• 대한건축학회논문집:구조계
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• 제35권10호
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• pp.199-206
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• 2019

This study aims to recycle redmud which is a byproduct in the alumina industry. Redmud ceramics were prepared according to the type of raw materials by blending redmud with the raw materials used in the conventional clay bricks. In this paper, the compressive strength, water absorption ratio, and shrinkage of redmud ceramics prepared by mixing clay bricks were evaluated. Compressive strength and absorption ratio of redmud ceramics were compared with the clay brick criteria of KS L 4201. At the firing temperature of $1200^{\circ}C$, the specimens containing redmud only and the redmud with sandy loam and black clay were found to satisfy the 1st class of clay brick. The quality standard of compressive strength and absorption ratio was obtained by firing redmud with black clay and sandy loam at $1200^{\circ}C$. Also, when the redmud was mixed with black clay and feldspar, the 2nd class was satisfied when the sample was fired at $1100^{\circ}C$.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.21-22
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• 2019

This study is designed to apply natural clay replaceable redmud as ceramic material by mixing redmud with the materials used in existing brickmaking in laboratory environment. Therefore, through this study, the redmud is recycled as a raw material for clay bricks and presented as a basic material for the use of redmud in clay bricks.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.70-71
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• 2019

Interest in indoor air quality is increasing day by day due to various reasons such as industrial development. Because redmud, an industrial subsidiary, contains titanium dioxide, this study evaluated self-consolidation performance with Slump Flow Test, J-Ring Test, and L-Box Test by mixing redmud in a mixture of ultra-high performance concrete, and sought the optimal combination with high flowability. In addition, the UHPC mixing experiment with photocatalyst was conducted, and the photocatalyst was replaced by the weight ratio of cement and the redmud by the weight ratio of fine aggregate and mixed with the concrete mixture.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.585-588
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• 2008

This study investigated fundamental properties of the colored concrete Corresponding to the various temperatures for plasticity and additive volume of the redmud. the results were summarized as following. There was no difference on the air contents and slumpflow at each temperatures for plasticity. The color tone was high in accordance with increase of temperatures for plasticity, but the drying shrinkage length change was shown in the opposite tendency. The slumpflow was gradually declined, but the air content, compressive strength, color ton and drying shrinkage length change were overall increased when the additive volume of the redmud was increased.

• 대한환경공학회지
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• 제34권12호
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• pp.787-791
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• 2012

실험실 규모의 음향정재파 장치를 이용하여 수체에 포함된 입자의 분리특성을 알아보았다. 음향정재파는 음파 또는 초음파와 유사한 파장으로 반사벽에 의해 발생된 파가 돌아오면서 일정한 파장을 형성한다. 이때 수중에 분산되어 있던 미세한 입자들은 음압이 0인 파장의 절점(node) 부분에 모이게 된다. 주파수 28.0 kHz와 1.0 MHz의 음향정재파 트랜스듀서를 이용하였고, 수체에 포함된 입자는 평균 입경 $6.8{\mu}m$의 카올린과 $100.5{\mu}m$의 레드머드를 사용하였다. 수체 내에 음향정재파가 형성되면 발생된 파장에 의한 음압으로 수온이 $0.15{\sim}0.20^{\circ}C/min $ 정도 상승된다. 카올린과 레드머드의 초기 농도는 0.1, 0.2, 0.3, 0.4, 0.5 g/L로 동일하게 제조하였다. 1.0 MHz의 주파수에서 5분경과 후 음향정재파가 가장 뚜렷하게 형성되었을 때의 반응조내의 탁도 제거율은 카올린은 18.2%~56.2%로, 입경이 큰 레드머드는 23.0%~53.6%의 분리효율을 나타내었다. 28.0 kHz 주파수에서는 입자분리가 이루어지지 않았다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.96-97
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• 2015

In this search, by evaluating the field applicability of soil mixed pavement of Red mud is mixed into the soil mixed pavement field applicability, and tries to present the basic data about the site application of recycling of red mud and low carbon construction material to. As a result, the conventional soil concrete organization standards (SPS-KSCICO-001: 2003) meets the criteria for a bicycle road, making use of red mud, natural color as well as the natural loess is expressed.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.104-105
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• 2020

Red mud is a highly alkaline waste by-product of the aluminum industry. Although recycling of red mud is being actively researched, a feasible technological solution has not been found yet. In this study, we propose that neutralization of red mud alkalinity could assist in its use as a construction material. Neutralized red mud ( pH 6-8) was prepared by adding sulfuric acid to liquefied red mud (pH 10-12). After adding liquid and neutralized red mud to the cement paste, the heat of hydration was measured. As a result of the experiment, the calorific value of the cement paste with liquid red mud was lowered and delayed compared to the cement paste with neutralized red mud.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.70-71
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• 2021

An increasing amount of red mud (RM) is being generated globally with the growth in alumi-num production. To avoid the RM becoming a pollutant, methods for effectively recycling RM at a low cost are being investigated. This study proposes a method for recycling RM as a construc-tion material. The cement paste with neutralized liquefied red mud had higher compressive strength than that of plain cement paste and cement paste with liquefied red mud without neutralization at 1 d of aging; this indicates that nitric acid neu-tralization increases the early-age strength.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.139-140
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• 2023

In this study, red mud with low recyclability was manufactured as liquid red mud, neutralized with sulfuric acid and nitric acid, and then added to cement paste to conduct research on physical and chemical properties. As a result, liquid red mud-added cement paste neutralized with sulfuric acid and nitric acid showed higher compressive strength after one day than cement paste with plain and non-neutralized liquid red mud. This indicates that nitric acid and sulfuric acid neutralization can increase initial strength.

• 한국건설순환자원학회논문집
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• 제5권1호
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• pp.37-44
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• 2017

레드머드는 보오크사이트 원광석에서 생산되는 알루미나의 선광과정에서 발생되는 무기질 부산물이다. 레드머드를 활용하고자하는 연구가 국내에서 이루어지고 있다. 강알칼리성의 레드머드를 건설산업용 촉진제로서 활용하고자 하는 연구로서 알칼리활성화 슬래그-레드머드 시멘트가 국내외적으로 발표되고 있다. 본 논문은 레드머드 대체율에 따른 알칼리활성화 슬래그-레드머드 건식 흙포장재의 최적함수율, 압축강도, 흡수율, 백화발생 특성에 대하여 비교 검토하였다. 그 결과 레드머드 대체율이 증가할수록 알칼리활성화 슬래그-레드머드 흙포장재의 최적 함수비, 흡수율, 백화면적은 증가하고 압축강도는 감소하였다.