섬유보강 순환잔골재 콘크리트의 공학적 특성 및 수축균열저감특성에 관한 실험적 연구

김규용,남정수,김무한,이도헌,송하영,Kim, Gyu-Yong,Nam, Jeong-Soo,Kim, Moo-Han,Lee, Do-Heun,Song, Ha-Young 한국건설순환자원학회 2009 한국건설순환자원학회지 Vol.4 No.3

최근 국내에서는 건설생산현장에서 순환골재 및 이를 활용한 순환골재 콘크리트의 사용을 적극적으로 도모하기 위하여 순환골재 콘크리트의 제조기술에 관한 다양한 연구개발이 활발하게 이루어지고 있으나 순환굵은 골재에 비하여 순환잔골재에 관한 적용 및 연구는 미흡한 실정이다. 따라서 본 연구에서는 순환잔골재를 사용한 환경부하저감형 콘크리트의 공학적 성능 및 수축균열저감 성능 향상을 위한 섬유보강 순환잔골재 콘크리트의 공학적 특성 및 수축균열특성에 관하여 실험 실증적으로 비교 검토함으로써 향후 환경부하 저감형 섬유보강 순환잔골재 콘크리트의 개발을 위한 기초자료를 제시하고자 한다. 그 결과, 천연잔골재에 비해 순환잔골재의 사용으로 콘크리트의 균열면적이 증가하였으며, W/C비가 증가할수록 균열면적도 증가하는 것으로 나타났다. 또한 섬유종류중 PVA 및 Nylon섬유를 혼입한 시험체의 균열면적이 가장 적은 것으로 나타났으며, 섬유혼입율이 증가할수록 균열면적이 감소하는 것으로 나타나 섬유혼입에 의한 균열저감성능을 확인할 수 있었다. Recently, the study is progressing actively about manufacture skill of concrete for promoted recycled aggregate and concrete made into recycled aggregate in the construction production field. But, application and study about recycled fine aggregate insufficient compared to recycled coarse aggregate. So, in this study, it presents basic data for development of environmental load reduction fiber reinforcement recycled fine aggregate concrete by comparison and investigation about engineering properties and shrinkage cracking of fiber reinforcement recycled find aggregate concrete for increasing shrinkage cracking reduction and long term stability of environmental load reduction concrete used recycled fine aggregate. In the result of the study, compared to natural fine aggregate, a crack-extent increased by applying recycled fine aggregate, moreover, as a water cement ratio increased, the crack size increased, as well. In addition, it's shown that the specimen mixed with PVA and Nylon, among all kinds of fibers, showed the smallest crack size, so it's verified that the mix of fiber had an effect on decreasing crack-extent.

고속 비상체의 충돌을 받은 섬유보강 모르타르의 내충격 성능 평가

김규용,남정수,미야우치 히로유키,Kim, Gyu-Yong,Nam, Jeong-Soo,Miyauchi, Hiroyuki 대한건축학회 2011 대한건축학회논문집 Vol.27 No.9

Recently, the damaged building and loss of life have been increasing by man-made disasters. In this study, the impact resistance performance of fiber reinforced concrete against high-velocity projectile was evaluated by using high pressure gas apparatus and AUTODYN. Plain mortar specimen was penetrated by steel projectile at 350 m/s and was fractured heavily at the backside. On the other hand, the PVA, PE and STF specimens reinforced with fiber have higher impact resistance than plain mortar, and were analyzed by Hughes equation. Finally, the impact resistance of specimens was calculated from viewpoint of fracture mode by AUTODYN and it was concluded that fiber reinforced concrete improve the impact resistance performance.

과학사적 학습지도 : 새로운 과학 학습지도법의 제안

김규용,양승훈 濟州大學校 師範大學 科學敎育硏究所 1997 科學敎育 Vol.14 No.-

We suggest the possibility of "historical teaching" as an effective strategy for teaching science in classroom. At first, we survey the historical background for historical teaching of science, and then present the possible merits of introducing the history of science into science class: (1) to overcome the misconceptions of students in science; ( 2 ) to bridge science and other disciplines; ( 3 ) to understand the social aspects of science; (4) to understand the nature of science and scientific method, etc. Finally, we present briefly the some limits of historical teaching.

가열 및 재하에 의한 콘크리트의 압축거동

김규용,정상화,이태규,김영선,남정수 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.4

화재시 콘크리트의 성능저하는 재하조건, 열팽창 및 크리프 등과 같은 여러 가지 요인에 대하여 영향을 받을 수 있다. 1950년대부터 일본, 유럽, 미국과 같은 선진외국에서는 고온을 받은 콘크리트의 특성에 관하여 많은 연구들이 행해지고 있으나 재하조건, 가열방법, 시험체의 크기 및 가열장치의 성능 등과 같은 다양한 요인들이 연구자들의 독자적인 방법에 의해 실험이 진행되고 있다. 이에 본 연구에서는 시험체 크기, 가열속도, 시험방법이 유사한 일본 및 국내의 연구를 바탕으로 가열 및 재하를 받은 콘크리트의 역학적 성능에 대하여 분석하였으며, 상온 및 고온에서의 상관관계분석, 압축강도 추정곡선을 산출하여 CEN 및 CEB code와 비교․평가하였다. 그 결과 재하가열을 받은 콘크리트는 100℃~400℃의 범위에서 역학적 특성에 대한 재평가의 필요성을 확인하였다. The performance deformation of concrete can be caused by many factors such as load, thermal strain and creep at high temperature. Japan, Europe and America have been doing various experimental studies to solve these problems about thermal properties of concrete at high temperature, each study has generated different results due to a heating methods, heating hours, size of specimens and performance of a the loading, heating method, size of specimen and heating machine. There has been no unified experimental method so far. Therefore, this study reviewed experimental studies on the strength performance of concrete subject to heating and loading method. As a result, compressive strength of specimen prestressed increase in the temperature range of between 100℃ and about 400℃. Also, results can be analyzed as compare equation of compressive strength at elevated temperature with CEN and CEB code.

