击实次数对双层功能性沥青混合料稳定性的影响  

Effect of Compaction Number on Stability of Two-layer Functional Asphalt Mixture

作　　者：张海涛[1] 袁梦 ZHANG Hai-tao;YUAN Meng(College of Civil Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学土木工程学院,哈尔滨150040

出　　处：《科学技术与工程》2020年第21期8779-8784,共6页Science Technology and Engineering

基　　金：黑龙江省交通运输厅重点项目(JTT-2016)。

摘　　要：在目前现有的单层沥青混合料及单层功能性沥青混合料的基础上,设计了一种上层OGFC沥青混合料与下层AC沥青混合料组合的双层沥青混合料,该种沥青混合料除了保留原有OGFC的功能特性外,又具有较好的力学性能。在针对双层沥青混合料马歇尔试件击实制作成型的基础上,考虑双层沥青混合料的强度与功能性等问题,研究采用不同击实次数组合(50×50、60×60、75×75、50×75、60×75)的击实形式,分别在25、60℃条件下对不同击实次数组合下的试件进行了马歇尔试验,以此来初步验证双层沥青混合料稳定性与击实次数组合之间的关系。同时研究基于数据拟合分析对不同击实次数组合下混合料的稳定性进行分析。研究表明:在不同击实次数组合下,双层功能性沥青混合料的密度、空隙率符合与击实次数的一般规律,试件的密度随着击实次数的增加逐渐增大,试件的空隙率随着击实次数的增加逐渐减小。此外,随着击实次数的增加双层功能性沥青混合料两层间层间连接逐渐密实、层间连接效果更好,所测得的稳定度随着击实次数的增加而逐渐增大。Based on the existing single-layer asphalt mixture and single-layer functional asphalt mixture,a double-layer asphalt mixture was designed with upper OGFC(open graded friction course)asphalt mixture and lower AC(asphalt concrete)asphalt mixture.In addition to retaining the functional properties of the original OGFC,the asphalt mixture had good mechanical properties.First,the Marshall Test pieces of the double-layer asphalt mixture were made and mechanically tested considering the strength and functionality in five different combinations of compaction times.The five compact combinations were 50×50,60×60,75×75,50×75 and 60×75.Secondly,the test pieces were tested at 25℃and 60℃to reveal the relationship between the stability of the layer asphalt mixture and the combination of the compaction times.Meanwhile,by data fitting analysis,the stability of the mixture under the different combination schemes was determined.The results show that under different combination of compaction times,the relationship between density,void ratio,and compaction times of double-layer functional asphalt mixture conform to the general mechanical rules.The density of the test piece increases with the increase of the number of compaction times.The void ratio gradually decreases as the number of times of compaction increased.In addition,with the increase of the number of compaction times,the interlayer connection between the two layers of the functional asphalt mixture is gradually compacted,the interlayer connection effect is better.the measured stability is gradually increasing by the number the rising of of compactions.

关 键 词：功能性沥青混合料 击实次数 马歇尔试验 稳定性 

分 类 号：U416[交通运输工程—道路与铁道工程]