• 한국분말재료학회지
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• 제13권2호
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• pp.102-107
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• 2006

Recycling industrial wastes such as fly ash from a coal burning heat power plant and shell from an oyster farming were investigated to prevent environment contamination as well as to enhance the value of recycling materials. In this study, the lightweight aggregates and the red bricks were fabricated from fly ashes with other inorganic materials and wastes. The starting materials of the lightweight aggregate were fly ash powder and water glass, and the compacts of these materials were heat treated at $1100^{\circ}C$. The fabricated lightweight aggregates had low bulk density, $0.9-1.2\;g/cm^3$, hence floated on the water and had the strength of 7.0-11.0 MPa and the modulus of 2900-3300 MPa which indicates it has enough strength as the aggregate. Another type of the light weight aggregate was prepared from fly ashes, shell powders and clays. The bulk density, porosity, and compressive strength of these aggregates were $1.19-1.34\;g/cm^3,\;18.3{\sim}56.1%$ and 5-12 MPa, respectively. The addition of a small amount of fly ash powder prevented hydration of the light weight aggregates. The red brick was also fabricated from the fly ash containing materials. It is suitable for the brick facing of a building as it has moderate strength and low water absorption rate.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표회 논문집(I)
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• pp.133-138
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• 1998

The purpose of this study is to offer basic information of fly ash concrete for field application. Through before study and fly ash in mortar, various properties as fly ash ratio in concrete were checked according to the experimental result, slump was increased and entrained air quantity was decreased as fly ash ratio is increased in fresh concrete. In hardened concrete, strength development of plain concrete(W/B 50%) was slower than water-reduced concrete(W/B 40%) at early age. Especially water-reduced concrete was remarkabily faster than no fly ash in concrete. Moduls of stastic elasticity and stress-strain relationship of fly ash in concrete nearly were effect on no fly ash concrete.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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• pp.147-152
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• 1999

The purpose of this study is to offer foundmental information of fly ash concrete for field application. Through before study of fly ash concrete, various properties were checked. but when fly ash was added In concrete, entrained air quantity was decreased as fly ash substitution is increased in fresh concrete. so entrained air(below AE) quantity and a kind of AE according to fly ash substitution was tested basic properties. Also water-reducing efficiency was tested. And hydration heat according to fly ash substitution was tested by KR-100. As result of test, according to fly ash substitution increase, entrained air quantity is increase for target entrained air quantity, water-reducing efficiency and hydration heat are positive.

• 한국해양공학회지
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• 제14권3호
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• pp.66-71
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• 2000

The main objectives of this study are to carried out in order to evaluate strength development of Fly Ash concrete containing various amounts of Fly Ash such as 0%, 10%, 20% and 30%. The experimental variables included in this test program consist of content of Fly Ash, concrete strength and chemical activation. As Fly Ash increases, air content, strength development of concrete and slump loss of normal strength concrete were gradually decreased. The inclusion of Na$_2$SO$_4$increased the short-term strength of concrete that contains Fly Ash. In addition, the strength development of concrete that contains Fly Ash and Na$_2$SO$_4$were improved.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.82-87
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• 2001

The purpose of this study is for the active use of the fly ash, which is a by-product of the combustion pulverizes coal thermal power plants, to compensate for the lack of landfill and for conservation of energy, by using fly ash as the supplementary cementitious material, and to prove its possibility as the related products of the cement. First of all, the ordinary fly ash is grinded in a special method and its fineness is controlled from 6000$\textrm{cm}^2$/g to 8000$\textrm{cm}^2$/g, then replaced it with the 10% to 80% of the cement mortar in order to test physics characteristics. The first experiment conducts on the strength development in fly ash replacing content and fineness. and the changes of the flow values, incorporating fly ash into cement. The second one is about the slow development of the strength of the fly ash mortar in early ages, and improves its strength with the activator $Na_{2}SO_{4}$, using high volume fly ash.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.209-210
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• 2019

Current international concerns are the energy crisis due to climate change and depletion of fossil fuels due to global warming. Korea has a very high dependency on energy imports 93%. In Korea, 63% of the country is forested, and a power plant using wood biomass is being built in Korea. Biomass fly ash, a by-product of biomass energy generation, is now being discarded. There is little research to utilize discarded biomass fly ash. Therefore, this study aims to solve the environmental problems, develop new mixed materials, improve the quality and utilize the biomass fly ash, which is a by-product of the industrial waste. As a result of the experiment, the flowability decreased as the replacement ratio of biomass fly ash increased. As the replacement ratio of biomass fly ash decreased, the amount of air content.

