고로슬래그 미분말을 65% 치환한 고성능 콘크리트의 자기 및 건조수축 특성

장승엽,류화성,윤용식,권성준 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.3

고로슬래그 미분말은 공학적으로 우수한 건설산업 부산물이며, 최근들어 환경부하 저감 및 사용 활성화를 위해 대단위 슬래그 치 환 콘크리트가 많이 연구되고 있다. 본 연구에서는 목표 강도를 50 MPa로 설정하고 고로슬래그미분말 치환률을 65%로 고려한 대단위 치환 슬 래그 콘크리트를 제조하여 건조수축특성과 초지재령 특성을 평가하였다. 이를 위해 3 수준의 콘크리트를 제조하였으며, 슬럼프 플로우, 강도, 건조 및 자기수축에 대한 실험을 수행하였다. 실험결과, 보통 포틀랜트 시멘트를 100% 함유한 콘크리트(OPC 100)에 비하여 재령 7일전의 강 도는 약간 감소하였으나, 슬래그 치환 배합은 수화에 필요한 충분한 자유수를 가졌으므로 28일 재령에서는 우수한 강도 발현을 나타내었다. 또 한 재령 3일까지 큰 자기수축으로 인하여, OPC 100 배합에서는 건조수축이 크게 평가되었지만, 65% 고로슬래그 미분말을 치환한 배합에서는 초기재령의 자기수축 성능이 개선되어 우수한 건조수축거동을 나타내었다. 특히 단순 질량 치환배합(BS 65)보다 물-결합재비(0.27)와 단위수 량(163kg/m3)을 낮춘 OPTBS 65에서 더욱 우수한 건조수축 및 자기수축 거동을 나타내었다. GGBFS (Ground Granulated Blast Furnace Slag) is a byproduct with engineering advantages and HVSC (High Volume Slag Concrete) is widely attempted due to active utilization and reduction of eco-load. In the present work, characteristics of drying shrinkage and early-aged behavior are evaluated for the concrete with 65% replacement ratio of GGBFS and 50MPa of design strength. For the work, 3 different mix conditions are considered and several tests including slump flow, compressive strength, drying and autogeneous shrinkage are performed. From the test, OPC 100 mixture without replacement shows higher strength development before 7 days, however the strength reduction in concrete replaced with GGBFS is not significant due to sufficient free water for cement hydration. OPC 100 mixture also shows significant drying shrinkage due to a great autogeneous shrinkage before 3 days. In the concrete with GGBFS replacement, the drying shrinkage behavior is improved due to relatively small deformation by autogeneous shrinkage. The mixture (OPT BS 65) with lower w/b ratio (0.27) and unit content of water (160kg/m3) shows more improved shrinkage behavior than BS 65 mixture which has simple replacement of GGBFS with 0.30 of w/b and 165kg/m3 of water unit content.

경주지역 도로유구의 시대적 재해석

장승엽 동국대학교 WISE(와이즈)캠퍼스 신라문화연구소 2020 新羅文化 Vol.57 No.-

This study analyzes the road vestiges excavated and researched in Gyeongju area, which was the royal place during ancient Silla Kingdom in order to check the structure of the road system during that period. Though there are many road vestiges found in Gyeongju area, most of them were interpreted as the roads made during Silla Kingdom and Unified Silla Kingdom. Most of the researchers have not focused on the sequence of the times on the study of ancient roads but has limited the study on the Bangrije of Silla to the road made in Unified Silla kingdom. This kind of research trend led to the result of interpreting the time based on only the soil layer and Archaeological Relics made in Unified Silla Kingdom even though they are only the visible aspects of the Archaeological Relics. The author judged that it was wrong to judge the timing of the excavated relics based on the excavated relics. The author believes that it is not right to judge the length of use of the road just by its appearance, as the soil layer of the road has been severely disturbed and the upper floors have been damaged recently. In addition, most road markings must be connected to the boundary of the research area before they can be connected to the surrounding site. Once the road is constructed, it can be used consistently through improvements and repairs if necessary. Based on this, we analyzed 64 roads found in Gyeongju. The road Archaeological Relics estimated to have been made in the Unified Silla period and the traces considered to have been used during the Joseon era were compared with other data. In addition, they compared the directions of the roads in the ancient maps and the modern maps produced during the Japanese Empire State and saw if they were related to each other. They then compared with aerial photographs of Gyeongju, which were taken in 1954, to identify changes in terrain and roads leading to modern times. As a result, the road and surrounding Archaeological Relics whose artifacts can span up to Joseon Kingdom were found out and the roads were confirmed which connected to the main area located in Gyeongju area by period. This means that a road was either used for a period only or continuously used at the new space as time goes by. These results confirm that there shall be new research on the road vestiges of many roads which has been researched. However. as shown in the fact that even a confirmed road vestige can be connected to the research and excavation site. So, the total interpretation shall not be made with a part of the Archaeological Relics only. Likewise, the study has limitation as it cannot escape the assumption to some extent. Notwithstanding this, for the study of the period of road and how long it lasted, it is necessary to always make the comprehensive comparison and review of the related data.

