乳化沥青冷再生混合料二次热压实室内试验模拟与路用性能增幅量化  

Research on Laboratory Simulation and Road Performance Enhancement Quantification of the Secondary Thermal Compaction of Emulsified Asphalt Cold Recycled Mixture

作　　者：肖刘路 黄晚清 曹明明 XIAO Liu-lu;HUANG Wan-qing;CAO Ming-ming(Hefei Municipal Design and Research Institute Co.Ltd.,Hefei 230041,China;Sichuan Communication Surveying and Design Institute Co.Ltd.,Chengdu 610041,China)

机构地区：[1]合肥市市政设计研究总院有限公司,合肥市230041 [2]四川省交通勘察设计研究院有限公司,成都市610041

出　　处：《公路》2022年第7期80-87,共8页Highway

基　　金：四川省交通运输科技项目,项目编号2019-ZL-13;四川省科技计划项目(重点研发项目),项目编号2020YFS0362。

摘　　要：为模拟乳化沥青冷再生混合料(EACRM)的二次热压实过程,以川九路改建工程EACRM下面层+SBS改性沥青AC-13C上面层的路面结构为例,基于现场钻芯实测空隙率,提出两种EACRM二次热压实的室内成型方法,即二次轮辗热压实法和二次SGC热压实法;再采用车辙试验、低温弯曲试验和浸水飞散试验,量化EACRM经二次热压实后高、低温性能和水稳定性能的增幅。试验结果表明,EACRM轮碾24次结束养生后再上覆SBS AC-13C混合料轮碾36次,或经SGC压实65次结束养生后再上覆SBS AC-13C混合料SGC压实100次,此二者与实际施工的压实效果相当。EACRM经二次热压实后,空隙率从12%降低至9.9%;高温车辙动稳定度提升超30%;在低温抗裂性能方面抗弯拉强度和弯曲应变能密度增幅超20%,最大弯拉应变的增幅较小,仅为5%;浸水飞散损失降幅超50%;并且,各项性能指标均较二次热压实前更加稳定。In order to simulate the secondary thermal compaction process of emulsified asphalt cold recycled mixture(EACRM), the pavement structure of the subsurface of EACRM + the upper layer of SBS modified asphalt AC-13 C for the Chuanzhusi-Jiuzhaigou Highway is taken as an example. Based on the measured porosity of on-site core drilling, two laboratory molding methods for EACRM secondary thermal compaction are proposed, namely secondary wheel rolling thermal compaction method and secondary SGC thermal compaction method. Then, rutting test, low temperature bending test and water immersion flying test are carried out to evaluate the high and low temperature performance and water stability of EACRM’s secondary thermal compaction. The results show that:(1) after EACRM wheel rolling for 24 times and finish curing, overlay the SBS AC-13 C mixture and wheel rolling for 36 times;or after SGC for 65 times and finish curing, overlay the SBS AC-13 C mixture and rolling by SGC for 100 times. The two methods have the same effect as the actual construction rolling.(2) After the secondary thermal compaction of EACRM, the porosity decreases from 12% to 9.9%;the dynamic stability of high-temperature rutting increases by more than 30%;in terms of low-temperature crack resistance, the bending tensile strength and bending strain energy density increase by more than 20%, but the increase of the maximum flexural strain is small, only 5%;the water-dispersion loss decreases by more than 50%;and all the indicators are more stable than those before the secondary thermal compaction.

关 键 词：道路工程 乳化沥青冷再生混合料 二次热压实室内试验模拟 现场实测空隙率 二次轮碾热压实法 二次SGC热压实法 路用性能增幅量化 

分 类 号：U416.26:TU535[交通运输工程—道路与铁道工程]