PURPOSES : This study is aimed to economic analysis of the ferronickel slag pavement method carried out to suggest the necessity of developing ferronickel slag pavement technology. METHODS : A life cycle cost analysis of the application of the Ferronickel Slag pavement method and the cutting + overlay pavement method was performed to compare the economic indicators and greenhouse gas emissions for each pavement method. RESULTS : As a result of the analysis, regardless of the Ferronickel Slag mixing rate, if the common performance of the Ferronickel Slag pavement method is the same or superior to the existing pavement method, it is more economical than the existing pavement method. Furthermore, the lower the maintenance cost of the Ferronickel Slag pavement method, the higher the economic feasibility due to the high Ferronickel Slag mixing rate. Greenhouse gas emissions can be reduced from at least 9% to up to 53% through the application of the Ferronickel Slag pavement method, except for some scenario analysis results. CONCLUSIONS : This study provided that the Ferronickel Slag pavement method was superior to the existing pavement method in terms of economic and environmental aspects. Therefore, it was found that the objective justification of developing road pavement technology using Ferronickel Slag was secured.

PURPOSES : So far, aged cement concrete pavement on express highways has been rehabilitated mainly with asphalt concrete inlay. However, potholes were the major problem, and they shortened the life of the inlay mainly owing to the poor drainage of water once it infiltrated the interface of the concrete and asphalt. The purpose of this study is to compare the performance and economic efficiency of asphalt overlay and inlayMETHODS: Overlay and inlay were compared through accelerated pavement testing, and a life-cycle cost analysis was conducted in this study using the CA4PRS program.RESULTS and CONCLUSIONS : It was found from accelerated pavement testing that the overlay exhibited reflective crack resistance that was more than twice as effective as that of inlay. The total cost (construction cost + user cost) within the analysis period (20 years) of the overlay was 37% lower than that of the inlay.

PURPOSES: Concrete pavement has been used in the construction of the Jungbu expressway in 1987. More than 60% of the pavement on the expressway is currently made of concrete, but most has been used far beyond their design life. Pavement life has been extended through routine maintenance or overlay. However, the structural capacity of the pavement has reached its limit, and extensive rehabilitation/reconstruction with long time traffic blocking should be considered. The three following issues on concrete rehabilitation/reconstruction will be discussed: (1) economic comparison of asphalt inlay and asphalt overlay, (2) economic comparison preventive overlay on a section which is currently good and routine overlay on the section which will be poor, and (3) economic analysis of early-strength concrete when it is used in concrete reconstruction. METHODS: First, various life cycle cost analysis tools were compared, and the proper tool for the extensive rehabilitation/reconstruction was selected. Second, a sensitivity analysis of the selected tool was performed to find the influential input variables, which should be carefully selected in the analysis. Third, three case studies, which can be issues in the rehabilitation/reconstruction of the expressway concrete pavement in Korea, were performed. RESULTS: Asphalt overlay without milling the deteriorated concrete showed 18~25% lower life cycle cost than the current asphalt inlay with milling. The good current preventive overlay on the section was economically justified within the scope of this study. The construction cost limit of the early strength concrete was suggested to be economical for 1, 3, and 7 days of construction alternative opening. CONCLUSIONS: CA4PRS was a viable tool for comparing various rehabilitation/reconstruction issue alternatives. Several concrete issues associated with the rehabilitation/reconstruction of the deteriorated concrete pavement were discussed as mentioned above.

This study was carried out to evaluate the Life Cycle Cost(LCC) of four types of BIPV(Building Integrated Photovoltaic) systems -Glass plus Granite, Crystalline BIPV, Crystalline BIPV + Glass plus Granite and See through Amorphous BIPV -which were vertically installed to generate the same capacity(2kW) and the same area. Initial investment costs, cost savings and maintenance costs had been predicted during the period of analysing the LCC of four types of BIPV(Building Integrated Photovoltaic) systems installed for the purpose of evaluating the LCC. In case of cost savings, it had been analyzed by measuring the amount of electric power generated, reduction in lighting load and heat & cooling loads through simulation. From this analysis, it was predicted that the See-through amorphous BIPV offering cost saving advantages demonstrated the economical efficiency similar to the Glass plus Granite when it is backed by more than 20 years of durability.