고속철도 콘크리트 슬래브 궤도의 최신 기술

장승엽,강윤석,김은,Jang Seung Yup,Kang Yun Seok,Kim Eun 한국콘크리트학회 2004 콘크리트학회지 Vol.16 No.4

철도교 설계를 위한 궤도-교량 상호작용 해석

장승엽,Jang, Seung-Yeop 한국전산구조공학회 2019 전산구조공학 Vol.32 No.1

계피, 계지 및 계심의 규격 및 품질평가법에 관한 연구

장승엽,강신정,이종필,박상용,신지현,정영자,박진영,하광원,박종희,박정일 식품의약품안전청 1998 식품의약품안전청 연보 Vol.2 No.-

계피, 계지와 계심은 해열, 진통의 목적으로 사용되는 생약애다. 본 연구에서 cinnamaldehyde, cinnamic.acid,총탄닌 띤 정유에 대하여 분석하였다. 그 결과는, 1) 이 들 생약의 각 met'hanoi추출물과 ether추출물의 핀PLC 크로마토그램 양상은 서로 비슷하였다. 2) Methanol추출물과 ether추출물의 cinBamic acid 함량은 거의 비슷하였으나, cinnamaldehyde 함량은 ether추출물에서 더 많이 검출되었다. 3) 이 들 생약의 정운추출물을 GC와 GC/MSD로 분석한 결과 cinnamaldehyde가 주성분으로 검토되었다.또한 methanol추출물과 methanol에 웅해한 cinnamaldehyde 표준액에셔 rnethoxycinnamic acid로 추전되는 성분으로 변화하는 것을 알 수 있었으며, 시간이 지남에 따라 이 성분의 함량이 점점 증가함을 관찰할 수 있었다. 4) Folia-Denis법에 의하여 계피와 계지에서 총탄닌을 둔석한 결과 계피에서는 2.4~ 13.2%, 계지에서는 5.1-10.8%로 검출되었다. 중국에서 수입되는 계피에서는 7.2~9.1%, 베트남에서 수입되는 4.4~9.5%로 검출되었다. Cinuarnomi Cortex, Cinnamomi Ramulus and Cassino Cortex Interior are used as an antipyretic, anodyne eft. The contents of cinnamald☞hyde, cinnamic acid and total tannins as well as theamount of essential oil were assayed in this study. The results were as follows ; 1) The HPLC chro.matograms of methanol extract from these herb drugs were very similar to those ofether extract. 2) The contents of cinnamic acid between methanol and ether extract were almost same, but the con-tents of cinnamaldehyde in ether extract were higher than 1,hose in methanol extract. 3) eC and GC/MSD analyses of essential oil derived from these herb drugs revealed thatcinnamaldehyde was the main component and a unknown peak presumed to be rnethoxycinnamic acidwas found from methanol stock solutions of cinnamaldehyde and these herb drugs. The amount of thiscomponent was increased according to the time elapsed. 4) Total tannin contents assayed by Folin-Denis method in Cinnamomi Cortex and CinnamomiRamulus were determined as 2.4~13.2% and 5.1 ~10.8%, respectively, and total tannin contents ofCinnamomi Cortex from China and Vietnam were also determined as 7.2~9.1% and 4.4~9.5%,respectifely.

변형력이 해소된 대칭형 장주기 광섬유 격자 제작

장승엽,오승태,김복현,한원택,백운출,정영주 한국통신학회 2002 한국통신학회 기타 간행물 Vol.2002 No.10

진동과 구조전달소음 저감을 위한 플로팅 슬래브궤도 설계 기술

장승엽 한국철도학회 2020 철도저널 Vol.23 No.4

韓國 모더니즘 詩의 基本 패턴 Pattern 試論 : 특히 金起林, 鄭芝溶, 金光均, 朴寅煥을 中心으로

張承燁 동아대학교 국어국문학과 1983 국어국문학 Vol.5 No.-

차세대 고속철도 인프라 발전 방안

장승엽,여인호 국토연구원 2017 국토 : planning and policy Vol.428 No.-

조직배양에 의한 약용식물자원의 생약학적 연구(Ⅸ) : 카르두스 마리아누스의 캘러스 형성에 미치는 아미노산의 영향 Effects of amino acids on the callus formation of Silybum marianum

장승엽,성락선,강신정,이춘길,하광원,류점호,이경순 식품의약품안전청 1998 식품의약품안전청 연보 Vol.2 No.-

카르두스 마리아누스의 조직배양에 있어서 식물생장조절물질에 따른 캘러스의 형성과 캘러스 증식에 미치는 아미노산의 영향을 조사하였다. 그 결과 캘괴스의 유도를 위하써는 2,4-D 0.Img/f에 kiBetin 1.Omg/j 조합처리가가장효과적이었다. 아미노산의 처리에 파른 캘러스의 증꼭상태는 L-phenylalanine>L-leucine)L-valine=L-thrrf nine의 순으로 캘러스 증식이 잘 되었다. 특히 L-phenylalanine은 어느 농도에서도 캘러스 증식이 잘 되었으며 Of mg/스과 농도에서 가장 활발하였다. 아미노산의 처리를 따른 캘러스에서의 silybin 및 silymarin의 성분함량을조각한 결파 L-phenylalanine 0.Smg/f의 농도에서 silybiii의 함량이 0.19mg/g으로써 가장 높게 나타났다. Tissue culture was accomplished to j;nvestigate the effects of antino acids on callus proliferation of fifroun wtarianuuL The callus induction frein the leaf was most effective iu combinationtreatment with 0.Img/f 2.4-D and 1.emg/j kinetin. The callus proliferation was most effective in the me-dium supplemented with 0.Img/f 2,4-D and 0-Smg/f L-phenylalanine. In this condition, the content ofsilybin in callus was 0.19mg/g.