橡胶改性剂对沥青及其混合料性能影响研究

发布时间：2018-04-01 17:20

本文选题：掺RM沥青　切入点：SBS改性沥青　出处：《武汉理工大学》2014年硕士论文

【摘要】：在目前内外高速公路建设中，使用最为广泛的是SBS改性沥青路面。SBS是一种石油产物，SBS改性沥青的大量使用，导致了SBS价格昂贵和不可再生性等问题。橡胶沥青因其具有良好的性能，已经在国内外高速公路中推广应用，橡胶沥青的储存稳定性和运输、使用过程中的高能耗一直制约着橡胶沥青的发展。本文以新型橡胶改性剂RM作为外掺剂，制备了掺橡胶改性剂沥青和掺RM沥青混合料，并对其性能进行评价，同时对掺RM沥青和SBS改性沥青的性能、沥青混合料的路用性能和经济性能进行了研究评价，主要研究工作包括：首先对掺RM沥青、SBS改性沥青和70#基质沥青进行性能分析，就三大指标、流变性能和粘弹性力学相应对三种沥青进行比较分析。三大指标试验的结果表明，RM可以明显改善沥青的基本性能；DSR试验结果表明，RM的掺入对沥青的流变性能影响较为复杂，在高温时掺RM可以是沥青的复合模量增大，相位角降低；在低温阶段，RM使得沥青的复合模量降低，相位角增大。结果表明掺入RM沥青的抗车辙性能、中低温抗疲劳性能和温度敏感性都有不同程度的改善，其中对高温性能的影响尤为明显。通过高温蠕变试验和低温应力松弛试验可知，，B能提升沥青的蠕变恢复量和缩短沥青的松弛时间。第二，对掺RM沥青混合料、SBS改性沥青混合料和基质沥青混合料进行水稳性能、高温性能和低温性能进行研究，试验结果表明掺RM沥青混合料的水稳性能较SBS改性沥青略差，RM的掺入使得沥青的动稳定度提高，相对变形量减少。掺RM沥青混合料的低温抗裂性优于基质沥青混合料，比SBS改性沥青混合料略差。第三，采用Superpave简单性能试验方法研究了三种沥青混合料的动态模量和疲劳性能。研究结果表明：沥青混合料动态模量和相位角具有明显的频率和温度依赖性，RM的掺入能提高沥青混合料的动态模量，掺RM的沥青混合料粘弹性能要优于SBS改性沥青混合料；采用时温等效效应得到沥青混合料的动态模量主曲线，RM的掺入能降低沥青混合料的温度敏感性；沥青混合料的动态模量与相位角的关系可以用半对数模型来表征；RM掺入后沥青混合料的疲劳寿命得到明显的改善，其改善效果在较高应变水平下表现更加显著，掺RM沥青混合料的疲劳性能在低应变水平下比SBS改性沥青混合料要略差，在高应变水平下两种沥青混合料的疲劳性能基本一致。经过成本分析，本文研究下的RM的掺量可以在混合料功能与SBS改性沥青混合料基本保持一致的前提下，降低沥青混合料的成本。
[Abstract]:In the current highway construction, the most widely used is the SBS modified asphalt pavement, which is a kind of petroleum product. Because of its good performance, rubber asphalt has been widely used in expressway at home and abroad, the storage stability and transportation of rubber asphalt, The development of rubber asphalt has been restricted by high energy consumption. In this paper, a new rubber modifier, RM, is used as the admixture to prepare rubber modifier asphalt and RM asphalt mixture, and its performance is evaluated. At the same time, the performance of modified asphalt mixed with RM and SBS, the road performance and economic performance of asphalt mixture are studied and evaluated. The main research work includes:. First of all, the performance of SBS modified asphalt and 70# base asphalt mixed with RM asphalt were analyzed, and the three indexes were analyzed. The three kinds of asphalt were compared and analyzed by rheological property and viscoelastic mechanics. The results of three index tests show that RM can obviously improve the basic properties of asphalt. The results of DSR test show that the influence of the addition of RM on the rheological properties of asphalt is more complex. At high temperature, adding RM can increase the composite modulus of asphalt, decrease the phase angle, decrease the composite modulus and increase the phase angle of asphalt at low temperature. Moderate and low temperature fatigue resistance and temperature sensitivity have been improved in varying degrees. The creep test and stress relaxation test show that the creep recovery of asphalt can be increased and the relaxation time of asphalt can be shortened. Secondly, the water stability, high temperature and low temperature performance of SBS modified asphalt mixture and matrix asphalt mixture mixed with RM asphalt mixture are studied. The test results show that the water stability of the asphalt mixture mixed with RM is a little worse than that of the modified asphalt with SBS. The dynamic stability of the asphalt is improved and the relative deformation is reduced. The low temperature crack resistance of the asphalt mixture mixed with RM is better than that of the base asphalt mixture. It is a little worse than SBS modified asphalt mixture. Third, The dynamic modulus and fatigue properties of three kinds of asphalt mixtures are studied by Superpave simple performance test method. The results show that the dynamic modulus and phase angle of asphalt mixture have obvious frequency and temperature dependence. Improve the dynamic modulus of asphalt mixture, The viscoelastic energy of asphalt mixture mixed with RM is better than that of SBS modified asphalt mixture, and the temperature sensitivity of asphalt mixture can be reduced by adopting the equivalent effect of time temperature to obtain the dynamic modulus of asphalt mixture. The relationship between dynamic modulus and phase angle of asphalt mixture can be represented by semi-logarithmic model to show that the fatigue life of asphalt mixture after mixing with RM is obviously improved, and the improvement effect is more remarkable at higher strain level. The fatigue performance of RM mixed asphalt mixture is slightly worse than that of SBS modified asphalt mixture at low strain level, and the fatigue performance of two kinds of asphalt mixture is basically the same at high strain level. In this paper, the content of RM can reduce the cost of asphalt mixture on the premise that the function of mixture is consistent with that of SBS modified asphalt mixture.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】