【作者】 王恩东；

【导师】 王选仓；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2009， 博士

【摘要】 随着我国经济的快速持续发展和高速路网的形成，交通量与日俱增，轴载增大，对沥青路面及其原材料(沥青、集料)的性能提出了更高的要求，普通道路石油沥青已不能满足沥青路面高强、稳定、耐久的路用性能要求，改性沥青的使用已成为提高沥青和沥青混合料性能的重要手段。目前我国使用的大部分为聚合物改性沥青，属于物理改性范畴，存在热储存稳定性差和离析现象，而且生产工艺复杂、造价较高。寻找一种性能突出、稳定性好、性价比高的改性沥青是本文的主要研究内容。本文通过对MAC改性剂的改性机理研究，研发了MAC改性沥青。MAC改性沥青是通过添加改性剂在沥青中通过形成化学反应生成纤维网络结构，从而提高沥青性能，属于化学改性沥青范畴，改性后性能稳定，不存在离析现象，高温时沥青粘度是普通沥青的10倍，是SBS改性沥青的2倍，沥青的SUPERPAVE评价PG等级高温可由64级提高到76级，低温等级能保持在-22级，有效增强了沥青的粘结力。通过本文的研究在国内没有化学改性沥青技术标准和资料的条件下，通过大量室内试验，研究了MAC改性沥青的基本性能以及用于胶泥的性能，提出了MAC改性沥青室内制作工艺以及生产加工的工艺。通过对掺加不同橡胶粉掺量的MAC改性沥青用于AC-20沥青混合料和SMA-13沥青混合料的性能研究，主要包括体积指标、高温性能、水稳定性、低温性能与粘结性能试验，探讨了橡胶粉掺加于MAC改性沥青用于沥青混合料的可行性，并对橡胶粉掺量做出了评价。在沥青混合料集料多级嵌挤级配理论的基础上，提出了具有较好高温稳定性和排水性能的MAC改性沥青大粒径透水性沥青混合料级配参考范围；建立LSPM以沥青膜厚度、设计空隙率、析漏与飞散为控制指标、采用8cm～12cm的车辙板进行稳定性验证的混合料设计方法；通过对大粒径透水性沥青混合料路用性能的初步研究，主要包括高温稳定性试验、水稳定性试验、力学性能与渗透性能试验，探讨了MAC改性沥青用于大粒径透水性沥青混合料的性能技术要求。最后通过试验路铺筑系统研究MAC改性沥青用于大粒径透水性沥青混合料的设计路用性能。经过3～4年行车荷载作用后，实测数据表明使用MAC改性沥青的大粒径沥青混合料加铺旧沥青路面具有良好的抗高温永久变形能力和防止反射裂缝的能力。更多还原

【Abstract】 Over the last decade, with the increasing volume of traffic that is driven by the rapid development of the national economy and the highway network, higher performance of the asphalt mixture and raw materials (asphalt and aggregate) are required because ordinary paving asphalt is unable to meet the high-strength, stability, security and durability requirements. Modified asphalt has become the principal means to increase the performance of asphalt and asphalt mixture. The disadvantages of currently used modified asphalt in China which mainly is multi-polymer modified asphalt that belongs to physical modification are the lower hot-storage stability, segregation, complex processing and higher cost. Find a good stability, outstanding performance, cost-effective modified asphalt is the main purpose of this work.Based on the study of Mechanism of modification, we developed new modified asphalt named MAC which is of chemical modification as to improve asphalt performance by forming fiber network caused by modifier’s chemical reaction. Molecular structure is changed after modification that shows stable performance without any segregation. It’s high-temperature viscosity is 10 times more than ordinary asphalt and 2 times of SBS as well as enhance the cohesive force of the asphalt effectively. The evaluation of SUPERPAVE system shows that its high temperature PG grade is improved from 64 to 76 as well as keeping low temperature PG grade stable at -22. Through a large number of lab tests and practice, we studied the basic performance of MAC and its performance used as gel and proposed "the workmanship of manufacturing MAC in lab" and "the workmanship of manufacturing MAC at workshop" without any domestic chemical modified asphalt technical standard and materials.By mixing MAC modified asphalt with different percentage rubber powder into AC-20 asphalt mixture and SMA-13 asphalt mixture and studying its performance through tests such as, volume index, high temperature performance, water stability, low-temperature bonding Performance tests , we studied the feasibility of mixing rubber powder into the MAC modified asphalt mixture and evaluated the percentage of rubber powder.Based on the multi-grade stone-to-stone theory of aggregate, we proposed the reference grade range of LSPM with MAC in which improved high temperature stability and drainage properties; set up the design method of LSPM that is controlled by the index as asphalt film thickness, design air voids, leakage and Cantabro test as well as confirmed by stability test using 8cm～12cm rutting plate .Preliminary study the performance of LSPM including high-temperature stability test, water stability test, mechanical properties and permeability tests on MAC modified asphalt for LSPM. We investigated the technical requirements of MAC using in LSPM.Finally, paving the trial to study systematically the field performance of MAC modified asphalt for LSPM. After 3 to 4 years vehicle loading, the measured data show that the LSPM with MAC has good performance of high-temperature permanent deformation resistance and reflective cracking resistance.更多还原