• 한국지반공학회지:지반
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• 제14권6호
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• pp.113-125
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• 1998

1997년의 국내 플라이애쉬 발생량은 약 300만톤에 이르고 그 중 약 50만톤이 콘크리트 혼화재료로, 약 30만톤이 시멘트 원료 및 콘크리트 2차제품의 원료로 재활용되었지만 외국에서 재활용율이 높은 지반개량재로는 거의 실적이 없다. 따라서, 본 연구의 목적은 화력발전소의 부산물인 플라이애쉬로 부터 초미분말을 분급하여 부가가치가 큰 초미립자 주입재로 적용할 수 있는지 가능성을 확인하고자 한다. 본 연구를 위해서 블레인 비표면적 6,000$cm^2$/g, 8,000$cm^2$/g의 2수준과, 플라이애쉬 첨가량 30%, 50%, 70%의 3수준 등 총 6가지 조합의 시제품을 만들었으며, 각각에 대해서 시멘트 특성, 주입재 특성을 평가하였다. 시멘트의 물리적 특성, 주입재의 작업시간확보, 주입재 고결체의 내구성 측면에서 분석한 결과, 플라이애쉬계 초미분말 주입재의 플라이애쉬 첨가량의 한계는 50%이하로 하는 것이 요망된다. 또한, 플라이애쉬에 함유되어 있는 미연카본에 의해서 현탁액의 표면에 탄소피막이 형성되고 계면활성제의 소요량이 증가하므로 가급적 미연탄소 함유량이 적은 정제된 플라이애쉬를 사용하는 것이 필요하다. 본 연구를 통해서 화력발전소의 폐기물인 플라이애쉬를 고부가가치 제품인 초미립자주입재로 적용이 가능함을 확인하였으며, 국내의 기술여건에서도 폐기플라이애쉬로 부터 고분말 플라이애쉬를 분급하는 것이 기술적으로 가능하기 때문에 본 연구성과는 현장적용성이 매우 높은 것으로 평가되었다.

• 대한토목학회논문집
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• 제37권2호
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• pp.497-505
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• 2017

TDF (Tire derived fuel) Fly ash는 폐타이어를 발전소의 연료원으로써 사용하고 발생된 분말형태의 산업 부산물이다. TDF Fly ash는 현재까지 국내에서 사업장 폐기물로 분류되어 적절하게 활용되지 못하고 있다. 새로운 활용 방안 모색을 위해 TDF Fly ash를 아스팔트 혼합물용 채움재(Mineral filler)로써 적용하여 사용 가능성을 알아보는 아스팔트 혼합물 기초 물성 시험을 실시하였다. TDF Fly ash는 국내 KS F 3501의 아스팔트 혼합물 채움재 기준을 만족하였으며 마샬 배합설계를 진행하여 4.5%최적아스팔트함량을 결정하였다. 채움재 함량은 3%로 결정하였으며 채움재로써 석분을 사용하여 비교 분석 하였다. 아스팔트 혼합물 기초 물성 시험은 국토교통부에서 발간한 "아스팔트 혼합물 생산 및 시공지침"에서 제시된 규정으로 평가하였다. 시험은 마샬안정도 시험, 동적수침 시험, 인장강도비 시험, 휠 트랙킹 시험을 실시하였다. 실험결과, 마샬안정도와 동적안정도는 국토교통부에서 제시된 기준에 만족하여 안정성을 확인하였고 동적수침과 인장강도비 시험은 TDF Fly ash가 석분보다 박리저항성 및 수분저항성에 효과가 있음을 확인하였다. 따라서 본 연구에서는 TDF Fly ash의 다각적 활용이 예상 되며 긍정적인 효과를 기대할 수 있을 것으로 판단된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.549-554
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• 2000

Generally, it is indicated that concrete using fly ash as a part of cement content has lower early strength, and faster carbonation velocity. To improve these problems and provide useful information for high volume fly ash concrete, the properties of concrete - those include slump, bleeding, setting time, compressive strength and carbonation depth etc. - which contained large amount of fly ash as a part of fine aggregate were investigated experimentally. According to test results, it was found that the compressive strength of the concrete increased in early age as well as in long term age with the increase of the fly ash content. And the carbonation depth of concrete using fly ash as a part of fine aggregate was lower than that of plain concrete(FA 0kg/ $\textrm{m}^3$).

• 한국세라믹학회지
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• 제39권2호
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• pp.135-144
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• 2002

채취 그대로의 fly ash(As Received Fly Ash, ARFA)90 wt%와 cement 10 wt%의 혼합물 ball milling 함으로서 mechanochemical processing에 의해 표면 처리한 fly ash(Mechanochemically Surface Treated Fly Ash, MSTFA)를 사용하여 fly ash 혼화 concrete의 강도 증진을 위한 연구를 수행하였다. ARFA에 ball-milling하여 particle size reduction만 발생시킨 fly ash(Ball-mill Processed Fly Ash, BPFA)혼화시의 공시체와 비교하여 동일한 fly ash의 혼화량, 동일한 재령의 압축강도 및 미세구조의 관점에서 고찰하였다. MSTFA를 혼화한 concrete 공시체의 압축강도는 ARFA를 혼화한 것보다 10-20%, BPFA를 혼화한 것보다는 2-7 wt% 상승한 값을 나타내었다. 이 같은 강도 상승은 MSTFA와 cement의 각 입자의 서로에 대한 친화성이 증대되며 이로 인하여 수화물 생성시 cement와 fly ash 입자간의 결합력이 더욱 증가하게 되어 압축강도가 증가하는 것으로 고려된다.