摘要
以陕西某高速公路西安段的上面层RAP和混合料SMA—13为主要材料,采用四点弯曲疲劳试验,对SMA温拌再生沥青混合料抗疲劳特性实验进行了研究。结果表明,随着荷载作用次数增加,SMA温拌再生沥青混合料的劲度模量逐渐减小;在温拌工艺、混合料技术、RAP掺量均相同时,当应变水平从800με增加到1 200με,混合料劲度模量和累积耗散能呈下降趋势,增加应变水平可降低混合料劲度模量和累积耗散能;在温拌工艺、混合料技术均相同时,随着RAP掺量增大,混合料劲度模量和累积耗散能呈增加趋势,添加RAP可提高混合料劲度模量和累积耗散能;在RAP掺量分别为为0、25%、35%时,同坐标下,采用干拌法和湿拌法的再生SMA沥青混合料疲劳次数与累积耗散能线性关系良好,混合料疲劳次数、累积耗散能间的线性关系,与是否添加Sasobit温拌剂、采用何种温拌制备工艺、RAP掺量多少等无关。
In this paper, we take theupper layer RAP and the mixed material SMA-13 as the main material the section of a highway of Xi＇an in Shaanxi, using four point bending fatigue test of asphalt mixture fatigue properties was studied on the regeneration of SMA warm mix. The results show that as the load increased the number of SMA warm mix asphalt mixture stiffness modulus decreases gradually; in the process, the mixture of warm mix technology, the content of RAP are the same, when the straiu level from 800 to 1 200 Mu Mu epsilon epsilon, mixture stiffness modulus and cumulative dissipated energy decreased and the increase of strain level can reduce mixture stiffness modulus and cumulative dissipated energy; in the process, the mixture of warm mix technology are the same, with the increasing dosage of RAP, mixture stiffness modulus and cumulative dissipated energy increased, adding RAP can improve the mixture stiffness modulus and cumulative dissipated energy in RAP doped ; were 0, 25% and 35%, with the coordinates, the regeneration of SMA asphalt mixture fatigue dry mixing method and wet mixing method and cumulative dissipated energy a good linear relationship. The linear relationship between the number of mixture fatigue, the cumulative dissipated energy, and whether to add Sasobit warm mix agent, the warm mix of the preparation process, the amount of RAP mixing.
出处
《公路工程》
北大核心
2016年第6期267-270,282,共5页
Highway Engineering
关键词
抗疲劳
再生沥青
SMA温拌
掺量
anti fatigue
recycled asphalt
SMA warm mix
content
