slag blended lightweight concrete showed better compressive strength than natural aggregates.

• KCI Concrete Journal
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• 제11권3호
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• pp.19-28
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• 1999

This study treated self-compacting high Performance concrete as two Phase materials of Paste and aggregates and examined the effect of powder and aggregates on self-compacting high performance, since fluidity and segregation resistance of fresh concrete are changed mainly by paste. To improve the fluidity and self-compactibility of concrete, optimum powder ratio of self-compacting high performance concrete using fly ash and blast-furnace slag as powders were calculated. This study was also designed to provide basic materials for suitable design of mix proportion by evaluating fluidity and compactibility by various volume ratios of fine aggregates, paste, and aggregates. As a result, the more fly ash was replaced, the more confined water ratio was reduced because of higher fluidity. The smallest confined water ratio was determined when 15% blast-furnace slag was replaced. The lowest confined water ratio was acquired when 20% fly ash and 15% blast-furnace slag were replaced together. The optimum fine aggregates ratio with the best compactibility was the fine aggregate ratio with the lowest percentage of void in mixing coarse aggregate and fine aggregate In mixing the high performance concrete. Self-compacting high performance concrete with desirable compactibility required more than minimum of unit volume weight. If the unit volume weight used was less than the minimum, concrete had seriously reduced compactibility.

• 한국건축시공학회지
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• 제24권1호
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• pp.11-21
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• 2024

본 실험에서는 고로슬래그 미분말 치환율에 따른 이산화탄소 양생 모르타르의 기초 물성을 확인하였다. 실험 결과, 이산화탄소 양생은 CaCO₃의 생성을 촉진하며 공극 감소와 조기 강도 발현에 영향을 준다. Ca(OH)₂가 CaCO₃보다 주된 강도 발현에 영향을 주며 고로슬래그 미분말 치환율이 높은 배합일수록 Ca(OH)₂ 생성이 감소한다. 하지만 Ca(OH)₂가 소모된 이후에도 CaCO₃를 통해 강도가 유지되며 이산화탄소 양생 이후 대기 중에 노출하여도 소요의 성능을 유지할 수 있을 것으로 전망된다. 고로슬래그 미분말 치환율이 50%를 초과할 경우 이산화탄소에 의한 성능 저하를 유발하므로 치환 비율을 조정할 필요가 있다.