沥青老化对集料粘附性能影响规律及评价方法研究.pdf

第35卷,第6期
公路工程
Vpl. 35 No 6
2010年12月
Highway Engineering
2010
沥青老化对集料粘附性能影响规律
及评价方法研究
聂忆华,戴旭',班钰镇,徐望国
(1.湖南科技大学,湖南湘潭41201;2.龙光集团广贺高速公路项目部,广东深圳518101)
摘要]】采用延时烘箱老化方法对基质沥青和政性沥青进行不同时长的老化,探讨采用水煮前后质量损失
率评价沥青与集料粘附性的可行性,分析了粘附等级和质量损失率指标随沥青老化程度变化的规律,探讨了粘附
等级与质量损失率两种评价指标的相关性。结果表明:随着沥青老化程度加深,沥青与集料的粘附等级下降,水煮
前后质量损失率上升;改性沥青老化后与集料的粘附性能下降幅度较基质沥青小,抗水损能力强;水煮前后质量损
失率与粘附等级有稳定的相关关系,且质量损失率量化了粘附等级的评价过程,测试结果客观性高。
关键词]沥青;老化;粘附性能;粘附等级;质量损失率
[中留分类号]U414.1[文献标识码]A
[文章编号]1674-0610(2010)06-0034-04
Research on Influence Regularities and Evaluating Indicators of
Adhesion Property between Aging Asphalt and Aggregate
NIE Yihua DAI Xu BAN Yuzhen", XU Wangguo
(1. Hunan University of Science and Technology, School of Civil Engineering, Xiangtan, Hunan 411201
China; 2. Logan Group, Guang-he Express Highway Subject, Shenzhen, Guangdong 518101, China)
Abstract] In the paper, the method of prolong aging time in oven was adopted to get different ag
ing degree asphalt such as base asphalt and modified asphalt. Firstly, The mass loss percent during wa-
ter cooking and adhesion grade were tested to evaluate the adhesion property. Then, the influence regu-
larities of adhesion property was analyzed due to asphalt aging. Finally, the relativity between mass loss
percent and adhesion grade was carried out. It is found that adhesion grade is falling, and mass loss per
cent is increasing while asphalt aging degree is growing. And the study result also proves that modified
asphalt has better adhesion property than base asphalt. The two evaluation indicators has stabilization rel-
ativity. The mass loss percent is advised to use to evaluate adhesion property for better objectibity
Key words] asphalt; aging; adhesion aproperty; adhesion grade; mass loss percent
沥青路面在运输、施工和使用过程中,会受各种得进一步探讨。为此,本文主要对沥青进行不同程
自然因素和人为的反复加热作用而不可避免的逐渐度老化,测试老化后沥青与集料的粘附性能,并分析
老化,沥青老化会引起沥青粘度增大、变脆、可塑性沥青老化对集料粘附性能的影响规律,探讨采用水
和变形能力降低,沥青与集料的粘附性能下降,抗水煮前后质量损失率评价粘附性能的可行性,通过研
损能力变弱,从而导致路面产生裂缝、松散、坑洞等究质量损失率与粘附等级的相关性,推荐采用水煮
病害,加速路用性能降低,使用寿命缩短。然而在工前后质量损失率替代粘附等级评价粘附性能,为提
程实践中,国内外学者将研究重点多放在沥青老化高沥青与集料粘附性能评价质量提供依据。
后自身性能的衰变上,而对于沥青老化后抗水损能
1粘附理论
力变化研究重视不够,同时中国现行规范中采用
评价沥青抗水损能力的水煮试验方法的科学性也值
根据经典的湿润理论,当集料表面处于潮湿状
收稿日期]2010-04-2
基金项目]湖南省教育厅资助项目(09C395);湖南科技大学博土启动基金(E50910)
作者简介]聂忆华(1979-),女,湖北汉川人,博士,讲师,主要研究方向为路面结构与材料。