For ensuring objectivity and impartiality in budgetary allocations of road pavements, a new index to quantify the rehabilitation demands of a corridor is required. Under the pavement inspection guideline, there are diversified methods of inspecting and the road administrators can make decisions of which one to use by taking into consideration the information content about surface distress and cost of them. In this paper, a method for setting a budget allocation ratio in proportion of each corridor's quantity allocated to state three is proposed. Since a quantity allocated to state three is a condition state rate for state three, which is called “percent defective”, multiplied by a corridor's total quantity, calculation methods of the percent defective for corridors are clarified corresponding to the diversification. Finally, calculation methods' influence on the budget allocation ratio is investigated by a case study dealing with the primary road in the real world.

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 Effective maintenance of concrete pavement requires precise evaluation of load transfer at transverse joint. The load transfer is evaluated from the load transfer efficiency (LTE) that is simply calculated from deflections at loaded and unloaded slabs. In this study, FWD deflections are simulated for various elastic moduli of pavement layers in the degradation process with three dimensional finite element models (3DFEM) to create a database of FWD deflection. If a set of FWD deflections measured at a joint is given, the layer moduli and degradation stage of the joint can be identified from the database. The result of the back-calculation helps engineers to determine a proper rehabilitation measure. The method was validated on a 15 year old concrete pavement. The validation revealed the possibility that the degradation stage of a joint can be detected directly from LTE and measured deflections without the backcalculation. It was also investigated how the degree of joint degradation affects the stress of concrete slab.

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 The authors tried to make a thin section of asphalt concrete by applying dry method to observe the interface of asphalt and aggregate by polarized microscopy. As a result, this method enables to make thin section that does not have damages such as defects of aggregate and asphalt. When the thin section of stripped asphalt concrete are observed by polarizing microscope, stripping, crack of aggregate and mix statement of asphalt mortar in asphalt concrete can be found in order of micro meter.

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