본 논문은 교량의 예방적 유지관리 효과를 생애주기비용 절감 측면에서 분석 하였다. 예방적 유지관리는 현재 실시되고 있는 대응 적 유지관리 전략과 대비 되는 유지관리 전략으로 교량의 열화지연을 통해 궁극적으로는 교량의 사용수명을 연장 시키며 생애주기비용을 절 감시키는 유지관리 전략이다. 이러한 예방적 유지관리 효과를 분석하기 위해 교량의 공용연수에 따른 건전도 점수 변화 모델과 FHWA 자료를 바탕으로 한 국내 고속도로 교량의 건전도 점수에 따른 보수·보강 비용 모델을 제시 하였다. 제시한 복수의 모델과 국내외 참고 문헌을 바탕으 로 제안된 예방적 유지관리 항목(청소와 도장)의 비용과 주기를 활용하여 사용수명 100년까지의 표준교량(1,730 m2/교량) 당 생애주기 비용과 향후 20년간의 고속도로 총 유지관리 비용을 산정 하였다. 분석 결과 100년간 예방적 유지관리 활동으로 인해 교량 당 5억원의 절감효과를 볼 수 있으며 현재 예방적 유지관리 활동을 실시할 경우 20년 후(2035년)에는 총 1,837억원, 즉 연간 약 92억원의 비용 절감효과를 볼 수 있는 것으 로 분석 되었다.

산업의 발달 및 도시화에 따라 도시에 인구밀도가 높아지고 교통수단이 증가됨에 따라 도로 교통 소음과 관련된 피해가 해마다 급증하고 있는 추세이다. 최근에는 도로와 인접한 인구 밀집 지역인 주거지역, 학교, 병원 등에서 각종 소음에 대한 문제가 지속적으로 발생되고 있는 것으로 조사되었으며 환경분쟁위원회의 발표에 따르면 2014년까지의 환경분쟁 중 약 80%가 소음관련 문제로 해결책이 시급함을 알 수 있다. 본 연구는 복층 저소음 아스팔트 콘크리트 포장의 소음 저감효과 및 경제성에 관한 포스터이다. 본 연구에서는 콘크리트 포장의 시공 전, 후의 5분 등가소음도 측정을 실시하여 일반 밀입도 아스팔트 콘크리트 포장을 시공하였을 때와 복층 저소음 아스팔트를 시공하였을 때의 도로교통 소음 저감량을 비교하였다. 측정된 5분 등가 소음은 소음 예측 프로그램의 변수로 사용하여 복층 저소음 아스팔트 콘크리트 포장을 실시한 지역의 아파트의 15층 전체에 대한 도로교통 소음을 예측 하여 경제성 분석의 기초자료로 사용하였다. 소음 예측 결과를 바탕으로 소음 편익 비용을 산정하였으며 복층 저소음 아스팔트 콘크리트 포장과 일반 밀입도 아스팔트 콘크리트 포장의 생애주기 비용을 비교 분석하였다.

In this study, a bridge maintenance system is developed to generate performance based maintenance strategy by considering the life cycle cost(LCC). And it is proposed that the concept of generally annual maintenance are practically and easily used to perform LCC analysis. Some of generally annual maintenance data are suggested through existing data analysis due to the proposed concept and LCC analysis of by a real bridge structures is preformed by comparison with a current approach. This paper presents the development of bridge maintenance strategy and can be utilized as an efficient tool to provide the best economical bridge maintenance scenario corresponding to the various constraints and requirements of bridge agency.

This study mainly focuses on presenting a rational procedure of assessing target reliability level of nuclear containment. The target reliability level can be obtained by considering LCC(Life Cycle Cost) of damage and operation. The LCC evaluation results in the different environmental situations. It is verified that this deviation of LCC can be adjusted by selecting the proper initial target reliability. In addition, slight increase of initial target reliability for the nuclear containment aiming a longer service life, therefore, the total expected loss during the extended service years can be maintained in the same level as the total loss expected in the 20-year service life for the existing containment structures.

This paper presents the results of a life-cycle cost (LCC) analysis to select an efficient maintenance action for a deteriorated waterfront structure. Three different maintenance actions, a routine maintenance and two types of rehabilitation methods, were assumed and the corresponding the LCCs were calculated using a LC activity profile. The results of the analysis indicate that the LCC analysis can be effectively used to examine the maintenance alternative actions during the decision making process.