SMA旧沥青在就地热再生技术中的应用及性能评价

Application and Performance Evaluation of SMA Used Asphalt in on Site Geothermal Regeneration Technology

结合德昌高速公路工程,介绍高速公路沥青路面在养护过程中就地热再生技术的应用,分析SMA旧沥青的老化性能并做出评价。试验数据表明试验路段的矿料级配具有显著差异,主要体现在粗集料通过率;沥青含量平均值为5.24%,极差为0.53%,各路段沥青含量较为接近;旧沥青满足规范对热再生技术中使用老化沥青的规定,但其性能不满足70#改性沥青或者70#沥青的要求,需要加入再生剂。

Combined with Dechang expressway project,this paper introduces the application of geothermal recycling technology in the maintenance process of expressway asphalt pavement,analyzes the aging performance of SMA old asphalt and makes evaluation.The test data show that the mineral aggregate gradation of the test section has significant difference,which is mainly reflected in the coarse aggregate passing rate;the average asphalt content is 5.24%,and the range is 0.53%,and the asphalt content of each section is relatively close;the old asphalt meets the specification of aging asphalt used in thermal recycling technology,but its performance does not meet the requirements of 70#modified asphalt or 70#asphalt,Regenerant needs to be added.