上面层废旧SMA再生利用配合比设计及性能评价

Proportioning Design and Performance Evaluation of Upper Waste SMA Asphalt Mixture

目前中国大部分公路及城市道路已逐渐进入养护或大修期,在此过程中,上面层铣刨工作将产生大量的废旧沥青混合料。特别是对于上面层常用的SMA旧料,由于其造价偏高、性能优异等特点,弃之可惜。因此,研究废旧SMA再生技术具有较大经济和实用价值。采用实际道路大修工程中铣刨的上面层SMA-13废旧沥青混合料,抽提废旧沥青并测试其性能衰减情况,确定了再生剂掺量;以20%旧料掺配率为例,对不同油石比下路用性能结果进行分析,确定了此条件下最佳油石比;最后,通过逐步提高旧料掺配率,判断混合料各路用性能在满足规范要求的最大旧料掺配率。

At present,most of China s highways and urban roads have gradually entered the maintenance or overhaul period.In the process,the upper layer milling work will produce a large amount of waste asphalt mixture.Especially for the SMA old materials commonly used in the upper layer,due to its high cost and excellent performance,it is a pity to abandon it.Therefore,research on waste SMA regeneration technology has strong economic and practical value.In this paper,the upper layer of SMA-13 waste asphalt mixture milled in the actual road overhaul project is used to extract the waste asphalt and test its performance degradation,and determine the amount of regenerant;the ratio of 20%old material blending ratio is The results of road performance under different oil-stone ratios were analyzed to determine the best oil-stone ratio under this condition.Finally,by gradually increasing the blending ratio of the old materials,the maximum old material blending ratio of the mixed materials in meeting the requirements of the specification was judged.