골재 입도분포가 도로포장용 롤러 전압 콘크리트에 미치는 영향 연구

송시훈,이승우 한국도로학회 2015 한국도로학회 학술발표회 논문집 Vol.2015 No.3

시멘트 콘크리트포장은 경제적이면서도 우수한 내구성, 기능성 및 구조적 성능을 확보하여 사회 기반 시설인 도로 건설에 활발히 사용되고 있다. 그러나 최근 들어 지구온난화, 이상기후 및 자원 고갈 등의 환 경 문제로 인하여 환경 친화적인 건설의 중요성이 대두되면서, 시멘트 콘크리트포장의 주요 재료인 시멘 트 생산 공정 중에 발생되는 CO2 등의 온실가스로 인하여 환경을 저해하는 배타적인 재료로 인식되고 있 는 실정이다. 그러므로 콘크리트포장의 주요 재료인 시멘트 사용량의 절감을 통하여 시멘트 생산과정에서 발생하는 다량의 CO2와 화석자원 소비에 따른 친환경성에 대한 부정적인 요소를 환경 친화적 도로건설로 부응하고, 콘크리트 포장에 대한 잘못된 인식을 해소할 수 있다. 따라서 콘크리트 포장 고유의 우수한 성 능을 확보하면서 상대적으로 적은 단위 시멘트량을 사용하여 CO2 발생의 저감으로 친환경성 및 경제성을 확보하고, 정량화된 아스팔트 시공장비의 이용으로 신속하고 간소한 시공절차를 확보할 수 있는 저비용 롤러 전압다짐 콘크리트포장 공법(RCCP; Roller Compacted Concrete Pavement)의 도입이 요구된다. RCC는 페이스트의 체적이 일반 PCC보다 작기 때문에 배합에서의 공극을 최소화하기 위해 조밀한 입도이 어야만 한다. RCC 체적의 70%~85%를 구성하는 골재특성은 진동다짐시 요구하는 워커빌러티와 건조단 위중량을 도출하기 위한 역할을 하며, 압축강도, 휨강도, 온도 특성, 장기거동 및 내구성에 많은 영향을 준다. 이는 골재의 적절한 선택이 시공 중․후에 안전성을 제공하고 RCCP의 구조 및 성능에 영향을 미칠 중요한 요소 중 하나로 사료된다. 그러므로 PCA에서 제시하는 RCCP 골재입도 Band 영역 안의 골재 입 도가 RCCP에 미치는 특성에 대한 연구가 필요하다. 따라서 본 연구에서는 최대 치수 19mm 굵은 골재와 잔골재를 이용하여 상한선과 하한선 및 Band 영역 내의 골재 입도 분포를 설정하여 PCA에서 제시하는 RCCP 골재입도 Band가 RCCP 특성에 미치는 영향을 재검토하고, 입도분포에서 작은 비중을 차지하지만 시공 시 재료의 선정 과정에서 발생되는 양이 상당한 미립자 부분에 대한 영향을 파악하고 골재 선정 시 편의성과 경제성을 확보하기 위해 수정 Band를 제안하였다.

