In order to determine preventive maintenance timing,a new model is made based on pavement condition index & roughness index(PCI-IRI) function model,by which the maximum accelerating speed of pavement condition index(PCI) can be found,and then preventive maintenance timing can be identified at this point.

Integrative evaluation index system for preventive maintenance timing of asphalt pavement;

Application of synchronous chip seal technique to thepreventive maintenance of highway;

Introduction of the preventive maintenance of the asphalt pavement of the expressway in Guangdong;

According to the results of investigating of a highway condition in Guangdong Provence,the process of selecting preventive maintenance treatments,the dividing index and method of maintenance section are studied.