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预防性养护的关键问题是养护时机的确定。
The critical problem for preventive maintenance is how to confirm the maintenance time.
近年来，我国多个地区开展了预防性养护时机和养护措施的研究。
Many areas in China have studied on the right preventive maintenance time and maintenance measures in recent years.
通过全寿命周期分析方法，提出半刚性沥青路面最合适的养护时机，使所需养护维修费用最少，为道路使用者提供良好的通行环境。
This paper presents right maintenance time of semi-rigid asphalt pavement through life-cycle cost analysis, which could make the least maintenance cost for manager and best surroundings for users.
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