• 한국건축시공학회지
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• 제18권6호
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• pp.507-515
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• 2018

본 연구의 목표는 숏크리트 타설시의 분진 발생 문제, 낮은 알칼리도의 유지를 통한 환경부하 감소 및 시멘트 광물계가 가지는 빠른 초기강도 발현의 특성을 동시에 가지는 슬러리형 급결제를 개발하고, 이를 활용하여 고성능 내염해성 숏크리트의 현장 타설에 적용하는 것이다. 본 연구에서는 물결합재비 0.44 및 0.338의 두 종류의 숏크리트 배합에 대하여 슬러리형 급결제를 현장 적용시켰으며, 현장에서 얻은 숏크리트 및 숏크리트용 베이스 콘크리트 시험체의 강도 및 내염해성을 비교 분석하였다. 실험 결과에 따르면, 슬러리형 급결제는 두 종류의 숏크리트 배합에 모두 성공적으로 적용 되었으며, 이를 이용하면 1일 강도 10MPa 28일 강도 40MPa급의 고성능 숏크리트의 제조가 가능한 것을 확인하였다. 물결합재 0.338의 숏크리트 배합에서, 고로슬래그 미분말의 활용시 1일강도는 물결합재비 0.44의 숏크리트 배합보다 다소 낮게 나타났으나, 28일 재령에서의 강도가 현저히 역전되었으며, 염해저항성이 크게 개선되는 것을 확인하여, 고로슬래그 미분말이 고성능 내염해성 숏크리트의 개발에 성공적으로 활용될 수 있음을 확인하였다.

• 자원리싸이클링
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• 제20권1호
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• pp.3-13
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• 2011

대만의 제강생산량은 21,290천톤이고, 전기로제강량은 제강생산량의 약 반, 즉 11,200천톤이다. 그리고 이 전기로 제강시 발생되는 더스트량은 160천톤(2009년도)이다. Walcz 프로세스(탄소강 EAF 더스트)에서 약 70천톤, RHF/SAF 프로세스(스테인레스강 EAF 더스트)에서 약 60천톤을 처리하고 있다. 그리고 약 90천톤/년의 조산화아연(ZnO)이 생산되고 있는 것으로 추정된다. 현재 새로운 EAF 더스트 리싸이클링법이 개발되고 있고, 조산화아연의 품위향상이 앞으로 과제이다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.483-490
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• 2005

At present around 50 companies have their own crushing plants, which manufacture rock into crushed sand, over around 350 different quarry throughout the nation. However, in most plants the stone dust sludge is left as it is in their plants so that they have difficulty to utilize. Furthermore, environmental pollution may be even caused due to dust generated when it is dried. Recycling is starting capturing the attention of the people working over the quarry due to the reasons described above. This research has studied in the quarters the usability as landfill liner of the stone dust sludge, which is industrial waste. We investigated what technological properties it would have after mixing the stone dust sludge with SM(sandy soil) first and then with blast furnace slag or reject ash, which is waste, and cement as the stabilizer. As the result of three tests; compacting test, strength test, and permeability test; to satisfy the regulatory guideline of the government that is the compress strength over 5 $kgf/cm^2$, the flexibility over 1 $kgf/cm^2$, and the permeability under $1.0{\times}10^{-7}cm/sec$ From this research, we could confirm that stone dust sludge would be used as waste landfill liner if it were mixed with other waste by the proper mixing ratio.

• 한국건설순환자원학회논문집
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• 제8권2호
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• pp.235-244
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• 2020

본 연구는 시멘트 제조 시 발생하는 CBS-dust의 새로운 활용방법을 모색하고자 일련의 연구를 진행하는데, CBS-dust의 공학적 특성 결과를 요약하면 다음과 같다. 먼저, 굳지 않은 모르타르의 경우 CBS-dust 치환율이 증가할수록 플로는 감소하였으나, 결합재 조성비 BS 45% 및 65%의 경우는 CBS-dust 5% 치환 시 Plain보다 높은 유동성을 발휘하는 것으로 나타났다. 공기량의 경우는 전반적으로 CBS-dust 치환율과 비례적인 경향을 나타내며, 염화물은 CBS-dust 치환하지 않은 경우를 제외하고 모든 치환율에서 기준치를 상회하는 경향을 보였다. 경화모르타르의 압축강도는 전반적으로 CBS-dust를 5%~10% 내외 치환시 강도가 증진되는 결과를 보이며, 미세구조분석을 통하여 CBS-dust 치환시 수화반응이 촉진되어 C-S-H gel 생성 및 구조형성을 확인할 수 있었다. 따라서, CBS-dust를 철근이 없는 혼화재를 다량 사용하는 콘크리트 2차 제품에서 조강성 혼화재로 사용한다면, 알칼리 자극제로 콘크리트의 강도증진 등에 효과적인 활용법이 될 수 있을 것으로 판단된다.

