中文摘要：

为确定路面最佳预养护时间，将物元分析理论引入该领域，根据路面使用性能的衰变规律，以预养护方案的费用效益分析为基础，建立了确定最佳预养护时间的物元模型。该模型通过关联函数，同时考虑预养护费用、效益等指标，以综合关联度的大小确定最佳预养护时间，实例分析表明，所建立的物元模型能较全面地反映路面状况对预养护实施时机的影响，可获得较准确的最佳预养护时机。研究结果为确定最佳预养护时间提供了一种有效的方法，为制定科学、合理的预养护计划奠定了基础。

英文摘要：

The theory of matter-element analysis was introduced into the field of pavement preservation for determining the optimal time of preventive maintenance treatment application. According to the deterioration-law of pavement performance, a matter-element model for determining the optimal time of pavement preventive maintenance treatment application was established on the ground of cost-effectiveness analysis. The model takes factors such as the cost of treatment and benefits of different indicators which were used to evaluate the performance of pavement into account by applying the relation function of extension sets. The optimal time of pavement preventive maintenance treatment application is determined by the synthetically relation-degree which was calculated by the model. An example indicates that the model can reflect the effect of comprehensive state of pavement condition on the optimal time more perfectly and give better result for preventive maintenance program. The result provides decision makers with a scientific support in their decision-making.