• 한국농공학회논문집
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• 제51권1호
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• pp.21-26
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• 2009

This study was performed to evaluate the physical and mechanical properties of concrete using waste activated carbon. Materials used were ordinary portlant cement, crushed coarse aggregate, natural fine aggregate, waste activated carbon, and superplasticizer. The substitution ratios of waste activated carbon were 0,1,2,3,4,5,6,7,8,9 and 10%. The unit weight was decreased and water absorption ratio was increased with increasing the waste activated carbon content, respectively. When the substitution ratio of waste activated carbon was 3%, compressive strength, flexural strength and dynamic modulus of elastisity were more higher than that of the ordinary portland cement (OPC), and it was decreased with increasing the waste activated carbon content, respectively. The most effective contents of waste activated carbon was 2% in performance and 4% in practical use Accordingly, waste activated carbon can be used for concrete material.

• 한국건축시공학회지
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• 제12권5호
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• pp.468-477
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• 2012

This study aimed to mix and test mortar incorporating activated Hwangtoh to improve the Hwangtoh brick bond strength of brick structures. To do this, the bond strength correlation of mortar was analyzed by means of materials and experiment factors and levels, and the optimum conditions were suggested after analyzing the physical properties of brick and the mix ratio of mortar and additive. Furthermore, the compressive strength and bond strength were found to be in inverse proportion, and in terms of the materials and mixing level, W/C ratio, substitution ratio of activated Hwangtoh, and fine aggregate grading were shown to have a considerable influence on the strength. In conclusion, the optimum mixing conditions to improve the bond strength are found to set W/C ratio at 65% and replacmenet ratio of activated Hwangtoh at 10%.

• 환경위생공학
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• 제13권2호
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• pp.57-65
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• 1998

In this research, Effect of C/N ratio on nutrient removal in intermittently aerated activated sludge system(IAASS) was investigated with dormitary, building and swine wastewater. Three types (2-stage, 4-stage, modified) of IAASS were operated. Time interval of aeration/nonaeration in IAASS was 1hr/1hr. In treatment of Dormitary wastewater(BOD/T-N ratio : 4.4), Building wastewater (BOD/T-N ratio : 3.14) and swine wastewater(BOD/T-N ratio : 3.84), Nitrogen removal efficiency of 80, 70 and 90.4% was achieved, respectively. Nitrogen removal in IAASS was a great influenced on influent C/N ratio, efficient nitrogen removal was achieved at BOD/T-N ratio over 4. In IAASS operation, $\Delta $BOD mg/L/$\Delta $ nitrogen mg/L ratio was about 4-6. Simultaneous removal of organic, nitrogen and phosphorus in IAASS can achieved. And influent organic was efficiently utilized in denitrification. IAASS could be one of the best alternative process for the retrofit of conventional activated sludge system for the removal of nutrients.

• 한국농공학회논문집
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• 제51권4호
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• pp.21-27
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• 2009

This study was performed to evaluate the physical and mechanical properties of porous concrete using waste activated carbon. Material used were ordinary portland cement, recycled coarse aggregate, waste activated carbon and superplasticizer. The replacement ratios of waste activated carbon were 0,1,2,3,4,5,6,7,8,9, and 10 %. The void ratio was decreased and ultrasonic pulse velocity was increased with increasing the waste activated carbon powder, respectively. The compressive strength and flexural strength of porous concrete using waste activated carbon powder were in the range of 8.21${\sim1}$6.58 MPa and 1.69${\sim1}$3.68 MPa, respectively. The pH degree of porous concrete in 1day and 77days were shown in 12.50${\sim1}$12.63 and 10.21${\sim1}$10.70, respectively. Accordingly, waste activated carbon can be used for porous concrete material.

• 한국연초학회지
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• 제27권1호
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• pp.68-74
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• 2005

Glycerol triacetate(triacetin) is the currently used common plasticizer in the making filters from cellulose acetate tow. For the mono acetate filter, the determination of triacetin contents is already established by CORESTA recommended method (No. 59). But unfortunately, the analytical method of triacetin in the activated carbon filter have not reported so far. In this study, it was established the analytical method of carbon filter's triacetin contents at various extraction conditions, bath ratio and internal standard materials. The confidential level appeared above $95\%$ when the extraction time, ISTD material and bath ratio was 3 hours, tripropionin and below 500 mg activated carbon / 50 $m\ell$ ethanol, respectively. Also, in the distribution of triacetin with filter materials in activated carbon filters, the triacetin amount was the most contained in activated carbon. Therefore, this method can be applied to the determination of triacetin contents in the activated carbon filter.