• 한국건축시공학회지
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• 제7권1호
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• pp.71-77
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• 2007

This paper is to investigate the effect of the curing temperature on strength development of concrete incorporating cement kiln dust(CKD) and blast furnace slag (BS) quantitatively. Estimation of the compressive strength of the concrete was conducted using the equivalent age equation and the rate constant model proposed by Carino. Correction of Carino model was studied to secure the accuracy of strength development estimation by introducing correction factors regarding rate constant and age. An increasing curing temperature results in an increase in strength at early age, but with the elapse of age, strength development at high curing temperature decreases compared with that at low curing temperature. Especially, the use of BS has a remarkable strength development at early age and even at later age, high strength is maintained due to accelerated pozzolanic activity resulting from high temperature. Whereas, at low curing temperature, the use of BS leads to a decrease in compressive strength. Accordingly, much attention should be paid to prevent strength loss at low temperature. Based on the strength development estimation using equivalent age equation, good agreements between measured strength and calculated strength are obtained.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 추계 학술논문 발표대회
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• pp.75-78
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• 2005

This raper investigates the effect of curing temperature on strength development of concrete incorporating cement kiln dust(CKD) and blast furnace slag (BS) quantitatively. Estimation of compressive strength of concrete was conducted using equivalent age equation and rate constant model. An increasing curing temperature results in an increase in strength at early age, but with the elapse of age, strength development at high curing temperature decreases compared with that at low curing temperature. Especially, the use of 35 has a remarkable strength development at early age and even at later age, high strength is maintained due to accelerated pozzolanic activity resulting from high temperature. Whereas, at low curing temperature, the use of BS leads to a decrease in compressive strength. Accordingly, much attention should be paid to prevent strength loss at low temperature. Based on the strength development estimation using equivalent age equation, good agreements between measured strength and calculated strength are obtained.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2004년도 학술대회지
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• pp.51-54
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• 2004

This paper investigated the results of mixture proportion and compressive strength of concrete incorporating mineral admixtures. W/B and contents of mineral admixtures were selected as test parameters. According to test results, use of mineral admixtures resulted in a reduction of fluidity and air contents caused by increased fine particles and absorption effect of FA on reduction of AE agent. Thus, increase of SP and AE agent was needed to maintain the same fluidity and air content as plain concrete. At early stage, use of CKD was beneficial to the compressive strength while at 28days. incorporation of FA and BS had favorable effect on the compressive strength.

• 폴리머
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• 제38권5호
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• pp.664-670
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• 2014

The effects of different filling materials and stabilizers in polymer based materials that are used as shoe soles in the shoemaking industry on the mechanical properties (strength, failure, tensile, tearing, bending etc.) of the final products have been examined in this study. Natural rubber (NR RSS3) and styrene-butadiene rubber (SBR 1502) were used as the main matrix material. New compounds were formed by replacing the fillings in the general compound of the existing factory ($SiO_2$, $CaCO_3$) with 40% (1200 g) blast furnace flue dust, rice husk, reclaimed rubber (recycled) and wood ash. Comparison of the new compounds with the existing compounds revealed a decrease in hardness, density, dimension stability, bending, tearing, % elongation and failure strength and an increase in wearing.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
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• pp.253-256
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• 2005

This paper is to investigate the mixture proportion, compressive strength and drying. shrinkage of concrete depending on mineral admixtures such as fly ash (FA), blast furnace slag (BS) and cement kiln dust (CKD) under various contents of admixtures. The use of CKD had little effect on strength development at 3 days, while the use of FA and BS lead to similar compressive strength compared with that of control concrete. Concrete with CKD exhibited a reduction of compressive strength at 91 days, meanwhile concrete with FA and BS had a increase compared with that of control concrete. Drying shrinkage of concrete depending on CKD and BS increase compared with that of control concrete about $10\∼20\%$, while the use of FA exhibited reduce compared with that of control concrete about $10\∼15\%$.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 가을 학술논문 발표대회
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• pp.55-56
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• 2022

As global warming becomes serious, research is continuously being conducted to reduce CO2 emissions. Among building materials, the carbon emission of cement is so high that it accounts for 6.8% of the carbon emission of the entire industry. Studies replacement of cement with blast furnace slag and fly ash are steadily increasing. In addition, efforts are being made to reduce air pollution due to increased damage caused by increased concentrations of harmful substances such as fine dust and heavy metals in the air. There is an increasing number of studies that enable adsorption by mixing adsorbents into building materials. This study reviewed the strength properties to make an adsorbable non-cement finishing material by mixing tourmaline, an adsorbent, based on the non-cement composite, and confirmed that the strength decreases as the replacement ratio increases.