폐기콘크리트를 활용한 재생골재의 각종 물성에 관한 실험적 연구

김규용,이정율,박유신,임정수,김무한 한국폐기물자원순환학회 1998 한국폐기물자원순환학회지 Vol.15 No.3

건설구조물(建設構造物)의 장수명화(長壽命化)와 건설폐기물(建設廢棄物)의 유효이용기술(有效利用技術)

김규용,최형길,남정수,송하영,이도헌,Kim, Gyu-Yong,Choi, Hyeong-Gil,Nam, Jung-Su,Song, Ha-Young,Lee, Do-Heun 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.3

최근 지구환경의 문제가 사회적 이슈로 부각됨에 따라 자원절약 및 자원의 유효이용이라는 측면에서 일상생활에서부터 각종 산업분야에 이르기까지 재활용과 자원절약에 관한 관심이 날로 심화되고 있는 가운데 지구 온난화 방지, 자연환경파괴의 방지, 폐기물에 의한 환경오염 방지 등 지구환경보전 측면에서 콘크리트용 골재 자원의 고갈, 시멘트 소성에너지, $CO_2$ 저감 등은 해결이 불가피한 문제로서의 당면한 과제이다. 이에 따라 건설 산업의 분야에 있어서도 건축물의 내부에 축적되어 있는 막대한 양의 자원을 유효하게 활용하고 내구수명이 길게 설계된 장수명화 건축물을 안전하고 쾌적하게 유지 관리함으로써 불필요한 건설행위를 억제하여 지구자원 및 에너지를 절감하는 창조적인 사고가 필요하다고 할 수 있다. 본고에서는 건설폐기물 발생 억제 및 유한한 지구자원의 유효이용과 재활용을 활성화시킴으로서 지구환경부하 저감을 위한 건축생산 및 건축물의 성능설계 측면에서 건축적 요구와 지구환경을 고려한 건축물의 장수명화를 위한 방법 및 건설폐기물의 유효이용기술에 대해 소개하였다. Recently the problem of global environment is became by social issue. Accordingly the interests to recycling and saving of resources are growing from daily life to varieties field of industry. To preserve the global environment, prevent global warming, environmental destruction, environmental pollution by wastes, the drain of aggregate, plasticity energy of cement and decrease in carbon dioxide are an urgent problem that must be resolved. So there is to a field of building industry and stands but on the inside of the building the many double meaning resources usefully, applies. Also the seller masterpiece building where the service life is long planned is safe and comfortably, maintenance, suppresses the construction which is not necessary is unnecessary. Also the seller masterpiece building where the service life is long planned is safe and comfortably, maintenance, suppresses the construction which is not necessary is unnecessary. By revitalizing effective use of limited earth resources, recycling and controling production of construction waste, this study introduced to a method for Long-Term Durability of Construction Structure and Effective Use of Technology for Construction Waste considering architectural demand and earth environment. It is for reduction of an earth environment load from the side of construction production and performance design of a structure.

고강도 매스콘크리트의 수화지연효과에 따른 수화발열상승속도 및 자기수축의 저감 특성 평가

김규용,구경모,신경수,이의배,강연우,타케우치 토루,Kim, Gyu-Yong,Koo, Kyung-Mo,Shin, Kyoung-Su,Lee, Eui-Bae,Kang, Yeon-Woo,Takeuchi, Tohru 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1

In this study, to reduce the hydration heat velocity of the high-strength mass concrete at early ages, micro encapsuled retarder that could retard cement reaction was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated. In the result of research, the retardation of the cement hydration process by the micro encapsuled retarder leads to an late setting, with no effect on the development of the compressive strength of concrete. The hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the use of the micro encapsuled retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.

고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가

김규용,이태규,민충식,이계혁,남정수,김영선,Kim, Gyu-Yong,Lee, Tae-Gyu,Min, Choong-Siek,Lee, Kye-Hyouk,Nam, Jeong-Soo,Kim, Young-Sun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3

It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on ${\O}100{\times}200mm$ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to $700^{\circ}C$, and the residual compressive strength compared to that observed at $20^{\circ}C$. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over $500^{\circ}C$.

H∞ 제어를 이용한 공기스프링방진대의 강건제어 ( Robust Control of Air-Spring Vibration Isolation Table Using H∞ Control )

김규용,양현석,박영필 대한기계학회 1995 대한기계학회 춘추학술대회 Vol.- No.-

방문 물리치료 비용편익 분석

김규용,원승현 대한치료과학회 2022 대한치료과학회지 Vol.14 No.2

Objective: The purpose of this study is to present a basic data for policy which activate the introduction of the home based physical therapy services policy and the home based physical therapy in the visiting home care service on the basis of policy. Method: The design of this study is performed a home based physical therapy to the patients with cerebrovascular, the cost-benefit analysis of home based physical therapy with cerebrovascular patient which is analyzed on basis of survey data of the 51 rehabilitative care hospital medical institutions in nationwide and the number of nursing system, has analyzed the economic benefit in calculate the annual net social benefit through sensitivity analysis after calculated 1times per physical therapy. Results: This study are in the survey of the direct costs of the rehabilitation and convalescence hospital of visit’s cost-benefit analysis in patients with cerebrovascular disease, home based physical therapy way’s cost-benefit ratio more 1.8 times than medical center visit‘s way so that the net social benefit of home based physical therapy way has been analyzed to 18,028 million won. Conclusion: The business features of cheaper, home based physical therapy services has a more economical effect than medical center visit.