花岗岩沥青混合料路用性能  

Road performance of granite asphalt mixture

作　　者：彭余华[1] 刘惠兴 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]云南省公路工程监理咨询公司,云南昆明650021

出　　处：《交通运输工程学报》2010年第2期6-11,共6页Journal of Traffic and Transportation Engineering

基　　金：国家西部交通建设科技项目(200631881221)

摘　　要：采用延长时间的水煮法研究了4种抗剥落剂对改善沥青与花岗岩集料的粘附性能优劣。以花岗岩沥青混合料表面层为研究对象,基于路面水损害目标设计了较小空隙率的花岗岩沥青混合料,进行了掺加美氏、PA-1和不掺加抗剥落剂3种情况下的马歇尔试验、车辙试验、水稳性试验、加速老化试验、浸水肯塔堡飞散试验等。试验结果表明:相对于不掺加的状况,掺加美氏抗剥落剂后,花岗岩沥青混合料的稳定度提高39.8%,动稳定度提高42.1%,残留稳定度提高13%,冻融劈裂比提高16%,飞散损失降低4.4%;掺加PA-1抗剥落剂后,花岗岩沥青混合料的稳定度提高14%,动稳定度提高22.9%,残留稳定度提高8%,冻融劈裂比提高12%,飞散损失降低2.9%;掺加这2种抗剥落剂的沥青混合料加速老化试验后的技术指标均满足规范要求。可见,掺加受热稳定性良好的抗剥落剂是提高花岗岩路用性能的重要保证,且美氏抗剥落剂改善效果优于PA-1。但仅通过2%水泥替换矿粉方法难以全面满足花岗岩沥青混合料路用性能要求。The adhesion between granite aggregate and asphalt was evaluated by extending the boiling time and adding several kinds of anti-stripping agents.Taking the surface layer of granite asphalt mixture as the research objective,minor void volume was designed based on the target of water damage,and some tests including Marshall stability test,wheel rutting test,water stability test,accelerating aging test and Cantabro test were conducted under the conditions of adding MeadWestvaco,PA-1 and no adding anti-stripping agent.Test result shows that contrasted with no adding anti-stripping agent,granite asphalt mixture＇s stability,dynamic stability,residue stability and freeze-thaw splitting rate increase by 39.8%,42.1%,13% and 16% respectively,and its flying shards loss decrease by 4.4% in the condition of adding MeadWestvaco.While granite asphalt mixture＇s stability,dynamic stability,residue stability and freeze-thaw splitting rate increase by 14%,22.9%,8% and 12% respectively,and its flying shard loss decrease by 2.9% when adding PA-1.The technical indices of granite asphalt mixtures after accelerating aging test come up to the specifications when adding two kinds of anti-stripping agents.The study indicates that adding anti-stripping agent with good thermal stability is the key point to improve the road performance of the mixture,and the effect of MeadWestvaco is superior to that of PA-1.The way that mineral powder is replaced by 2% cement cannot fully meet the performance need of granite asphalt mixture.7 tabs,4 figs,15 refs.

关 键 词：路面材料 花岗岩沥青混合料 路用性能 抗剥落剂 

分 类 号：U414.75[交通运输工程—道路与铁道工程]