旧沥青路面混合料抽提试验研究

Experimental Study on Extraction Test in Old Asphalt Mixture

采用离心分离法对旧沥青路面芯样混合料进行抽提试验，以通过率和分计筛余2项指标为依据对旧沥青路面芯样混合料进行级配分析；在此基础上，提出以分计筛余作为旧沥青路面芯样混合料的抽提试验指标；并依托旧沥青路面加铺改造实体工程，推荐出对旧沥青路面先铣刨后再生利用的加铺层结构方案，对旧沥青路面加铺改造工程具有重要的指导作用和现实意义。

Asphalt content test （centrifugation） applies to test asphalt content in the old asphalt mixture, which can be used to recycle asphalt for evaluating aging properties of asphalt. In this paper, the centrifugation has been used to do extraction test in old asphalt pavement core samples mixture. Based on two index such as the pass rate and the single sieve residue, gradation analysis have been done for old asphalt mixture and the single sieve res- idue has been taken as the extraction test index of old asphalt pavement core samples mixture. Relying on the re- construction project of old asphalt pavement, the scheme of the first milled last recycled overlay structure has been recommended, which plays an important role in the reconstruction project of old asphalt pavement.