• Title/Summary/Keyword: 시멘트 킬른 더스트

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Characteristics of Manufacturing for Special Cement Using High Chlorine by-product (고염소 부산물을 이용한 특수시멘트 제조 특성)

  • Moon, Kiyeon;Cho, Jinsang;Choi, Moonkwan;Cho, Kyehong
    • Resources Recycling
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    • v.30 no.6
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    • pp.68-75
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    • 2021
  • This study aims to investigate the manufacturing process of calcium chloride-based special cement, i.e., CCA (calcium chloro aluminate, C11A7·CaCl2), which uses limestone, by using one type of random industrial by-product, domestic coal ash, cement kiln dust. The manufacturing process of was examined in detail, and the results suggested that the amount of CCA synthesized increased with an increase in the firing temperature. The manufacturing process of CCA was investigated at 1200℃, which was determined as the optimum firing temperature. The results showed that in general, the amount of CCA synthesized tended to increase with an increase in the firing time; however, the clinker melted when the firing time was more than 30 min, thereby suggesting that a firing time of less than 20 min would be suitable for the clinkering process. The optimal firing conditions for manufacturing CCA were obtained as follows: heating rate of 10 ℃/min, firing temperature of 1200 ℃, and holding time of 20 min. The results also suggest that manufacturing CCA will be easier when high chlorine-containing cement kiln dust is used.

Production of Concentrated Magnesium Solution from Seawater Using Industrial By-products (산업부산물을 이용한 해수로부터 고농도 마그네슘 용액의 제조)

  • Cho, Taeyeon;Kim, Myoung-Jin
    • Resources Recycling
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    • v.25 no.3
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    • pp.63-73
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    • 2016
  • With the purpose of concentrating the magnesium from seawater, in this study, we have conducted experiments to precipitate the magnesium using three precipitants (NaOH, cement kiln dust, and paper sludge ash), and then extract it using sulfuric acid. Results show that the precipitation and extraction performance does not depend so significantly on the kind of precipitant: for all the precipitants used, the precipitation efficiency is measured almost 100% and the extraction efficiency is in the short range of 77 - 89%. The magnesium concentration in the extract is measured 4975 - 5775 mg/L, implying that the magnesium in seawater should be 3.8 - 4.4 times concentrated through the precipitation and extraction reactions. The reaction efficiency of the industrial by-product used as a precipitant in this study is almost 100% similar to those of the other existing expensive precipitants.

Engineering Properties of Concrete Incorporating Cement Kiln Dust with W/B and Fluidity (W/B 및 유동성 변화에 따른 시멘트 킬른더스트 혼입 콘크리트의 공학적 특성)

  • Joo, Eun-Hi;Shon, Myeong-Soo;Cha, Cheon-Soo;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.628-631
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    • 2004
  • In this paper, mechanical properties of concrete incorporating CKD are discussed with W/B and fluidity. For setting properties, an increase in W/B retarded setting time greatly in $5^{\circ}C$, while accelerated in $20^{\circ}C$. For fluidity, an increase in slump delayed the setting time with dosage of SP agent. The presence of CKD has little influence on setting time compared with plain concrete. For compressive strength, an increase in maturity enhanced compressive strength. Fluidity had no relation to compressive strength. At low curing temperature, concrete with CKD has slight strength loss compared with plain concrete. However, remarkable strength loss at low curing temperature in early stage was not found, which can be applicable to low temperature environment concrete placing.

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A Study on the Properties of Mixture Proportion and Compressive Strength of Concrete with the Kind of Mineral Admixtures (혼화재 종류에 따른 콘크리트의 배합 및 압축강도 특성에 관한 연구)

  • Lee Eun-Hi;Shon Myeong-Soo;Han Min-Cheoi;Cha Cheon-Soo;Kim Seong-Soo;Han Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • v.y2004m10
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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.

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Effect of Curing Temperature on Mechanical Properties of Cement Mortar Using Recycled Aggregate Powder (순환골재미분말 사용 모르터의 역학적 특성에 미치는 양생온도의 영향)

  • Kim, Min-Woo;Feng, Hai-Dong;Park, Kyung-Teak;Baek, Dae-Hyun;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.93-95
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    • 2011
  • This study is to investigate experimentally the engineering characteristics of cement mortar incorporating both recycled aggregate powder (RP) below 0.08 mm and cement kiln dust(CKD). RP is substituted for fine aggregate ranged from 5~15% and CKD is also substituted for RP from 10~30%. The use of RP resulted in a decrease in flow value at fresh mortar, while an increase in CKD did not affect the flow value significantly. The combination of RP and CKD provided slight increase in compressive strength at early and 28 days and in the high curing temperature at early age showed an increasing Strength value.

