SMA沥青混合料指标控制与工程性能研究  

Research on Index Control and Engineering Performance of SMA Asphalt Mixture

作　　者：吴红 WU Hong(China Railway Erju 6^(th)Engineering Co.,Ltd.,Chengdu 610061,China)

机构地区：[1]中铁二局第六工程有限公司,成都610061

出　　处：《路基工程》2024年第3期54-59,共6页Subgrade Engineering

摘　　要：SMA沥青混合料体积指标中填充的细集料、矿粉和沥青的最佳配合比以往采用经验法,导致设计差异较大。结合6条高速公路SMA-13沥青路面的跟踪调研,通过对施工生产配合比进行分析,将矿粉与沥青体积进行关联,确定矿粉最佳掺量;纤维最佳掺量与沥青掺量进行关联,以沥青掺量体积与纤维掺量体积比值为18来确定不同油石比的纤维掺量;粗集料不同密度与沥青密度进行体积关联,以粗集料体积相对密度与沥青相对密度比值为2.02确定沥青油石比。从SMA路面能量角度提出粉胶比施工指标,控制粉胶比为1.80~1.91,60℃环境温度下以弹韧性控制粉胶比为1.85~1.90,20℃环境温度下以弹韧性控制粉胶比为1.81~1.85;控制胶浆填充率为14.2%~15.5%,60℃环境温度下以弹韧性控制胶浆填充率为14.2%~14.7%,20℃环境温度下以弹韧性控制胶浆填充率为15.0%~15.5%。The optimal mix ratio of fine aggregate,mineral powder and asphalt filled in the volume index of SMA asphalt mixture has large design difference used the empirical method in the past.In this paper,based on the follow-up investigation of SMA-13 asphalt pavement of 6 expressways,the optimum content of mineral powder is determined by the correlation between mineral powder and asphalt volume through the analysis of construction and production mix ratio.The optimum amount of fiber is correlated with the amount of asphalt and the fiber content of different asphalt-aggregate ratio is determined by the ratio of asphalt volume to fiber content volume,i.e.18.The volume correlation between different density of coarse aggregate and asphalt density is carried out,and the asphalt-aggregate ratio is determined by the ratio of bulk relative density of coarse aggregate to asphalt relative density,i.e.2.02.From the perspective of SMA pavement energy,the construction index of powder to glue ratio is proposed,and the ratio is controlled to be 1.80−1.91.The powder to glue ratio is controlled to be 1.85−1.90 by the elasticity and toughness at the ambient temperature of 60℃and 1.81−1.85 at 20℃.The filling rate of adhesive cement is controlled to be 14.2%−15.5%,14.2%−14.7%by the elasticity and toughness at 60℃,and 15.0%−15.5%at 20℃.

关 键 词：沥青路面 掺量 粉胶比 控制参数 临界线 路面弹韧性 工程性能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]