• Korean Chemical Engineering Research
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• 제49권1호
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• pp.120-127
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• 2011

친환경 복합단열재를 개발하기 위하여 천연섬유질(목재칩 및 톱밥)을 심재로, 활성황토를 결합재로 사용하였다. 물/결합재비 및 천연섬유질/결합재비를 다양하게 변화시켜 공시체를 제작하였으며, 공시체의 제 물성을 조사하기 위하여 압축 및 휨강도, 흡수성, 내열수성, 열전도도, 세공분포측정 및 SEM에 의한 미세조직 관찰을 실시하였다. 그 결과 흡수율은 천연섬유질/결합재비가 증가될수록 증가되었으나 폴리머/결합재비 증가에 따라 현저히 감소되었다. 압축 및 휨강도는 물/결합재비 및 천연섬유질/결합재비에 따라 다양한 특성을 나타내었다. 천연섬유질/결합재비 및 폴리머/결합재비가 증가됨에 따라 열전도도는 감소되었다. SEM조사에서 활성황토 결합재는 수화결정체가 잘 형성되어 치밀한 조직을 관찰할 수 있었고, 활성황토를 결합재로 사용한 시편의 총세공량은 생황토를 결합재로 사용한 시편의 총세공량에 비하여 적게 나타났다.

• 한국건설순환자원학회논문집
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• 제6권2호
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• pp.130-137
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• 2018

건설 산업분야에서는 시멘트를 전혀 사용하지 않고 플라이애쉬 또는 고로 슬래그 미분말을 이용한 알칼리 활성화 시멘트에 대한 연구가 활발히 이루어지고 있다. 본 논문에서는 보통 포틀랜드 시멘트 관리에 사용되는 화학적 정량 분석을 알칼리 활성화 슬래그 시멘트의 화학적 정량분석 결과에 적용하여 알칼리활성화 슬래그 시멘트의 역학적 성능에 미치는 영향을 최소화 하고 최적 화학 조성 허용범위를 검토하고자 하였다. 그 결과 수경율 및 석회포화도의 비율 및 계수는 모두 일정한 범위 내에 있음이 확인되었다.

• 한국구조물진단유지관리공학회 논문집
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• 제11권4호
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• pp.152-158
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• 2007

본 연구는 알칼리 활성시멘트(Alkali Activated Cement)를 콘크리트에 활용하기 위한 기초적인 연구로서 잔골재 및 굵은골재의 혼합비는 일정하게 하고, 활성화제/플라이 애쉬의 혼합비, 그리고 활성화제 중 물유리, 수산화나트륨, 물의 혼합비를 변화시킨 AAC 콘크리트에 대한 압축강도를 측정하였다. 또한 각 변수에 따른 압축강도의 특성을 분석하고, AAC 콘크리트의 최적 혼합비를 구하였다. 그 결과 최대 압축강도 발현을 위한 활성화제 중 물유리, 수산화나트륨, 물의 최적 혼합비는 4.0:1.0:2.5 이었으며, 활성화제/플라이 애쉬의 최적 혼합비는 0.7 이었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제28권6호
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• pp.16-23
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• 2023

Heavy metal (Zinc, Cadmium, Lead) adsorption onto surface modified activated carbon was performed in order to better understand the effect of sodium ion addition to activated carbon. Surface modification methods in this research included water washing, nitric acid washing, and sodium addition after nitric acid washing. These surface modifications generated oxygen functional groups with sodium ions on the surface of the activated carbon.. This caused the change of the specific surface area as well as in the ratio of the carboxyl groups. Heavy metal adsorption onto sodium-containing activated carbon was the most among the three modifications. After the adsorption of heavy metals, the carboxyl group ratio decreased and sodium ions on the surface of the activated carbon were almost non-existent after the adsorption of heavy metals onto sodium-containing activated carbon. The results from this research indicated that ion exchange with sodium ions in carboxyl groups effectively improved heavy metal adsorption rather than electrostatic adsorption and hydrogen ion exchange.

• 한국환경과학회지
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• 제17권8호
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• pp.919-924
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• 2008

The surface properties and adsorption rates of activated carbon modified with acid and base were compared. The distribution ratio of C and C-H on the surface of activated carbon were decreased by modification with acid and base, but the distribution ratio of C-O, C=O, and O=C-O were increased. Base modification damaged the surface of activated carbon more than acid modification, it caused the effect of 6 percent increments of surface area. Adsorption rate model was more suitable to second order equation than first order equation. Adsorption rate was controlled by adsorption in pore better than in surface.