• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2018.11a
• /
• pp.88-91
• /
• 2018

국내 연안에 설치된 항로표지(등부표,등대 등) 대부분이 철근 콘크리트 형식으로 제작 설치 되어 있다. 초기 구조물 제작시 파손 및 전단, 염해에의 한 콘크리트의 부식에 대한 인식 부족으로 일반적인 색상표시 도장방식으로 마감처리 하여 설치 하였다. 이로 인하여 콘크리트의 파손, 도장부의 탈락으로 인하여 매년 유지보수비용이 투입되고 있는 실정이다. 또한 부식진행 후 현장여건상 보수도장이 취약하고 보수 후에도 내구성 부족(방오수명 2년~3년)으로 지속적인 관리가 필요하다. 그러므로 항로표지의 신규 설치시 강관조 형식의 설계적용이 요구되며 강관조의 가장 큰 취약점인 부식(녹)에 대한 방오방법의 연구가 지속적으로 진행되고 있다. 또한 기 설치된 해상 금속구조물의 경우 보수작업시 장비반입, 작업시간, 작업여건 등이 비말대, 간만대에 따라 변동 하므로 원칙적인 보수가 불가능한 상황에 있다. 그러므로 초기 제작시 부식에 대한 방오도장이 시행 되어야 한다. 기 설치된 콘크리트 구조물 등표는 원칙적인 구조보강 검토 후 염해, 중성화 방지 도장을 시행 하여야 하며 이에 대한 연구를 진행하고 있다.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.28 no.3A
• /
• pp.341-347
• /
• 2008

Among coating systems used for steel bridge coatings on highway such as red lead-pigmented alkyd, chlorinated rubber, waterborne inorganic zinc, inorganic zinc/epoxy/urethane and inorganic zinc/epoxy/fluororesin, evaluation of deterioration degree and prediction of lifetime through regression analysis were carried out for coating systems widely used and grossly degraded. For evaluation of deterioration degree, 75 bridges on highway were selected, and evaluations were carried out according to point offering method regulated by Guideline of maintenance coating for steel bridges used in Korea Expressway Corporation. Lifetime prediction results showed 13.0~13.3 years for the whole nation, 11.8 years for urban and industrial region in the metropolitan area, 13.2 years for rural region except the metropolitan area, 13.5~13.7 years for chlorinated rubber coating systems, and 12.86 years for red lead-pigmented alkyd systems. For prediction of the rest life of coating, we tried to execute parallel translations of standard deterioration curve to current life and deterioration degree for both x and y axes, and it was thought that parallel translation for x axis corresponded to deterioration aspects in actual environment. Maximum and minimum equations were derived from standard deterioration equation by adding and subtracting error values deduced in regression analysis to/from each coefficient in order to establish maintenance coating criteria for overall steel bridges on highway. Whole domain was divided into 8 parts in order to predict the rest life of coating and optimum time of maintenance coating, and maintenance coating criteria for each 8 domains were presented.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.7 no.4
• /
• pp.68-75
• /
• 2008

This paper investigates the correlation between surface roughness and gloss of aluminium sheet painted waterborne paint. One customer criterion of automotive quality is the as-painted appearance of the final products. Especially, the current emphasis on control of surface roughness of sanded aluminium sheet has been prompted by the automotive industry's concern with the as-painted appearance. because the influence of such characteristics on paintability, and painted appearance is important in defining outer panel requirements for automobile. This paper is dedicated primarily to the issue of painted appearance and reviews for improvement of roughness. The conclusions are obtained as follows ; 1) Painted aluminium sheet appearance is strongly affected by surface roughness of base-metal and influenced by sand paper and sanding method. 2) The painted appearance of aluminium sheets was determined and related to surface roughness parameters, combination of sand paper.

• Proceedings of the KIEE Conference
• /
• 2006.07a
• /
• pp.427-428
• /
• 2006

최근 대기환경 악화로 송전용 철탑 도장의 열화가 촉진되어 내후성이 강한 신도료를 송전철탑에 적용이 필요하게 되었다. 도료 제조업체의 신도료로 도장시편을 제작하여 옥외에 폭로후 전문기관에서 성능을 확인하였으며, 이를 토대로 도료의 재질을 실리콘 아크릴우레탄계로 변경하였으며, 철탑용 도료 성능시험 기준을 강화하여 철탑 재도장에 따른 유지보수 비용 절감이 될 수 있도록 개선하였다.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.40 no.1
• /
• pp.77-85
• /
• 2020

Currently, life-cycle cost analysis methods are introduced to maintain large infrastructure facilities in Korea. However, there are not many cases in which maintenance models are applied that reflect conditions such as the location of a facility and its surroundings. In order to establish an appropriate maintenance strategy, a cost prediction, deterioration model, and a decision model reflecting uncertainty should be established. In this study, an economic analysis model was developed for long-term cost planning and management based on user decisions based on maintenance methods and judgment criteria for painting specifications applied to power generation structures. The performance of the paintwork was assessed through the paint deterioration test for the application of the economic analysis model, and the results of the economic analysis according to the applied paint specifications (Urethan, polysiloxane, fluorine) were verified by applying the proposed economic analysis model. In this study, it is believed that the selection of the repair cycle and evaluation methods applied with the development model rather than the performance of the painting can be expected to be used as basic data for the maintenance cycle, even if it is not limited to the painting.

• 한국도로학회:학술대회논문집
• /
• 2010.09a
• /
• pp.347-350
• /
• 2010

• Magazine of the Korea Institute for Structural Maintenance and Inspection
• /
• v.17 no.2
• /
• pp.29-35
• /
• 2013

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.25 no.1
• /
• pp.75-84
• /
• 2021

In this study, to evaluate deterioration propagation life and deterioration curve of the shop painted and field re-painted steel bridges, accelerated corrosion tests were carried out on 4 types of heavy-duty painting systems with different surface treatments. The surface treatments prior to painting were examined by hand tool(SSPC SP-2), power tool(SP-3,) or blast cleaning(SP-10) considering shop painting and field re-painting. The paint deterioration curves for each painting system and surface treatment were evaluated based on corrosion propagation from the initial paint defects. From the test results, the paint deterioration life of shop painted and field re-painted system was evaluated and compared by using corrosivity categories and durability performance evaluation of structural steel. The deterioration propagation life of shop and field paint was estimated in 18 to 21 years and 5.3 to 8.0 years with atmospheric corrosion category C4.

• Magazine of RCR
• /
• v.9 no.1
• /
• pp.34-39
• /
• 2014

• Transactions of the Korean Society of Automotive Engineers
• /
• v.19 no.1
• /
• pp.32-37
• /
• 2011

In car refinishing, the paint film characteristics of clear coat play an important role in appearance quality. Thus, Primarily in this research, the variance of brightness with the change of the thickness of paint film is investigated. Besides, as changing the thickness of paint film, the correlation between surface leveling(which is one of appearance characteristics) is investigated in this research. Throughout this investigation, we come to know that the increase of clear coat paint film thickness leads the improvement of appearance characteristics within specific range of thickness. Furthermore, the fact that too thick paint film does not increase the brightness or appearance characteristic any more is known. The optimum thickness of clear coat film for the best and appearance characteristics is derived from this research and more efficient way of determining optimum thickness of paint film is found. Particularly, haze value and waviness have more influence on vividness than brightness. Throughout all experiments, the appearance characteristics are much better at painted horizontally than vertically. These results are derived due to the facts that to obtain the same paint film thickness at painted vertically with painted horizontally is difficult and the way of vertical painting is different from horizontal painting. Therefore, the improvement of vertical painting and horizontal painting are required.