• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표회 논문집(I)
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• pp.151-156
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• 1998

Concrete structures is appeared the shrinkage after being harden of the hydration effect of cement. To overcome this disadvantage, expansive additives are used. In our country, the most popular expansive additives are hauyne(CSA) or free lime(free-CaO) systems. These expansive additives are used to expansive cement mortar or concrete materials. In this study, we analyzed the expansive property mechanism about the hydration reaction of the free lime systems and in particular we convinced size distributions of the free lime size affect the expansion ratio with expansion ratio with experiments. We carried out the experiment for the expansive properties by using the soundness molds and with various the humidity and dry setting conditions. The hydration reactions of the free lime affect the reaction properties according to the relative humidity by laboratory experiments.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.373-376
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• 2008

New glass compositions for lead free, low temperature sealing glass frit was examined in $ZnO-V_2O_5-P_2O_5$ glass system which can be used sealing material for PDP to be made of soda lime glass substrates. Among many glass compositions, KFS-C glass showed low glass transition point (Tg) and good fluidity and adhesion characteristics when it was tested by flow button method at low temperature of $420^{\circ}C$. Its Tg was $317^{\circ}C$ and thermal expansion coefficient (CTE) was $70{\times}10^{-7}/K$. The glass frit was mixed with an organic vehicle to make a paste and it was dispensed and sealed with soda lime glass substrates at $420^{\circ}C$ for 10min. Sealed glass panels also showed good adhesion strength even sealed at low temperature of $420^{\circ}C$.

• 시멘트 심포지엄
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• 21호
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• pp.98-101
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• 1993

• 시멘트 심포지엄
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• 29호
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• pp.245-252
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• 2002

소성 영역(Sintering zone)에서 클링커(Clinker)의 형상 형성은 시멘트 생산 공정에서 가장 중요한 생산 공정중의 하나이다. 소성공정의 진단 및 최적 제어의 핵심은 써모그래프(Thermo graph), 즉 적외선 카메라를 이용한 온도 분포의 측정이다. 여기에서 다룰 ''PIT Indicator'' 시스템은 분진이 많은 열악한 산업 현장의 연소 시스템에 적용할 수 있도록 특별히 설계한 공냉식의 2개 채널을 가진 광학 장비에 기초하고 있다. 비디오 영상과 써모그래프 이미지 그리고 다양한 연소 특성이 카메라를 통하여 얻어지고 자기 학습 기능을 가진 소프트웨어에서 기록되고 분석된다. 이때 얻은 데이터는 수학적 모델에서 온라인으로 Free Lime 함유율을 예측하는데 이용된다. 열분포의 써모그래프 표시와 공정상의 다양한 운전 특성을 분석하여 주는 ''PIT Indicator'' 소프트웨어를 통하여 다른 공정 제어 시스템과 연결이 가능하다. 이와 같은 하드웨어와 소프트웨어를 이용하여 최적화가 필요한 여러요소들의 최적화를 동시에 그리고 온라인으로 수행할 수가 있다. Free Lime 함유율의 연속적인 온라인 연산을 통해 생산 설비 및 공정에 맞는 최소한의 에너지를 Kiln 에 공급함으로써 근본적으로 1차 연료의 절감이 가능하고 NOx와 같은 유해 가스의 배출량도 제어할 수 있다. 또한 별도로 NOx에 대한 모델을 개발하여 NOx를 정확하게 예측하는 것도 가능하다.

• 한국전기전자재료학회논문지
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• 제21권8호
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• pp.755-759
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• 2008

For the development of a new white dielectric layer in plasma display panel, different $TiO_2$ types as a filler was add to the $Bi_2O_3$-BaO-ZnO glass matrix. The reflectance and dielectric constant of dielectric have been investigated as a function of the mixing content (rutile and anatase), and sintering temperature. The reflectance of dielectric sintered at the 520$^{\circ}C$ appeared most highly and suitable in terms of the adhesion and reflectance of the soda-lime glasses. Also, the thermal expansion coefficient of dielectric was found to be $85.6\times10^{-7}/K$, which was similar to that of the soda-lime glasses. Especially, the dielectric constants were not increased with increasing of $TiO_2$ filler contents.

• 한국세라믹학회지
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• 제19권1호
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• pp.19-23
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• 1982

The technique to determine the components in the supersulphated slag cement is discussed by several selective extraction analyses. Accordingly, the rate of hydration reaction of supersulphated slag cement could be quantitatively measured by the following 3 kinds of the selective extraction analyses. (1) Determination of unreacted slag - a salicylic acid, acetone.methanol solution (2) Determination of free $CaSO_4$ - a half saturated lime water (3) Determination of free $Ca(OH)_2$ - glycerine.alcohol solution

• 한국토양비료학회지
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• 제24권3호
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• pp.210-218
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• 1991

