宁夏地区高模量天然沥青混合料路用性能研究  

Road Performance of High-modulus Natural Asphalt Mixtures in Ningxia Region

作　　者：刘立朋 马世俊 陈维斌 LIU Lipeng;MA Shijun;CHEN Weibin(Ningxia Communications Construction Co.,Ltd.,Yinchuan,Ningxia 750001,China;Ningxia Haiping Expressway Management Co.,Ltd.,Zhongwei,Ningxia 755200,China)

机构地区：[1]宁夏交通建设股份有限公司,宁夏银川750001 [2]宁夏海平高速公路管理有限公司,宁夏中卫755200

出　　处：《山西交通科技》2024年第5期7-12,共6页Shanxi Science & Technology of Transportation

基　　金：宁夏回族自治区交通运输厅科技项目(202200192)。

摘　　要：为解决重载交通路段严重的路面车辙病害问题,依托宁夏海平高速公路耐久性沥青路面试验段,对高模量天然沥青混合料的路用性能进行了研究。首先选取了HMB-W型的高模量天然沥青作为研究对象,采用马歇尔设计方法对EME-20的配合比进行设计,分析其物理性能指标,并通过室内试验从高温、低温、水稳定性及疲劳性能对比分析了其与SBS-AC-20和壳牌基质AC-20的路用性能差异,最后铺筑了试验段验证了其适用性。研究结果表明:EME-20的油石比和稳定度显著高于SBS-AC-20和壳牌AC-20;EME-20的动稳定度、残留稳定度、冻融劈裂强度和疲劳寿命分别比SBS-AC-20高27.5%、6.47%、2.82%和27.3%,分别比壳牌基质AC-20高122.3%、35.4%、7.63%和40.3%,但EME-20的最大弯曲应变比SBS-AC-20低10%,比壳牌基质AC-20高11.04%;同时,EME-20试验段路面的压实度和抗渗性能均满足设计要求。To solve the severe pavement rutting diseases in heavy transportation road sections,this paper studied the road performance of the high-modulus natural asphalt mixtures based on the durable asphalt pavement experimental section in Ningxia Haiping Expressway.Selecting the HMB-W high-modulus natural asphalt as the study objective,the mix proportion of EME-20 was designed with the Marshall method to analyze the physical properties.The differences in the road performance between EME-20,SBS-AC-20,and the Shell matrix asphalt AC-20 were compared using indoor tests of high temperature,low temperature,water stability,and fatigue behavior.Finally,the applicability of EME-20 was verified by paving the experimental section.The results showed that the asphalt-aggregate ratio and stability of EME-20 were significantly higher than those of SBS-AC-20 and Shell AC-20.The dynamic stability,residual stability,freeze-thaw splitting strength,and fatigue life of EME-20 were higher than those of SBS-AC-20 by 27.5%,6.47%,2.82%,and 27.3%,and higher than those of Shell AC-20 by 122.3%,35.4%,7.63%,and 40.3%,respectively.However,the maximum bending strain of EME-20 was lower than that of SBS-AC-20 by 10%and higher than that of Shell AC-20 by 11.04%.Besides,the EME-20 experimental road section's compaction and impermeability met the specification requirements.

关 键 词：高模量天然沥青 SBS改性沥青 壳牌基质沥青 路用性能 

分 类 号：U414.75[交通运输工程—道路与铁道工程]