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김종백 ( Jong-back Kim ),차완호 ( Wan-ho Cha ),권오봉 ( O-bong Kwon ),한민철 ( Min-cheol Han ),한천구 ( Cheon-goo Han ) 한국건축시공학회 2006 한국건축시공학회 학술발표대회 논문집 Vol.6 No.2
This paper is to investigate the chemical composition and physical properties of cements collected at different crushing process line of ordinary portland cement to verify the possibility for producing special purpose cement based on the particle distribution technique. According to test results, six different cement samples with different blaine were gathered. loss on ignition and chemical composition of cements gathered were satisfied with KS L 5201. Cement collected at line 5 had the lowest blaine value while cement at line 4 had the highest blaine value. The coarser the cement particle is, the larger the fluidity of cement is. The compressive strength of cement was highly affected by the blaine value of cement. It is confirmed that the use of cement produced by the process of particle distribution control maybe applied for special purpose cement with out modification of chemical composition.
조강형 시멘트의 광물조성, 분말도, SO₃ 함량이 모르타르 및 콘크리트 압축강도에 미치는 영향
최재원(Choi, Jae-Won),차완호(Cha, Wan-Ho),한민철(Han, Min-Cheol) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.2
High Early Strength cement (HEC) develops strength faster than Ordinary Portland cement (OPC) and is different in mineral composition, fineness, and chemical composition. This study statistically analyzes the effect of mineral composition, fineness, and chemical composition of 36 HEC samples produced in a single cement plant on the compressive strength of mortar and concrete. The results reflect that Blaine had the most positive effect on the 1-day compressive strength of both mortar and concrete, but the increase of Blaine showed a negative effect on the 28-day compressive strength and concrete slump. The contents of C3S showed the most significant effect on the 28-day compressive strength. Additionally, there was no significant correlation between the 1-day and the 28-day compressive strength of HEC.
시멘트 분말도가 광촉매 시멘트 페이스트의 질소산화물(NOx) 제거 성능에 미치는 영향
최재원(Choi, Jaewon),기태경(Ki, Tae-Kyoung),차완호(Cha, Wan-Ho),한민철(Han, Min-Cheol) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.8
In this study, we researched a method to increase the photocatalytic reaction efficiency of TiO₂ particles while fixing TiO₂ to the concrete surface using cement paste. For this purpose, we analyzed effects of cement fineness on the surface area and air purification performance of hardened cement paste containing TiO₂. At the test level of this study, it was confirmed that the lower the fineness of OPC shows the better the NO and NOx removal rates, indicating better air purification performance. To identify the cause, the particle size distribution of the cement, the roughness of the surface of the hardened paste, and the lightness were analyzed. The results of the analysis show that the lower the fineness of cement, the surface roughness increases, so the exposed area of TiO₂ contained in the paste also increases. As a result, NOx removal rate is improved when the lower the fineness of cement.
시멘트 클링커 소성공정 대체연료 사용량과 시멘트 품질간 상관관계 연구
최재원(Jaewon Choi),구경모(Kyung-Mo Koo),유병노(Byeong-Know You),차완호(Wan-Ho Cha),강봉희(Bong-Hee Kang) 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.1
본 연구에서는 시멘트 제조공정에서 연료로 사용된 가연성 산업부산물 및 생활폐기물 대체연료 사용량과 시멘트 품질 중에서도 화학성분, 광물조성, 압축강도간의 상관관계를 확인하고자 하였다. 이를 위해 천연연료로서 유연탄, 대체연료로서 연질 플라스틱류(비닐류 등 풍력에 의해 비산되기 쉬운 성질의 플라스틱류), 경질 플라스틱류(이물질이 혼입되거나, 폐고무, PP 등 풍력에 비산되지 않는 성질의 플라스틱류), 재생유를 사용하는 국내 A시멘트 제조사 소성설비의 2017∼2019년 3년간의 연료투입량을 독립변수로 하고, 시멘트 품질 데이터를 종속변수로 하여 요인 회귀분석을 이용한 분석을 실시하였다. 분석 결과 대체연료의 종류 및 품질에 따라서는 화학성분(염소 및 LSF) 및 광물조성(f-CaO, C₃S량)에 유의한 영향을 미치지 않았으며, 시멘트 압축강도를 저하할 것이라는 우려와는 달리 대체연료 사용량과 시멘트 압축강도간에 유의한 양의 상관관계가 성립하는 것으로 분석되었다. In this study, the correlation between cement quality(chemical composition, mineral composition, and compressive strength) and amount of waste alternative fuels used in the cement manufacturing process and was investigated. Cement manufacturing facility using coal, soft plastics(plastics that are easily scattered by wind power, such as vinyls), hard plastics(plastics that do not contain foreign substances, waste rubber, PP, etc.) and reclaimed oil was analised. Data was collected for 3 years from 2017 to 2019 and let the amount of fuels used as an independent variable and cement quality data as a dependent variable. As a result, depending on the type and quality of the alternative fuel has not a significant effect on the chemical composition(Cl and LSF) and mineral composition(f-CaO, C₃S contents). Contrary to the concern that the compressive strength of cement would decrease, there was a significant positive correlation between amount of alternative fuel used and cement compressive strength.
