高模量沥青混合料专用硬质沥青的研制与应用
发布时间：2018-11-24 17:04
【摘要】：由于沥青胶结料属于黏弹性材料，在高温与行车剪应力的共同作用下，不可避免的要发生黏性流动，产生永久性变形，进而形成车辙。国内外道路沥青工作者为解决车辙问题进行了大量的研究工作，但大多是从沥青混合料级配着手。如何从沥青胶结料入手，通过改善其塑性性质，提高沥青混合料的整体模量而减少车辙显得尤为重要。 目前，国内还没有高模量沥青混合料专用硬质沥青的技术标准，通常将满足GB/T15180-2000和JTG F40-2004中50号和30号的低标号道路沥青称为硬质沥青。但是50号和30号低标号道路沥青的针入度指标并不满足欧州标准EN13924的要求，而且应用于高模量沥青混合料AC EME中，难以满足NF EN13108-1对复数模量≥14000MPa的技术要求。因此，，50号和30号低标号道路沥青只属于普通的道路沥青范畴，不能称之为硬质沥青，而严格意义上的硬质沥青是指符合欧州标准EN-13924，针入度为15-251/10mm或10-201/10mm的两种牌号的沥青，主要应用于高模量沥青混合料AC EME中。它对中温延度和蜡含量没有技术要求，但对老化后软化点变化、135℃黏度及脆点等都有严格的技术要求。 基于原油性质、加工工艺对硬质沥青的高低温性能影响较大，而且国内目前也没有统一的硬质沥青技术标准为应用单位在选择硬质沥青品种时提供可参考的理论依据。本文将对硬质沥青生产原料选取、加工工艺评选进行系统研究，并对高模量沥青混合料路用性能进行详细评价。试验结果表明：克拉玛依石化公司丙烷脱沥青工艺生产的硬质沥青具有优良的水稳定性能、高温稳定性能和高模量性能，具有优良的应用前景。 通过本研究，对高模量沥青混合料技术及其专用硬质沥青有了新的认识，为高模量沥青混合料专用硬质沥青的推广与应用提供了试验依据，同时也为高等级公路沥青路面建设工程提供了一种新的解决路面车辙的思路和方法。
[Abstract]:Because asphalt binder belongs to viscoelastic material, under the joint action of high temperature and driving shear stress, viscous flow will inevitably occur, resulting in permanent deformation and then rutting. Road asphalt workers at home and abroad have done a lot of research to solve the rutting problem, but mostly from the asphalt mixture gradation. It is very important to improve the plastic properties of asphalt binder and reduce the rutting of asphalt mixture by improving the overall modulus of asphalt mixture. At present, there is no technical standard of hard asphalt for high modulus asphalt mixture in our country. The low-grade road asphalt that meets the requirements of GB/T15180-2000 and JTG F40-2004 is usually called hard asphalt. However, the penetration index of 50 and 30 low-grade road asphalt does not meet the requirements of European standard EN13924, and it is difficult to meet the technical requirements of NF EN13108-1 for complex modulus 鈮
本文编号：2354419
[Abstract]:Because asphalt binder belongs to viscoelastic material, under the joint action of high temperature and driving shear stress, viscous flow will inevitably occur, resulting in permanent deformation and then rutting. Road asphalt workers at home and abroad have done a lot of research to solve the rutting problem, but mostly from the asphalt mixture gradation. It is very important to improve the plastic properties of asphalt binder and reduce the rutting of asphalt mixture by improving the overall modulus of asphalt mixture. At present, there is no technical standard of hard asphalt for high modulus asphalt mixture in our country. The low-grade road asphalt that meets the requirements of GB/T15180-2000 and JTG F40-2004 is usually called hard asphalt. However, the penetration index of 50 and 30 low-grade road asphalt does not meet the requirements of European standard EN13924, and it is difficult to meet the technical requirements of NF EN13108-1 for complex modulus 鈮
本文编号：2354419
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