沥青温拌技术分类及温拌效果的试验评价方法  

Technique Types of Warm Mix Asphalt and Experimental Methods to Evaluate the Warm Effect

作　　者：延西利[1] 郑涛 蒋双全 李卫成 YAN Xili;ZHENG Tao;JIANG Shuangquan;LI Weicheng(School of Highway,Chang’an University,Xi’an 710064,China;Sichuan Expressway Construction&Development Group Co.,Ltd.,Chengdu 610041,China;Sichuan Road and Bridge Construction Group Co.,Ltd.,Chengdu 610041,China;Ankang Transportation Investment Construction and Development Group Co.,Ltd.,Ankang 725000,Shaanxi,China)

机构地区：[1]长安大学公路学院,西安710064 [2]四川高速公路建设开发集团有限公司,成都610041 [3]四川公路桥梁建设集团有限公司,成都610041 [4]安康市交通建设投资集团有限公司,陕西安康725000

出　　处：《材料导报》2024年第4期80-87,共8页Materials Reports

基　　金：陕西省科技项目(2020GY-304);四川路桥项目(KY2021srbg-10-12);安康市科技项目(AK2021-GY-13)。

摘　　要：沥青温拌技术日益广泛应用于路面工程,为了定量评价温拌沥青混合料在拌和生产过程中的温拌效果,提供试验评价方法,本研究自主开发了一种沥青混合料变速拌和试验装置,采用70^(#)基质和SBS改性两种沥青、自主研发的一种表面活性剂型沥青温拌剂(取名为Alube)和一种有机降黏型沥青温拌剂(取名为ACMP),以市场成熟产品Evotherm为参照,分别制备了温拌沥青及其AC-13C型混合料,测试了不同沥青和温拌沥青的三大指标、布氏黏度和动态剪切流变指标,分析了沥青的黏温曲线特性,通过混合料的变温击实试验和变速拌和试验,研究了沥青混合料的压实特性和拌和流动特性,提出了沥青混合料的拌和流动模型。研究结果表明,有机降黏型温拌剂减小了沥青的黏度,增大了沥青的流动性,改变了沥青的技术性能,如针入度、延度、相位角等增大,软化点、布氏黏度等减小,而表面活性剂型温拌剂不改变沥青的基本技术性能;黏温曲线法仅可表征有机降黏型温拌沥青的温度变化,等黏温度降低约9℃,变温击实法和变速拌和法则可以同时表征两大类温拌剂的温拌效果;沥青混合料的拌和流动性服从宾汉黏塑性模型,从流变理论上解答了混合料的拌和流动性及和易性,推荐采用变速拌和试验来评价温拌沥青混合料的温拌效果;综合考察现有沥青温拌技术可知,在常用温拌剂掺量下,温拌沥青的生产拌和温度可比热拌沥青混合料低20~30℃,符合常规认识。The warm mix asphalt(WMA)technique has been widely used in pavement engineering.In order to quantitatively evaluate effects of WMA additives on the asphalt mixture mixing process,a variable speed mixing test device for experimental evaluation of asphalt mixture was developed in this study.Newly developed WMA chemical additive(named Alube)and organic additive(named ACMP),and commercially available Evotherm WMA additive,will be used to prepare warm-mixed asphalt binders and the corresponding AC-13C asphalt mixtures.Both penetration grade 70#and SBS modified asphalt binders will be used as the base asphalt for WMA.By evaluating penetration grade,softening point,ductility,Brookfield viscosity and dynamic shear rheological parameters of 70^(#)pen asphalt binder,SBS modified asphalt binder,and three warm-mixed asphalt binders,the viscosity-temperature curve characteristics were evaluated.Based on the compaction test with variable temperatures and mixing test with variable speeds,the compaction characteristic and the mixing flowability of asphalt mixtures were evaluated.The mixing flo-wability model was also developed.The results indicated that organic type WMA additive can reduce the viscosity of asphalt binders,which will increase the flowability of asphalt mixtures.In turn,penetration,ductility,and phase angle of asphalt binders will be increased,while the softening point and Brookfield viscosity will be decreased.On the other hand,the chemical type WMA additive did not change the basic technical properties of asphalt binders.The viscosity-temperature curve can only characterize the temperature variation during mixing process for asphalt mixtures with organic type WMA additive,and the equal-viscosity temperature can be reduced by 9℃.The compaction method with variable temperatures and mixing method with variable speeds can simultaneously characterize the effects of both types of WMA additives on mixing process.The mixing flowability of the asphalt mixture can be described by the Bingham’s model,which can well exp

关 键 词：道路工程 沥青混合料 沥青温拌技术 试验评价 变速拌和试验 宾汉模型 

分 类 号：U414[交通运输工程—道路与铁道工程]