골재 입도분포가 도로포장용 롤러전압 콘크리트에 미치는 영향 연구

송시훈,이승우 한국도로학회 2015 한국도로학회논문집 Vol.17 No.3

PURPOSES : The use of environmentally friendly construction methods has been recently encouraged to reduce fuel consumption and the effects of global warming. For this purpose, the roller compacted concrete pavement (RCCP) construction method has been developed. RCCP is more environmentally friendly and economically efficient than general concrete by reducing the amount of CO2 generated through the application of a smaller amount of cement. RCCP has a number of advantages such as an easy construction method, low cost, high structural hydration performance, and aggregate interlocking. However, mix design standards and construction guidelines of RCCP are required for domestic application. In addition, a study on aggregate selection, which has an effect on the characteristics of RCCP, is necessary owing to a limited number of researches. Thus, the aggregate effect on the performance of RCCP in securing the required strength and workability was evaluated in consideration of domestic construction. METHODS : Sand and coarse aggregates of both 19mm and 13mm in maximum size were used in this study. Four types of aggregate gradations (s/a = 30%, 58%, and 70% for the sand and coarse aggregate of 19mm in maximum size, and s/a = 50% for a combination of the three types of aggregates) were set up to investigate the effects of the PCA band on the RCC characteristics. The conditions of s/a = 30% and 70% were evaluated to check the gradation effect outside of the recommended band. The conditions of s/a = 58% and 50% were used because they are the optimum combination of the two and three types of aggregates, respectively. RCCP gradation band was suggested gradation with a proper construction method of RCCP by synthetically comparing and analyzing the correlation of optimum water content, maximum dry density, and strength of requirements through its consistency and compaction test. RESULTS : The lower and upper limit lines are insufficient to secure a relatively strong development and workability compared to an aggregate gradation in the RCCP gradation band region. On the other hand, the line in the RCCP gradation band and the 0.45 power curve in the RCCP gradation band region were satisfactory, ensuring the required strength and workability. CONCLUSIONS: The suitable aggregate gradation on RCCP process should meet the RCCP gradation band area; however, fine particles passing through a #60 sieve do not need to be within the recommended gradation band because the influence of this region on such fine particles is small.

都市流域의 開發特性에 따른 流出特性變化

李曾錫,宋時勳 慶一大學校 1999 論文集 Vol.16 No.2

In this study, ILLUDAS model which is a model of runoff analysis in urban area is used to analyze runoff characteristics of urban area according to perpendicular and horizontal side gradients and lanes of a road in road drainage system. Peak flow and total disckarge which are the runoff characteristics of flood are analyzed for the perpendicular and horizontal gradients of each lane for probability years of 20 years using Huff's distribution type Ⅲ.

극한 호우시 소류지 방수로의 통수능력 채석

송시훈,임기석,지홍기,이순탁 한국수자원학회 2001 한국수자원학회 학술대회 Vol.2001 No.1

LEADING GLOBAL COMPANY- 대구텍

송시훈 한국분말야금학회 2015 분말야금기술회보 Vol.6 No.1

골재 입도분포가 도로포장용 롤러전압 콘크리트에 미치는 영향 연구

송시훈,이승우 한국도로학회 2015 한국도로학회논문집 Vol.17 No.3

PURPOSES : The use of environmentally friendly construction methods has been recently encouraged to reduce fuel consumption and the effects of global warming. For this purpose, the roller compacted concrete pavement (RCCP) construction method has been developed. RCCP is more environmentally friendly and economically efficient than general concrete by reducing the amount of CO2 generated through the application of a smaller amount of cement. RCCP has a number of advantages such as an easy construction method, low cost, high structural hydration performance, and aggregate interlocking. However, mix design standards and construction guidelines of RCCP are required for domestic application. In addition, a study on aggregate selection, which has an effect on the characteristics of RCCP, is necessary owing to a limited number of researches. Thus, the aggregate effect on the performance of RCCP in securing the required strength and workability was evaluated in consideration of domestic construction. METHODS : Sand and coarse aggregates of both 19mm and 13mm in maximum size were used in this study. Four types of aggregate gradations (s/a = 30%, 58%, and 70% for the sand and coarse aggregate of 19mm in maximum size, and s/a = 50% for a combination of the three types of aggregates) were set up to investigate the effects of the PCA band on the RCC characteristics. The conditions of s/a = 30% and 70% were evaluated to check the gradation effect outside of the recommended band. The conditions of s/a = 58% and 50% were used because they are the optimum combination of the two and three types of aggregates, respectively. RCCP gradation band was suggested gradation with a proper construction method of RCCP by synthetically comparing and analyzing the correlation of optimum water content, maximum dry density, and strength of requirements through its consistency and compaction test. RESULTS : The lower and upper limit lines are insufficient to secure a relatively strong development and workability compared to an aggregate gradation in the RCCP gradation band region. On the other hand, the line in the RCCP gradation band and the 0.45 power curve in the RCCP gradation band region were satisfactory, ensuring the required strength and workability. CONCLUSIONS: The suitable aggregate gradation on RCCP process should meet the RCCP gradation band area; however, fine particles passing through a #60 sieve do not need to be within the recommended gradation band because the influence of this region on such fine particles is small.

