| dc.description.abstract | With the society of Taiwan develops rapidly, the roads develop rapidly, too. In the condition that all kinds of roads in Taiwan developed well, the road projects changed from the roads are going up to the roads are maintained and managed. The maintaining and managing department’s business changes form checked before acceptance to surveyed the pavement condition. It’s helpful to maintain and manage all kinds of cracks and conditions about the pavement and provide high service quality to service the public. Surveying Pavement Condition Index is the most important thing in the pavement condition surveys by the standard of ASTM D 6433-99. It’s main surveying completeness of the pavement structure and the condition of the surface service quality to provide objective and reasonable foundation for the policies of maintaining and managing the pavement.
According to the standard of ASTM D 6433-99, the most traditional way of the PCI surveys is that PCI is recorded by writing and determination the condition through visual surveys, and it needs quantities of manpower and time to survey. Because the defects could be offset by the progress of computer, we often use computers to assist in the PCI surveys. We also use digital camera’s characteristic to assist in collecting pavement condition that show the cracks of roads. We use GPS to provide the coordinate of the crack of the road.
Because the way of the PCI surveys is through visual surveys, the errors of the PCI surveys’ result occur by grader’s subject. We used analysis of variance (ANOVA) to analyze the relation between the results of different graders, roads and the ways to the PCI surveys. And we use sensibility analysis to all kinds of cracks in the standard of the PCI surveys to get the most important factor that effected upon the result of the PCI surveys. Finally, we decrease the events of the standard of ASTM D 6433-99. What we estimated for the five events of the PCI surveys of the countryside roads in Taoyuan country is the opening and potholes, patching and utility cut patching, alligator cracking, longitudinal and transverse cracking, vary of the pavement.
We estimated for the asphalt pavement of the freeway, the roads of the province, the roads of the county, the roads of the country, the roads of the urban. Because the maintaining and managing about the asphalt pavement of the freeway and the roads of the province was easier then the roads of the county, the roads of the country, the roads of the urban, the cracks can be dealt with soon. The asphalt pavement of the freeway and the roads of the province that the condition grade was good only was occurred cracks of the weathering and raveling, because the weather in Taiwan was hot and rainy. We survey one more event of the crack that is the weathering and raveling on the asphalt pavement of the freeway and the roads of the province. | en_US |