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Fundamental Properties of Lightweight Foamed Concrete Depending on Admixture Incorporation (혼화재료의 치환에 따른 경량기포 콘크리트의 기초적 특성분석)

  • Choi, Sung-Yong;Shin, Jae-Kyung;Jeong, Kwang-Bok;Han, Min-Cheol;Han, Cheon-Goo
    • Journal of the Korea Institute of Building Construction
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    • v.7 no.2 s.24
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    • pp.77-83
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    • 2007
  • This study investigated the fundamental properties of the lightweight foamed concrete depending on various admixtures, and the results were summarized as following. When 20% of cement kiln dust(CKD) and 0.002% of stabilizing agent were mixed to lightweight foamed concrete, it was necessary to use a superplasticizer because flowability was decreased. However, it could reduce sinking depth which were the extensive trouble of lightweight foamed concrete. Bulk density was divided into '0.4' and '0.5' grades on KS according to unit volume weight. The compressive strength was less than that of plain concrete when admixtures were applied, but the results exceeded the minimum strength of the each grades on KS. Totally, it is found that the combination of 20% of CKD and 0.002% of stabilizing agent makes it possible to reduce a sinking depth, recycle resources, and save cost when were mixed.

Quality Properties of Lightweight Foamed Concrete with Variances in Incorporating Ratio of CKD and Adding Ratio of Stability Agent (CKD 치환율 및 증점안정화제 혼입율 변화에 따른 경량기포 콘크리트의 품질특성)

  • Shin, Hyun-Sub;Yoo, Seung-Yeup;Jeong, Wang-Bok;Pei, Chang-Chun;Kim, Seong-Soo;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.11a
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    • pp.67-70
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    • 2006
  • This study investigates the properties of light weight foamed concrete designed with various incorporating ratios of CKD and adding ratios of PS. Test showed that increase of CKD and PS decreased fluidity of fresh concrete, which need more addition of superplasticizer to secure proper fluidity. As for the sinking depth of specimens, using more CKD or PS decreased the value, due to the improvement of viscosity by micro particles of CKD and reduction of air loss by PS. Those methods are very effective to solve the sinking problem of light weight foamed concrete, which has been highly concerned. For the hardened concrete, compressive strength of specimens exhibited that using around 10% of CKD or 0.02% of PS increased the strength value, but decreased when incorporated or added more amounts of that, due to reduction of the sinking depth, caused by filling effect of the micro particle and improvement of the viscosity.

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Effect of Mineral Admixture Types on the Engineering Properties and the Drying Shrinkage of the Concrete (혼화재 종류가 콘크리트의 공학적 특성 및 건조수축에 미치는 영향)

  • Han, Min-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.9 no.5
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    • pp.119-125
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    • 2009
  • In this paper, the engineering properties and estimation of drying shrinkage of concrete incorporating fly ash (FA), blast furnace slag (BS) and cement kiln dust (CKD) were discussed. FA, BS and CKD contents ranged from 0% to 20%. Water to binder ratio (W/B) also ranged from 40 to 50 %, with a 5% interval. For estimating drying shrinkage, an exponential model proposed by the author was applied, According to results, the use of FA, BS and CKD resulted in a decrease of flowability and air contents. As expected, the use of admixtures also decreases the early age strength of concrete, while at later age, due to a pozzolanic reaction of FA and BS, the compressive strength was recovered to a value comparable with that of plain concrete. For drying shrinkage, the use of admixtures led to an increase in the drying shrinkage of concrete. The exponential model suggested by the author showed good agreement between the calculated and experimental values both at early age and at later age.

A Study on the Quality Properties of Alkali-activated cement free Mortar using Industrial by-products (산업부산물을 사용한 알칼리 활성 무시멘트 모르타르의 품질특성에 관한 연구)

  • Kwon, Yong-Hun;Kwon, Yeong-Ho;Lee, Dong-Gyu
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.1 no.1
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    • pp.58-66
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    • 2013
  • This study investigated quality properties of alkali activated cement free mortar using industrial by-product such as cement kiln dust(CKD), silica fume(SF) and quartz sand powder(SP) to compare with previous research about blast furnace slag(BS) and fly ash(FA). The results were as following. All materials were effective to increase compressive strength, however they showed different tendency on flowability. CKD and SP increased flowability, but on the other hand SF did not because it's blain was great difference with other materials. Flowability and compressive strength were related with grading distributions of binders because CKD, SP and SF which had small particle size filled up BS and FA. Application of industrial by-products with various grading distributions could be effective for the high early strength and flowability of alkali activated cement free mortar using BS.