温拌阻燃沥青混合料性能研究

发布时间：2018-01-22 06:12

  本文关键词： 隧道路面 温拌阻燃沥青混合料 阻燃性能 抑烟性能 路用性能　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：温拌技术能够有效的降低施工温度、节约能源、减少环境污染,并且未降低路用性能。阻燃技术能够有效的抑制沥青路面燃烧、减少烟气的生成。因此,本文将温拌与阻燃技术相结合,制备性能优良的温拌阻燃沥青混合料,对其使用性能进行了系统研究,为温拌阻燃沥青混合料在隧道路面中的应用提供理论依据。本文先从沥青的常规性能及阻燃性能入手,分析了不同Sasobi、3G掺量的基质沥青(SBS改性沥青)、基质阻燃沥青(SBS改性阻燃沥青)的三大指标及氧指数变化规律。结果表明,加入阻燃剂降低了沥青的针入度、延度,提高了沥青的软化点,显著增加了沥青的氧指数；随着Sasobit掺量的增多,沥青针入度、延度呈下降趋势,软化点呈上升趋势；随着3G掺量的增加,沥青针入度总体呈上升趋势,延度呈下降趋势,软化先升高后降低。对于基质温拌沥青,随着Sasobit、3G掺量的增加氧指数呈下降趋势；对于改性温拌沥青,随着Sasobit掺量增加氧指数呈下降趋势,随着3G掺量增加氧指数呈上升趋势。通过离析试验,测试了推荐掺量下两种温拌阻燃沥青的软化点差,其试验结果没有超过规范要求。对掺入推荐掺量温拌剂与阻燃剂的沥青粘度进行了测试,Sasobit降低了沥青的粘度,3G对沥青粘度影响很小。采用马歇尔成型方式,以孔隙率为主导,确定了基于3G、Sasobit和阻燃剂推荐掺量下的施工温度。结果显示,Sasobit、3G温拌阻燃沥青混合料基于基质沥青、改性沥青施工温度分别降低了25℃,20℃；20℃,15℃。利用锥形量热仪分析了6种不同类型沥青混合料的阻燃、抑烟性能。结果显示,无论是单掺阻燃剂与温拌剂,还是复掺都降低了混合料的热释放量、烟释放量。路用性能测试结果表明,外加剂对混合料水稳性能影响不大,加入阻燃剂与温拌剂增加了混合料高温性能,降低了低温性能。
[Abstract]:Warm mixing technology can effectively reduce the construction temperature, save energy, reduce environmental pollution, and do not reduce road performance. Flame retardant technology can effectively suppress the burning of asphalt pavement, reduce the formation of smoke. In this paper, warm mix and flame retardant technology were combined to prepare warm mixed flame retardant asphalt mixture with excellent performance, and its performance was studied systematically. This paper provides the theoretical basis for the application of warm mix flame retardant asphalt mixture in tunnel pavement. This paper starts with the conventional performance and flame retardant performance of asphalt and analyzes different Sasobi. The changes of three indexes and oxygen index of SBS modified asphalt and SBS modified flame retardant asphalt with 3G content were studied. The results showed that the penetration of asphalt was reduced by adding flame retardant. The ductility increases the softening point of asphalt and increases the oxygen index of asphalt. With the increase of Sasobit content, the penetration and ductility of asphalt decreased, and the softening point increased. With the increase of 3G content, the penetration of asphalt increased, the ductility decreased, softening first increased and then decreased. For the matrix warm mix asphalt, with Sasobit. The increase of oxygen index of 3G is decreasing. For the modified warm-mixed asphalt, the oxygen index decreased with the increase of Sasobit content, and increased with the increase of 3G content. The difference of softening point between the two kinds of warm mix flame retardant asphalt under recommended dosage was tested, and the test results did not exceed the requirements of the specification. The viscosity of the asphalt mixed with the recommended amount of warm mix agent and flame retardant was tested. Sasobit reduces the viscosity of asphalt and 3G has little effect on the viscosity of asphalt. The results show that the temperature of modified asphalt is reduced by 25 鈩，

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