• Title/Summary/Keyword: coal waste

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Manufacture and Properties of Coal Fly Ash-Clay Body (석탄회-점토계 소지의 제조 및 물성)

  • 송종택;윤성대;류동우;한경섭
    • Journal of the Korean Ceramic Society
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    • v.33 no.7
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    • pp.771-778
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    • 1996
  • Utilization of fly ash by-produced from coal fired power plants and classified as general waste became very important problem to solve in the environmental protection and recycling of waste materials. The possibility of large scale substitution of fly ash as a raw material for bricks and wet tiles was highly expected because the chemical compositions of fly ash were mostly Al2O3 and SiO2 and the properties of it were very similar with clay. Accordingly in order to investigate the substitutional limit these specimens were substituted from 0 to 100 wt% fly ash by 20wt% increment for clay. Fly ash-clay bodies were fired at 1200, 1250 and 130$0^{\circ}C$ and then their properties were measured, It was found that these specimens sintered at 125$0^{\circ}C$ had a good bending strength. Especially when these sintered bodies were added to 20, 40 and 60 wt% fly ash the bending strength of those were 201 , 205 and 191kg.cm2 respectively with the water absorption below 1%, This showed that fly ash could be substituted ab 60 wt% in this experiment.

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Utilization Potential of Industrial waste Landfills as Construction Sites (산업폐기물 매립지의 건설부지로의 활용성)

  • 장연수;조삼덕
    • Proceedings of the Korean Geotechical Society Conference
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    • 1992.10a
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    • pp.69-74
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    • 1992
  • The characteristics of the landfill of coal ash and ironwork wastes are investied by performing the basic geotechnical experiments and groundwater quality analyses in the landfills. The results show that the waste materials themselves have good characteristics that can be used as reclamation materials. However, landfills need either some ground improvement or costly foundation and excavation methods to be used as construction sites, because of the careless management during the period of waste disposal.

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Characteristic studies of coal power plants ash sample and monitoring of PM 2.5

  • Thriveni., T;Ramakrishna., CH;Nam, Seong Young;kim, Chunsik;Ahn, Ji Whan
    • Journal of Energy Engineering
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    • v.26 no.4
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    • pp.45-56
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    • 2017
  • Coal power plants produce electricity for the nation's power grid, but they also produce more hazardous air emissions than any other industrial pollution sources. The quantity is staggering, over 386,000 tons of 84 separate hazardous air pollutants spew from over 400 plants in 46 states. In South Korea also, annual coal ash generation from coal-fired power plants were about 6 million tons in 2015. Pollutants containing particulate matter 10, 2.5 (PM10, PM2.5), heavy metals and dioxins from coal-fired power plant. The emissions threaten the health of people who live near these power plants, as well as those who live hundreds of miles away. These pollutants that have long-term impacts on the environment because they accumulate in soil, water and animals. The present study is to investigate the physical and chemical characteristics of coal-fired power plant fly ash and bottom ash contains particulate matter, whose particulate sizes are lower than $PM_{10}$ and $PM_{2.5}$ and heavy metals. There are wide commercial technologies were available for monitoring the PM 2.5 and ultra-fine particles, among those carbonation technology is a good tool for stabilizing the alkaline waste materials. We collected the coal ash samples from different coal power plants and the chemical composition of coal fly ash was characterized by XRF. In the present laboratory research approach reveals that potential application of carbonation technology for particulate matter $PM_{10}$, $PM_{2.5}$ and stabilization of heavy metals. The significance of this emerging carbonation technology was improving the chemical and physical properties of fly ash and bottom ash samples can facilitate wide re use in construction applications.