보관온도 및 기간에 따른 녹차우린물의 대사체 변화

송시훈(Sihoon Song),이선진(Seon-Jin Lee),추민아(Min A Choo),문제학(Jae-Hak Moon),조정용(Jeong-Yong Cho) 한국차학회 2023 한국차학회지 Vol.29 No.4

본 연구에서는 LC-MS 대사체 분석 및 다변량 통계분석을 통해 보관온도 및 보관기간에 따른 녹차우린물의 대사체 변화를 이해하고자 하였다. 실온(25℃)과 냉장(4℃)에서 0, 1, 3, 그리고 5일 동안 보관한 녹차우린물들을 대상으로 UPLC-ESI-Q-TOF-MS를 이용하여 대사체 분석을 실시하였다. 그 결과, 녹차우린물에서는 catechin류를 포함한 총 42종의 화합물이 검출되었다. LC-MS 대사체 분석 결과를 기반으로 PLS-DA 결과에서 냉장 및 상온에서 보관한 녹차우린물 간에 뚜렷한 차이를 나타냈다. 또한 냉장보관이 다른 녹차우린물들 간에는 뚜렷하게 구별되지 않았으나, 상온에서 보관한 녹차우린물들 간에는 확연하게 구별되었다. 즉상온에서 보관기간이 길어질수록 대사체 변화가 큼을 확인할 수 있었다. 이들을 구별하는 주요 성분들(VIP>1.0)은 epigallocatechin, kaempferol glucosyl rhamnosyl glucoside, 그리고 epicatechin gallate을 포함한 12 종의 화합물이었다. 주요 catechin류 등 대부분의 대사체 함량은 상온 또는 냉장보관에 따라 다소 차이를 보였으나, 보관기간이 길어질수록 감소하는 경향을 나타냈다. 반면에, glucogallin, gallic acid, isoschaftoside, theacitrin A, 그리고 vicenin 2는 실온에서 보관하는 동안 그 함량이 증가하는 경향임을 heatmap plot에서 확인할 수 있었다. 이상의 결과들은 가정에서 녹차우린물을 보관하여 음용하는데 유용한 자료로의 활용이 기대된다. This study was undertaken to document changes in the metabolite composition of infused green tea according to storage temperature and time using LC-MS-based metabolite analysis and multivariate analysis. Infused green tea was stored at room temperature (25°C) or in a refrigerator (4°C) for 0, 1, 3, or 5 days. UPLC-ESI?Q-TOF-MS showed that 42 compounds, including catechins and flavonoids, were present in infused green tea. PLS-DA revealed a significant difference between infused green tea samples stored at 4 or 25℃ and between samples refrigerated for different times. On the other hand, metabolites in samples stored at room temperature for different times showed more obvious changes. Twelve metabolites with a high VIP score (VIP>1.0) included epigallocatechin, kaempferol glucosyl rhamnosyl glucoside, and epicatechin gallate. A heatmap plot showed that the concentrations of most metabolites were reduced in infused green tea samples during refrigerated or room-temperature storage. In particular, glucogallin, gallic acid, isoschaftoside, theacitrin A, and vicenin 2 concentrations were increased during room temperature storage. Furthermore, metabolite concentrations were far more sensitive to storage at room temperature than refrigerated storage. The study provides useful information about changes in infused green tea metabolite levels during short-term storage.

기상화학반응법에 의한 안티몬 도우프 산화주석 미분체의 합성 및 분체특성

송시훈,김규호 嶺南大學校工業技術硏究所 1992 연구보고 Vol.20 No.2

By the chemical vapor deposition method, the preparation and powder characterization of antimony-doped stannic oxide powder were carried out And the effects of reaction temperature and the amount of antimony addition were investigated on antimony dopping amount, particle size and shape. The products were identified as antimony-doped stannic oxide blue in color. The size of antimony doped stannic oxide powder became smaller than the pure stannic oxide and decreased with the increasing of reaction temperature. The dopping amount and particle size showed a little change with the amount of antimony addition but the antimony dopping amount increased with the increasing of reaction temperature.

연안유역의 극치수위에 대한 근사 결합확률 분석에 관한 연구

이영민,송시훈,지홍기,이순탁 한국수자원학회 2001 한국수자원학회 학술대회 Vol.2001 No.1

우수이용 시스템의 설계와 운영

전인배,송시훈,지흥기,이순탁 한국수자원학회 2001 한국수자원학회 학술대회 Vol.2001 No.1