Choose appropriate preventive maintenance measures is the key link to the pavement preventive maintenance successfully and effectively. According to the characteristics of highway asphalt pavement preventive maintenance technology, it summarizes the applicable and inapplicable occasions and application note of existing preventive maintenance measures, puts forward the preventive maintenance technology characteristics and adaptability, sets up the frame of decision-making for the preventive maintenance measures to provide guarantee for successful implementation of effective preventive maintenance.

The elastic modulus of graded gravel material has a paricular characteristics of nonliner. The objective of this study is to discusses the performance of graded gravel roadbase in freeway pavement using KENLAYER computer program. Asphalt Institute (AI) and Shell design methods have been considered using equivalent standard axle load (ESAL) and spectrum of axle methods of incorporating traffic for the design period. Design life in years is determined using fatigue cracking models and rutting models in KENLAYER computer program, which is feasible in the life forecast of graded gravel roadbase. It is beneficial to graded gravel roadbase′s popularization and application in freeway pavement.

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Through the foaming mechanism and foaming effect evaluation, this paper analyzes the production procedure, optimum content and strength of foamed asphalt mixture thoroughly. Combined with the construction process quality control and inspection and acceptance criteria, this paper provides data for reference and theoretical basis for application of cold recycled technology of foamed asphalt to pavement project. Its construction without disrupting traffic, thus shorten the construction period and improve efficiency, which also have advantages such as energy conservation, environment protection and economy. Above all, it is beneficial to foamed asphalt′s popularization and application.

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