고로슬래그미분말 및 팽창재를 혼입한 조강형 모르타르의 역학적 특성
구경모(Kyung-Mo Koo),최재원(Jae-Won Choi),유병노(Byeong-Know You),차완호(Wan-Ho Cha),강봉희(Bong-Hee Kang) 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.2
본 연구에서는 탄소저감 및 시멘트 성능 향상을 목적으로 조강형 모르타르에 대하여 산업부산물인 고로슬래그미분말(GGBFS) 및 팽창재(EA)가 미치는 영향을 검토하였다. 그 결과, 보통포틀랜드시멘트(OPC)에 비해 조강형시멘트(EPC)는 플로가 감소하는 경향을 보였으나, EPC와 GGBFS를 함께 사용하는 경우 OPC보다 높은 유동성의 확보가 가능하였다. 또한 EPC는 OPC 대비 높은 압축강도를 보였으나, 수축이 증가하는 경향을 보였다. EPC에 GGBFS를 사용하는 경우, 그 혼입률에 따라 비례적으로 압축강도는 감소하고, 수축량은 커지는 경향을 보였으며 수축은 저온조건에서 더욱 증가하였다. EPC 및 GGBFS로 구성된 결합재 조건에서, EA는 압축강도를 향상시키고, 초기재령의 수축을 저감시키는 효과를 확인하였다. In this study, the effects of ground granulated blast furnace slag(GGBFS) and expansive additive(EA) on early strength mortar were examined for the purpose of reducing carbon and improving cement performance. As a result, ealry strength Portland cement(EPC) tended to decrease in flow compared to ordinary Portland cement(OPC), but binder with EPC and GGBFS was possible to obtain higher liquidity than OPC. EPC showed higher compressive strength and shrinkage than OPC. The compressive strength of specimen with EPC and GGBFS was reduced proportionally to the replacement ratio of GGBFS. The replacement ratio of GGBFS above the compressive strength equivalent to OPC was higher under low temperature conditions. The use of GGBFS resulted in high shrinkage compared to OPC, and this characteristic was even greater under low temperature conditions. The shrinkage of specimen with EA was decreased in early ages, but was higher than the OPC in long-term ages.
입도분급 시멘트의 분말도 변화에 따른 고강도 콘크리트의 기초적 특성
최성용 ( Sung-yong Choi ),김성환 ( Seong-hwan Kim ),차완호 ( Wan-ho Cha ),권오봉 ( O-bong Kwon ),한민철 ( Min-cheol Han ),한천구 ( Cheon-goo Han ) 한국건축시공학회 2007 한국건축시공학회 학술발표대회 논문집 Vol.7 No.1
This study investigates the fundamental properties of high strength concrete made with various blaine values of cement, manufactured by the particle screening method in a pulverizing process. Test showed that concrete using lower blaine of cement, such as large particle (L) and both ordinary and large particle (OL), increased the fluidity of fresh concrete. As time progressive, it was noticeable that the specimens using ordinary cement (OPC) gradually decreased the fluidity, but the other specimens showed the sudden decline until 30 minutes, which is followed by a gradual decrease after 60 minutes. For the setting time, higher blaine of cement accelerated the initial and final setting time, especially concrete using minute size of cement (M) was 10 hours faster than OPC. Compressive strength of L exhibited similar value at 1 days as to that of strength in OPC at 3 days. Importantly, the specimens using M also revealed the similar strength value, regardless of curing temperature between -5℃and 20℃, which means that using this minute particle of cement in concrete can secure the strength development even in the lower temperature circumstance. Therefore it is clear that using OPC+M simultaneously at cold weather concreting can resist the early frost and develop the early strength of concrete.
광촉매 시멘트 페이스트 시공방법이 NOx 제거 성능에 미치는 영향
최재원(Choi, Jae Won),기태경(Ki, Tae Kyoung),차완호(Cha, Wan Ho),한민철(Han, Min Cheol) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 광촉매가 함유된 시멘트 페이스트의 질소산화물(NOx) 제거 성능 평가 연구의 일환으로, 시멘트 페이스트의 시공방법(미장 vs 뿜칠)이 NOx 제거 성능에 미치는 영향에 대해 분석하였다. 시험 결과 시멘트 페이스트를 뿜칠 시공할 경우, 미장 시공한 경우보다 NOx 제거 성능이 뛰어난 것으로 평가되었는데, 이는 표면구조의 균일성에 따라 표면의 거칠기에 차이가 발생하고, 그 결과 광촉매 입자의 노출 면적에도 차이가 발생해 NOx 제거 성능에 영향을 미친 것으로 판단된다. In this study, we reserached on the effect of the cement paste placing method (plastering vs. spraying) on the NOx removal performance. As a result, it was evaluated that the NOx removal performance was superior to the case of spraying the cement paste of the same mixture compared to the case of plastering. It is assumed that there was a difference in the exposed area of the NOx and affected the NOx removal performance.