【作者】 欧阳伟；

【导师】 王连广；

【作者基本信息】 东北大学 ， 结构工程， 2010， 博士

【摘要】 本文在借鉴国内外相关研究成果的基础上,对低标号高模量沥青混合料与外掺剂高模量沥青混合料的材料组成及配合比设计进行研究。试验分析了高模量沥青混合料的路用和力学特性;并以提高沥青路面中面层高温动态模量为研究目标,验证了提高路面中面层高温动态模量可以有效降低沥青混合料在行车荷载作用下的压、剪应变,加大中面层混合料向下传递荷载的扩散角,减少车辆荷载作用下沥青混凝土产生的累积变形,提高路面高温抗变形能力,减小并延缓沥青路面高温车辙的产生,改善路面服务状况,延长路面的使用寿命。论文研究工作的创新性和所取得的主要研究成果如下:提出了采用低标号高模量沥青胶结料与添加外掺剂的方法可以获得高模量沥青混合料。通过车辙试验、动态模量试验、蠕变试验、劈裂试验、弯曲试验、耐久性试验等验证了高模量沥青混合料的高温抗变形能力,即其动态模量较普通沥青混合料及SBS改性沥青混合料比较有显著提高。同时,高模量沥青混合料也保证了其具有良好的低温性能、抗水损害性能及抗疲劳性能。采用数值分析的方法对路面结构在提高模量情况下的力学响应进行了分析。分析表明提高沥青路面中层模量能够有效降低路面车辙病害的发生,延长使用寿命。在道路使用的全寿命周期内可获得较高的经济效益与社会效益。提出了高模量沥青混凝土的界定标准,并建议路面结构设计采用45℃的动态模量作为设计参数,为柔性路面设计以及长寿命路面在我国的广泛研究与应用提供了可借鉴的基础资料。通过实体工程的铺筑,总结了高模量沥青混凝土路面施工工艺和质量控制指标,检测和观测结果进一步验证其良好的抗车辙性能。并为其应用与推广提供了技术保障。更多还原

【Abstract】 This article states the technical way to produce high modulur asphalt concrete(HMAC), specifies the performance of composing materials in detail and their influence upon the HMAC material. The performance of HMAC with low-grade and high modulur asphlt aggregates and extra additives was study. Goal of this article was to increase the dynamic modulus of the middle course in pavement under high temperature. It was verified that the middle course with high dynamic modulus under high temperature could effectively reduce the compressive and shearing strain of ac from traffic load and increase the stress dispersion angle from middle to bottom.HMAC (high modular asphalt concrete) resist the deformation of the asphalt concrete which is imposed by the vehicle load decrease, and improve deformation in high temperature、fatigue property of road, and prolong service lifetime of road through improving the modular of the asphalt concrete.The achivements obtained from this article are as follows:1. HMAC was obtained through low-grade and high modulur asphlt aggregates. Adopting extra additives is another approach to increase the high dynamic modulus under high temperature. By testing the performance at the high temperature and low temperature、fatigue property and anti-water damage ability of the mixture respectively it was indicated that the performance of asphalt mixture obtained by the two approaches is better at high temperature than that adopting asphalt modified by sbs, and for fatigue property asphalt with high modulus and low penetration was similar. It was also verified that asphalt modified by sbs has little contribution to dynamic modulus under high temperature and creep resistance property but significant contribution to high temperature performance and anti-bending fatigue of asphalt mixture.2. According to the theory of finite element method, this test selects the typical pavement structure, establishes the highway wheel load asphalt pavement of the simplified model and finite element model, applies the finite element analysis method to vehicles and pavement interaction, analyzes the response of pavement structure in the load stress and strain distribution, and discusses the formation mechanism of road surface wheel rut.3. The definition standards of HMAC is proposed and it suggested that pavement structure design should adopt dynamic modulus at 45℃as parameter. This study proposed reliable data for the wide application of long-life pavement.4. Construction technology and quality controlling index of HMAC were summed and provid technology gurantee.更多还原