SBS改性高RAP掺量热再生混合料温度敏感性及抗裂性能研究  

Study the Temperature Sensitivity and Crack Resistance of SBS Modified High RAP Content Hot Recycled Mixture

作　　者：霍廷军 

机构地区：[1]呼伦贝尔市公路勘测规划设计有限公司,内蒙古呼伦贝尔021000

出　　处：《公路工程》2015年第5期129-133,169,共6页Highway Engineering

基　　金：国家自然科学基金项目(51108150)

摘　　要：热再生混合料RAP回收利用率低、抗裂性能不足是制约其适用性的关键技术指标,提出采用SBS改性沥青生产厂拌热再生混合料,并基于车辙试验、小梁弯曲试验、四分点加载控制应变疲劳试验研究了不同RAP掺量热再生混合料的温度敏感性、低温抗裂性抗疲劳开裂性能。试验结果表明:相比SBS改性沥青混合料,SBS改性热再生混合料具有较好的抗永久变形能力,且随着RAP掺量增大改性热再生混合料温度敏感性降低;随着RAP掺量增加,改性热再生混合料弯拉应变、单位体积破坏应变能均呈线性减小,RAP掺量小于40%时,增大RAP掺量对改性热再生混合料低温抗裂性影响不大,RAP掺量超过50%时,SBS改性改性热再生混合料的疲劳性能显著降低,低温抗裂性和抗疲劳耐久性仍是制约改性热再生混合料RAP掺量的主要因素。The RAP recycling utilization is low and the crack resistance is a key technology that limit the applicability of the indicators,In article using the SBS modified asphalt plant mix hot recycled mixture,and based on the rutting test,the trabecular bending test,four point load control strain fatigue test to study the temperature sensitivity,low temperature crack resistance,resistance to fatigue cracking performance of hot recycled mixture under different RAP content.The results show that：compared with SBS modified asphalt mixture,the SBS modification of hot recycled mixture has good ability to resist permanent deformation,and the with the increase of RAP dosage,mixture temperature reduced susceptibility;With the increase of dosage of RAP,modified hotrecycled mixture flexural strain and damage strain energy per unit volume is linearly decreases,and RAP content less than 40%,increasing the RAP content of modified hot regeneration mixture has a little influence on the low temperature crack resistance, RAP content exceeds 50%,the fatigue property of modified SBS modified hot regeneration mixture significantly reduced,low temperature crack resistance and fatigue resistance durability is still restricted modified the main factors of hot recycled mixture RAP content.

关 键 词：路面工程 热再生混合料 高温稳定性 低温抗裂性 抗疲劳开裂性能 

分 类 号：U414.1[交通运输工程—道路与铁道工程]