SMA温拌再生沥青混合料抗疲劳特性的实验研究

发布时间：2018-06-21 05:41

本文选题：抗疲劳 + 再生沥青　；参考：《公路工程》2016年06期

【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。
[Abstract]:Taking the upper layer RAP of the Xi'an section of a Shaanxi Expressway and the mixture SMA 13 as the main material, the fatigue test of the SMA warm mixed asphalt mixture is studied by the four point bending fatigue test. The results show that the stiffness modulus of the mixture of SMA and warm mixed recycled asphalt is gradually reduced with the increase of the loading times; in the warm mixing plant, the strength modulus of the mixture is gradually reduced. At the same time, when the strain level increases from 800 to 1200 um, the strength modulus and cumulative dissipative energy of the mixture decrease and the strain level can reduce the stiffness modulus and cumulative dissipative energy of the mixture. In the warm mixing process, the mixture technology is all at the same time, with the increase of RAP content, the stiffness modulus and modulus of the mixture are increased. The cumulative dissipation energy is increasing, and the addition of RAP can increase the stiffness modulus and cumulative dissipative energy of the mixture. When the RAP content is 0,25%, 35%, the fatigue times of the recycled SMA asphalt mixture with dry mixing method and wet mixing method have a good linear relationship with the cumulative dissipative energy, the fatigue times of the mixture and the linear relationship between the cumulative dissipative energy. It has nothing to do with whether to add Sasobit warm mix agent, what kind of warm mixing process is adopted, and how much RAP is added.
【作者单位】：潍坊科技学院;
【分类号】：U414

【相似文献】