ABSTRACT
In Japan, a road surface characteristics measuring vehicle has been used for pavement inspection since the 1970s. At the present time, about 60 road surface characteristics measuring vehicles are used in Japan. There are three inspection items: cracks, rutting, and roughness. Cracks are evaluated by the ratio of the area of cracks with a width of 1 mm or more, but the length and width are not used. FWD is used to evaluate the structure of cracked areas. However, the relationship between these inspection items and FWD has not been clarified. Therefore, in order to manage the pavement efficiently, a new method for evaluating cracks was examined. Using a measuring vehicle that can acquire cracks with a width of less than 1 mm, the shape of the cracks were arranged. The shape of the crack focused on the width, intersection, length, and area. The measurement was performed in four sections having different types of cracks. As a result, there was no relationship between the conventional crack evaluation method and FWD, but a correlation was confirmed between the crack length and the FWD deflection.
