高RAP掺量厂拌温再生SMA-16混合料耐久性试验研究  

Study on Durability of Plant Warm Reclaimed SMA-16 with High Proportion of RAP Content

作　　者：方磊[1] 

机构地区：[1]湖南城建职业技术学院,湖南湘潭411101

出　　处：《公路工程》2016年第4期237-241,296,共6页Highway Engineering

基　　金：国家自然基金项目(511784795);2013年湖南省教育厅科学研究项目(13C101)

摘　　要：为了解决热再生旧料加热温度过高碳化、送料通道堵塞、RAP掺量不高,并充分利用SMA路面的残余强度,提高路面结构的长期使用性能。进行了再生SMA—16混合料路用性能研究和试验路铺筑,基于车辙、低温弯曲、冻断、浸水马歇尔、冻融劈裂和四分点加载疲劳试验研究了30%、40%、50%RAP掺量的温再生SMA混合料路用性能,探讨了废旧SMA沥青路面材料高效温拌再生技术的可行性。试验结果表明,随着RAP掺量增大,再生SMA混合料高温稳定性提高,而低温抗裂性和抗疲劳耐久性随RAP掺量增大而降低,低温抗裂性是制约增大RAP掺量的技术瓶颈。RAP掺量小于30%时,再生SMA混合料的各项路用性能均满足现行施工规范技术要求,掺加30%再生料后SMA混合料疲劳性能在各应变水平下降低幅度较小,但RAP掺量达到50%后SMA混合料疲劳寿命下降较为显著。室内试验及工程应用结果表明,温拌再生SMA改性沥青混合料可用于表面层,废旧SMA沥青路面材料高效再生技术是可行的,其经济效益和社会效益显著。In order to solve the problem of old material high temperature carbonization, feeding channel blockage, RAP content is less than 30% and make full use of the residual strength of SMA road mixture, improve the long-term performance of the pavement structure. This article researched on road performance and test road paving of SMA-16 warm reclaimed mixture with different RAP content. Based on rutting, low temperature bending, frozen, Marshall immersion, freeze-thaw splitting and quartile load- ing fatigue test to study the dosage of 30%, 40%, 50% RAP renewable road performance of SMA mix- ture of temperature, discussed the effective temperature mixing waste SMA asphalt pavement materials re- generation technology is feasible. The test results show that, with RAP content increases, the reclaimed of SMA mixture temperature stability is improved, and iow temperature cracking resistance and fatigue re- sistance decreases with increasing RAP content, low temperature cracking resistance is constrained to in- crease RAP-doped the amount of technical bottlenecks. When RAP content less than 30% of the renew- able SMA mixture pavement performance specifications meet the technical requirements of the existing construction, after adding 30% recycled materials SMA mixture fatigue performance at reduced levels of each strain to a lesser extent, but RAP content reached 50% after the SMA mixture fatigue life more sig- nificant decline. Laboratory test and engineering application results show that the thermal reclaimed SMA asphalt mixture can be used in the surface layer, waste SMA asphalt pavement material recycling technology is feasible and efficient, its economic and social benefits significantly.

关 键 词：道路工程 高比例RAP掺量 厂拌温再生 温拌再生SMA沥青混合料 路用性能 

分 类 号：U416.26[交通运输工程—道路与铁道工程]