질소무시용하(窒素無施用下)에서 소석회(消石灰), 고토석회(苦土石灰), 탄산석회(炭酸石灰)는 중화량(中和量), 황산석회(黃酸石灰)는 10a당(糖) 150kg시용(施用)하고 비닐피복후(被覆後) $40{\times}25cm$ 재식거리(栽植距離)로 1989년(年) 4월(月) 26일(日) 파종(播種)하여 호남(湖南) 작시(作試) 선발(選拔) 우량질소(優良窒素) 고정균(固定菌)(B. sp HCR-46)을 종자(種字) 1입당(粒當) $8.2{\times}10^7$ cell의 농도(濃度)로 접종(接種)한뒤 영호(嶺湖)땅콩의 종실성분(種實成分)의 변화(變化)를 조사(調査)한 결과(結果)는 다음과 같다. 1. 땅콩에 착생(着生)한 근류수, 근류건중(根瘤乾重) 그리고 지하부건중(地下部乾重)은 근류균(根瘤菌) 접종(接種)으로 증가(增加)되었으며, 석회비종별(石灰肥種別)로는 탄산석회(炭酸石灰)>고토석회(苦土石灰)>소석회(消石灰)>무시용(無施用)>황산석회순(黃酸石灰順)이었다. 2. 근류균(根瘤菌) 접종(接種)으로 잎과 줄기중(中) T-N, $K_2O$, MgO, Allantoin, Ammonia, 유리(遊離)아미노산함량(酸含量), 엽록소함량(葉綠素含量)은 증가(增加)되었으나 Nitrate 와 줄기중(中) 전당(全糖), 전분(澱粉)의 함량(含量)은 감소(減少)되었다. 3. 잎과 줄기중(中) T-N, 유리(遊離)아미노산(酸), 엽록소함량(葉綠素含量)은 탄산석회시용구(炭酸石灰施用區)에서, $K_2O$, MgO, Allantoin, Ammonia 함량(含量)은 고토석회시용구(苦土石灰施用區)에서, CaO와 Nitrate함량(含量)은 소석회시용구(消石灰施用區)에서 가장 높았다. 4. 줄기중(中) 전당함량(全糖含量)은 황산석회(黃酸石灰)>무시용(無施用)>소석회(消石灰)>탄산석회(炭酸石灰)>고토석회순(苦土石灰順)이었다. 5. 야산개간지(野山開墾地)에서 석회비종별(石灰肥種別) 토양개량효과를 보면 탄산석회(炭酸石灰)는 산도교정력(酸度矯正力)과 Ca공급력(供給力)이 우수(優秀)했으며, 고토석회(苦土石灰)는 Mg공급력(供給力)이 우수(優秀)하였다. 6. 근류균(根瘤菌) 접종(接種)으로 주경장(主莖長), $m^2$당협수가 유의적(有意的)으로 증가(增加)했으며 종실수량(種實收量)은 무접종(無接種)보다 64%증가(增加)되었다. 석회비종별(石灰肥種別)로 보면 주경장(主莖長), 분지수, 종실수량(種實收量)은 탄산석회(炭酸石灰)>고토석회(苦土石灰)>소석회(消石灰)>황산석회(黃酸石灰)>무시용순(無施用順)이었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.367-370
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• 2007

An EEFL with the sodium free alumino-silicate glass of high K and low $tan{\delta}$, has been investigated. As compared with borosilicate and the soda-lime EEFLs, the luminous efficiency as well as the pinhole stability of new EEFLs improves remarkably without blackening of $NaHg_2$.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.514-519
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• 2001

Converter has been slag produced 10 million tons per year in Japan. It is a steel making by product produced in the same way as the blast-furnace slag. Though blast-furnace slag is being used effectively as a concrete admixture, the converter stag has never been used effectively because of the expansion action of contained free lime and iron oxide. This is an important environmental problem in the steel industry. Beta-2CaOSiO$_2$(beta-C$_2$S) is contained 40 percent in converter slag, therefore it is very promising as a concrete admixture. We proposed an accelerated aging processes capable of stabilizing the converter slag in a short time. The converter slag is dipped into alkali aqueous solution after heating at low temperature. It was subsequently ground to a grain size of 75 ${\mu}{\textrm}{m}$ , inner 30 percent of OPC. The properties of mortar and concrete using the blended cement were determined. As a result, it has become apparent that the expansion was reduced and long term compressive strength was increased while that at early ages was not so remarkable. The hydration exotherm rate was lower than that of the OPC.

• 한국건축시공학회지
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• 제11권5호
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• pp.442-451
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• 2011

Blast furnace slag is recycled as a high value-added material, while steel slag is difficult to recycle or is recycled as a low-grade filler material due to its expansive characteristics. Its property is caused by the high content of free lime and instable steel oxides. Recently, an innovative and rapid cooling method for melting steel slag has been developed in Korea, which reduces free lime content to a minimum level and increases the stability of steel oxides. However, researches on the long-term stability are not sufficient so far. Therefore, this study, focusing on the electric arc furnace oxidizing slag in the steel slag, aims to investigate the properties of the steel slag aggregate, its long-term volume stability and the engineering strength of mortar, and using it as a fine aggregate. This study result indicated that it was possible for it to be used as concrete aggregate because the volume change of the steel slag appeared to be stable.