【作者】 黄强；

【导师】 凌天清；

【作者基本信息】 重庆交通大学 ， 交通运输硕士（专业学位）， 2023， 硕士

【摘要】 多孔沥青路面因具有优异的排水降噪等功能在国内外得到了广泛应用,但由于空隙率较大,其结构强度和路用性能不如其他密实型沥青路面。研究表明,沥青60℃动力黏度是影响沥青混合料结构强度和路用性能的关键指标,选用合理黏度的高黏沥青,可以使得多孔沥青混合料具备良好的路用性能,同时也可以提高工程的经济效益,因此对于沥青黏度合理范围的研究具有重要意义。本文通过室内试验,从高黏沥青的制备与性能评价、多孔沥青混合料配合比设计与路面功能验证、不同黏度范围多孔沥青混合料路用性能试验与评价、多孔沥青混合料高黏沥青合理黏度范围研究等方面,对高黏沥青60℃动力黏度与多孔沥青混合料的路用性能指标之间的关系展开了研究,为多孔沥青路面沥青胶结料的合理选择提供科学依据。本文主要研究内容及结论如下:1、通过改变高黏剂掺量,以制备不同黏度的高黏沥青。选用HVA和AR-HVA两种高黏剂分别与SBS改性剂复配,对70#基质沥青进行复合改性,对比两种高黏剂在多种掺量范围内对基质沥青的改性效果,以确定合适的高黏剂种类及掺量。试验结果表明,AR-HVA高黏剂与SBS改性剂复配制备的高黏沥青综合性能更好,因此选用AR-HVA高黏剂与SBS改性剂复配制备不同黏度的高黏沥青进行后续的多孔沥青混合料试验,其中,SBS改性剂掺量为2%,AR-HVA高黏剂掺量为6%、7%、8%、9%、10%。2、选用PAC-13中值级配制备多孔沥青混合料,通过析漏试验和飞散试验,确定不同黏度的高黏沥青对应的最佳油石比。通过黏温曲线法和变温压实法对不同黏度多孔沥青混合料的生产温度和施工温度进行了研究。结果表明,变温压实法可以合理地反映出多孔沥青混合料适宜的生产温度和施工温度。对多孔沥青混合料的结构强度和路面功能进行了验证,试验结果表明,不同黏度的五种多孔沥青混合料均具备良好的排水性能和抗滑性能;随着沥青60℃动力黏度的提高,多孔沥青混合料的马歇尔稳定度也随之提高。3、通过室内试验,对不同黏度多孔沥青混合料的各项路用性能进行了评价。试验结果表明,随着沥青60℃动力黏度提高,多孔沥青混合料的高温稳定性、水稳定性能和抗疲劳性能有明显改善,但对低温抗裂性有不利影响。沥青60℃动力黏度越高,多孔沥青混合料高温稳定性、水稳定性能和抗疲劳性能的提升幅度越小,且对低温抗裂性的不利影响更加明显。4、综合考虑不同黏度范围内,多孔沥青混合料的施工和易性、各项路用性能变化趋势和工程经济效益等因素,对多孔沥青混合料高黏沥青的合理黏度范围进行了研究。推荐高黏沥青黏度范围为3.91×10~4Pa·s～32.61×10~4Pa·s,在此黏度范围内,多孔沥青混合料的各项路用性能表现最佳,施工和易性能适宜,工程经济效益最高。更多还原

【Abstract】 Porous asphalt pavement has been widely used at home and abroad because of its excellent function of drainage and noise reduction,but its structural strength and road performance are inferior to other dense asphalt pavement because of its large void ratio.The research shows that the dynamic viscosity of asphalt at 60℃ is a key index that affects the structural strength and road performance of asphalt mixture.The selection of high-viscosity asphalt with reasonable viscosity can make the porous asphalt mixture have good road performance and improve the economic benefits of the project.Therefore,it is of great significance to study the reasonable range of asphalt viscosity.In this thesis,through laboratory tests,from the preparation and performance evaluation of high-viscosity asphalt,the design of porous asphalt mix and the function verification of pavement,the road performance test and evaluation of porous asphalt mix with different viscosity ranges,and the study of the reasonable viscosity range of porous asphalt mix,etc.The relationship between the dynamic viscosity of high viscosity asphalt at 60℃ and the road performance index of porous asphalt mixture is studied,which provides a scientific basis for the reasonable selection of porous asphalt binder.The main research contents and conclusions of this thesis are as follows:1.High viscosity asphalt with different viscosity can be prepared by changing the content of high viscosity agent.HVA and AR-HVA high viscosity agents were combined with SBS modifier to modify 70# matrix asphalt.The modification effects of the two high viscosity agents in various dosage ranges were compared to determine the appropriate type and dosage of high viscosity agents.The test results show that the high-viscosity asphalt prepared by the combination of AR-HVA high-viscosity agent and SBS modifier has better comprehensive performance.Therefore,high-viscosity asphalt with different viscosity is prepared by the combination of AR-HVA high-viscosity agent and SBS modifier for the subsequent porous asphalt mixture test,in which the content of SBS modifier is 2%.The content of AR-HVA high adhesive is 6%,7%,8%,9%,10%.2.The medium grade of PAC-13 was selected to prepare porous asphalt mixture,and the optimal oil-stone ratio corresponding to high-viscosity asphalt with different viscosity was determined through leakage test and flying test.The production and construction temperatures of porous asphalt mixtures with different viscosity were studied by viscosity-temperature curve method and variable temperature compaction method.The results show that the variable temperature compaction method can reasonably reflect the suitable production temperature and construction temperature of porous asphalt mixture.The structural strength and pavement function of the porous asphalt mixture are verified.The test results show that the five kinds of porous asphalt mixture with different viscosity have good drainage and anti-skid properties.The Marshall stability of porous asphalt mixture increases with the increase of dynamic viscosity at 60℃.3.The road performance of porous asphalt mixtures with different viscosity was evaluated through laboratory tests.The test results show that the high temperature stability,water stability and fatigue resistance of porous asphalt mixture are obviously improved with the increase of dynamic viscosity at 60℃,but the low temperature crack resistance is adversely affected.The higher the dynamic viscosity of asphalt at 60℃,the smaller the improvement of the high temperature stability,water stability and fatigue resistance of porous asphalt mixture,and the adverse effect on the low temperature crack resistance is more obvious.4.Considering the construction workability of porous asphalt mixture in different viscosity ranges,the variation trend of various road performance and engineering economic benefits,the reasonable viscosity range of porous asphalt mixture with high viscosity asphalt was studied.The recommended viscosity range of high viscosity asphalt is 3.91×104Pa·s ～32.61×104Pa·s.In this viscosity range,porous asphalt mixture has the best road performance,suitable construction and easy performance,and the highest engineering economic benefit.更多还原