Browsing by Author "Yokota, Hiroshi"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Prediction of Pavement Deterioration Based on FWD Results
    (ASTM International, 2000-01) Maina, James W.; Yokota, Hiroshi; Mfinanga, David A.; Masuda, Shigeji
    Prediction models for pavement deterioration of major roads in Miyazaki Pre-fecture, Japan, using falling weight deflectometer (FWD) data are presented. The models would be incorporated in a pavement management system (PMS), for the prefecture, which is under development. At first, a relation between Japanese maintenance control index (MCI) and cumulative equivalent single axle loads (CESAL) was established. MCI was computed using variables that were automatically measured by a vehicle mounted with laser beam, cameras and profilometers. AASHO performance equation provided the basis for the development of these new models. Strength (deflection) factor was introduced into the coefficient that controls the slope of the performance curve through multiple regression analysis. Given FWD deflection and CESAL, these models could predict the trend of future pavement deterioration. This method increases the range of applicability of FWD data and may complement pavement condition rating systems that provide a measure of current pavement conditions only.
  • Thumbnail Image
    Item
    The Separate Effects of Traffic Loading and Environment on Rutting and Cracking Trends of Asphalt Pavements
    (Eighth International Conference on Asphalt Pavements, 1997) Mfinanga, David A.; Ochiai, Hidetoshi; Yasufuku, Noriyuki; Yokota, Hiroshi
    Road pavements deteriorate with traffic loading and environment but the separate effects of these factors are not yet well defined especially with age or environment. This paper aims at finding the separate effects of these two factors on asphalt pavement rutting and cracking. It is believed that this will lead to better modeling of pavement deterioration by clearly understanding and treating the two factors as separate entities. A methodology was devised to separate the two effects, in which pavement age is used to represent the cyclic effect of environmental forces, and analysis was carried out. Results show how each of these factors influence pavement rutting and cracking and provide a further understanding of the influence of some pavement parameters on pavement rutting.