Development of lightweight Fly ash-Plastic Aggregate (석탄회 및 폐플라스틱을 이용한 인공경량합성골재의 개발)

  • Jo Byung Wan;Park Seung Kook;Park Jong Bin;Jansen Daniel C.
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.380-383
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    • 2004
  • The coarse and fine aggregates that make up the majority of concrete are resources. But, the raw naturals that make up concrete are our earth's resources and there is not a replenishable stock. Also industrial waste and life waste leaped into a pollution source. Therefore, as construction continue, quarries are exhausted and new sources must be discovered. The purpose of this paper is to investigate an application of recycled coal ash plastics in the construction field. The study examined the physical and mechanical properties of recycled coal ash plastics aggregate. In the results, although the absorption and specific gravity of SLAs increases slightly as the fly ash content increases, the compressive strength and modulus of elastic of concrete made with SLAs remains relatively constant when mortar type and volume fraction are also held constant. These values are always lower than natural-weight aggregate concretes.

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Evaluation for Characteristics of Coal-mine Waste Concrete (석탄폐석을 이용한 콘크리트의 특성 연구)

  • 김광우;도영수;이상범
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.43 no.2
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    • pp.132-139
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    • 2001
  • This study deals with coal-mine waste (CMW) for use in concrete as a replacement of normal aggregates. The CMW was collected from Sabuk region. Ganwon-do. Fine and coarse aggregates from CMW were prepared by using a crusher and separating debris with #4 sieve. CMW aggregates showed good physical and mechanical properties with having specific gravity over 2.65, absorption less than 1%, and abrasion ratio below 20%. However, particle shape of CMW was poor because of non-isotropic nature of matrix which cause particles to be long or flat. Since irregular particles caused a poor workability, to make workability better, a 1/4 of coarse aggregate was replaced with normal aggregate together with a superplasticizer. Compressive strength and other mechanical properties of CMW concrete were very good. Color of the concrete was darker than normal concrete due to black color of CMW. In conclusion, characteristics of CMW concrete was acceptable for use as a structural concrete material.

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Experimental Study for Early Properties of Waste Recycling Shotcrete with a Combination of Coal-Ash (동해.영동화력발전소 석탄회 대체를 통한 폐기물 재활용 숏크리트의 내구성 특성 연구)

  • Choi, Hyun-Kyu;Jung, Woo-Young;Lee, Sang-Moon;Kim, Sung-Hoon;Hwang, Jin-Seob;An, Mi-Kyung
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.391-392
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    • 2009
  • This research presents early characters of waste recycling shotcerete with a combination of Coal-Ash are used by Yong-Dong thermoelectric power plant and Dong-Hae thermoelectric power plant. Several tests were conducted in this research.

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Utilization of Waste and Industrial Byproducts as a Raw Material in the Manufacture of Portland Cement (시멘트 원료로서 폐.부산자원의 활용)

  • 최상흘;박용완;지정식;오희갑
    • Journal of the Korean Ceramic Society
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    • v.15 no.3
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    • pp.149-156
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    • 1978
  • The utilization of waste and industrial byproduct materials, such as blast furnace slag, shales, poor coal and anthracite briquet ash, were investigated as a source of calcareous or argillaceous material in the manufacture of Portland cement. As a slag is similar to cement in chemical compoment and contains about 40∼50% of CaO, it's utilization in cement manufacture should be suitable. The burnability was increased and the heat of clinker formation was decreased by using slag. Some consideration should betaken in the use of large quantity because of sticking in suspension preheater kiln. Suitable quantities of colliery shales and poor coal should be useable in cement manufacture as a argillaceous materials and also its combustible materials should be utilized in cement manufacture. Anthracite briquet ash is also usable as a argillaceous source and it gives good burnability.

