نتایج جستجو برای: road maintenance
تعداد نتایج: 214886 فیلتر نتایج به سال:
Pavement maintenance and rehabilitation have been neglected in Nigeria for a very long time and has resulted to maintenance backlog. Design agencies in Nigeria still use California Bearing Ratio (CBR), even though the method is outdated. An introduction of Dynamic Cone Penetration Test (DCPT) was pertinent, even though the method is relatively old in some developed countries, it has not gain mu...
Road authorities have confronted problems to maintaining the serviceability of road infrastructure systems by using various traditional methods of contracting. As a solution to these problems, many road authorities have started contracting out road maintenance works to the private sector based on performance measures. This contracting method is named Performance-Based Maintenance Contracting (P...
Winter road maintenance practitioners have expressed a strong interest in obtaining weather and road condition forecasts and treatment recommendations specific to winter road maintenance routes. These user needs led the Federal Highway Administration (FHWA) Office of Transportation Operations Road Weather Management Program to support the development of a prototype winter road Maintenance Decis...
In Northern Europe, Scandinavia and in mountainous areas elsewhere in Europe, a considerable portion of road accidents has adverse weather (e.g. strong winds, snow and ice) as a primary or a contributing cause. In future climate, wind will probably appear as a more serious and frequent threat to road traffic than in present climate. Another consequence of climate change on road traffic is the n...
A condition-based maintenance optimization approach is developed for the road-cracking problem in order to derive optimal maintenance policies that minimize a total discounted maintenance cost. The approach is based on a Markov decision process that takes into account multiple actions with varying effects on future road performance. Maintaining the road consists of adding a new asphalt layer; h...
Preservation of the road assets value in an efficient manner is an important aim for developed road administrations. The task requires accurate road maintenance that is planned in advance. Forecasting road condition in the future is a prerequisite for optimisation of maintenance treatments. In this study two hybrid methods are introduced for forecasting road roughness and rutting. Markovian mod...
The study proposed a maintenance rating program (MRP) in Taiwan which combines the methods of DEcision MAking Trial and Evaluation Laboratory (DEMATEL) and Analytic Network Process (ANP) to evaluate maintenance activities accurately. In the view of the provincial and county roads in Taiwan, DEMATEL was employed to compute the effects between criteria through experts’ interviews and questionnair...
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