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Mechanical Behavior of Coal Mine Waste Concretes (석탄폐석을 이용한 콘크리트의 역학적 거동)

  • Lee, Bong-Hak
    • Journal of Industrial Technology
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    • v.16
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    • pp.105-112
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    • 1996
  • This paper presents coal mine waste (CMW) for use in concrete manufacture as a replacement of normal aggregates. The CMW in this study was collected from Sabook, Jungson-kun, Kangwon-do. Fine and coarse asggregates from CMW were prepared by crushing it in a jaw crusher and separating debris with #4 sieve. CMW aggregates showed good physical and mechanical properties with having specific gravity over 2.65, absorption less than 1%, and abration ratio below 20%, but particle shape of CMW was long or flat, which caused a poor workability in mixing. Therefore, to make workability better, a 1/4 of CMW coarse aggregate was replaced with normal aggregate which had a good particle shape, and a superplasticizer was added to the mix. Compressive strength and other mechanical properties of CMW concrete was very good. In conclusion, characteristics of CMW concrete was acceptable for use as a concrete structural material.

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Observation of Volume Change and Subsidence at a Coal Waste Dump in Jangseong-dong, Taebaek-si, Gangwon-do by Using Digital Elevation Models and PSInSAR Technique (수치표고모델 및 PSInSAR 기법을 이용한 강원도 태백시 장성동 폐석적치장의 적치량과 침하관측)

  • Choi, Euncheol;Moon, Jihyun;Kang, Taemin;Lee, Hoonyol
    • Korean Journal of Remote Sensing
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    • v.38 no.6_1
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    • pp.1371-1383
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    • 2022
  • In this study, the amount of coal waste dump was calculated using six Digital Elevation Models (DEMs) produced between 2006 and 2018 in Jangseong-dong, Taebaek-si, Gangwon-do, and the subsidence was observed by applying the Persistent Scatterer Interferometric SAR (PSInSAR) technique on the Sentinel-1 SAR images. As a result of depositing activities using DEMs, a total of 1,668,980 m3 of coal waste was deposited over a period of about 12 years from 2006 to 2018. The observed subsidence rate from PSInSAR was -32.3 mm/yr and -40.2 mm/yr from the ascending and descending orbits, respectively. As the thickness of the waste pile increased, the rate of subsidence increased, and the more recent the completion of the deposit, the faster the subsidence tended to occur. The subsidence rates from the ascending and descending orbits were converted to vertical and horizontal east-west components, and 22 random reference points were set to compare the subsidence rate, the waste rock thickness, and the time of depositing completion. As a result, the subsidence rate of the reference point tended to increase as the thickness of the waste became thicker, similar to the PSInSAR results in relation to the waste thickness. On the other hand, there was no clear correlation between the completion time of the deposits and the rate Of subsidence at the reference points. This is because the time of completion of the deposits at all but 5 of the 22 reference points was too biased in 2010 and the correlation analysis was meaningless. As in this study, the use of DEM and PSInSAR is expected to be an effective alternative to compensate for the lack of field data in the safety management of coal waste deposits.

Strength Development and Drying Shrinkage in Recycled Coal-Ash Building Material (석탄회를 재활용한 건설소재의 강도발현 및 건조수축)

  • Jo, Byung-Wan;Kim, Young-Jin;Park, Jong-Bin
    • Journal of the Korea Concrete Institute
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    • v.15 no.5
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    • pp.670-678
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    • 2003
  • Recently, since industrial waste and life waste leaped into a pollution source, the building material used now a days is striking the limit. The purpose of this paper is to investigate an application of recycled coal ash using non-sintering method in the construction field. Accordingly, compressive strength, elastic modulus and drying shrinkage were experimentally studied for hardened coal ash using the non-sintering method. Also, Lineweaver and Burk method were applied to the regression analysis of drying shrinkage for the proposal equation. Elastic modulus, compressive strength of material become the basis properties of structural design. And these properties by age for hardened coal ash are important because of change by pozzolan reaction. This hardened coal ash is weak for tensile stress like that of concrete. And drying shrinkage is very important factor to make huge tensile force in early age. In the results, although some differences were shown when comparing coal ash with mortar or concrete, the application as a building material turned out to be possible if further researches were carried out. And the shrinkage characteristic of hardened coal-ash reveals to be similar to that of moderate heat cement.