高性能双层碎石封层用于干线公路沥青面层的技术研究
发布时间：2018-11-09 07:12
【摘要】：现代公路沥青混凝土路面的发展对道路的使用性能提出了越来越高的要求，不仅要求满足交通通行这一基本条件，更需要安全、经济、舒适的功能和使用品质，以及良好的耐久性。我国许多地区的干线公路沥青路面，由于受到原材料和工程造价的影响，路面的一些性能得不到保证，容易出现剥落、坑槽等水损害、路面抗滑性能往往衰减较快。为此，本文开展高性能双层碎石封层用于干线公路沥青面层的技术研究。 针对碎石封层在使用过程容易出现的脱落掉粒、泛油变形等病害，以及行车舒适性较差的缺点，研究中采用双层碎石封层作为干线公路沥青的上面层，并且对双层碎石封层的一些路用性能进行了相应的优化。首先对双层碎石封层上下层石料的配伍性进行研究，选择下层石料粒径较大，上层粒径较小，使得上层石料能够较好的填充并嵌挤在下层石料形成的空隙之间，路面平整度较好，其行车舒适性和耐久性也可得到提升。然后通过理论计算得到不同粒径石料对应所需沥青的用量，通过试铺法得到每档石料的用量，在此基础上调整沥青和石料的用量制定试验方案，采用扫刷试验以扫刷石料的脱落率来得到初步的石料和沥青用量。 对双层碎石封层上下层材料组成设计进行了研究，根据不同的试验指标制定相应的试验方案，通过一系列路用性能试验，包括：高温性能试验、低温性能试验、水稳定性试验、抗滑试验等，确定了双层碎石封层的材料组成。在理论分析及试验研究的基础上，提出了基于路用性能的双层碎石封层多指标控制体系：以高温车辙试验作为泛油的控制指标，以扫刷试验、浸水试验、低温试验的集料脱落率作为粘附性能控制指标，以抗滑摆值作为抗滑性指标，以渗水系数作为排水性指标。 通过对上层石料进行沥青预裹覆并掺加不同目数（8目、16目、30目）的橡胶颗粒，，以进一步提高其高温性能，同时使得上层的粘结性更好，通过车辙试验、扫刷试验等对比分析，得出掺量为上层石料质量2%的16目橡胶颗粒双层碎石封层综合路用性能最佳，路面的防水和排水效果均较好，路面抗滑性能满足要求，且橡胶颗粒的阻尼特性能够起到减振降噪的效果，进一步提高行车舒适性。通过对比4cm沥青混合料面层的造价，掺加橡胶颗粒的双层碎石封层有较好的经济效益，值得今后的推广。
[Abstract]:The development of modern highway asphalt concrete pavement has put forward more and more high requirements for the performance of the road, not only to meet the basic conditions of traffic passage, but also to have safe, economical, comfortable function and service quality. And good durability. Due to the influence of raw materials and engineering cost, some properties of asphalt pavement of trunk highway in many areas of our country can not be guaranteed, and it is easy to appear spalling, pothole and other water damage, and the anti-skid performance of pavement tends to decline quickly. In this paper, the high-performance double-layer macadam seal is applied to the asphalt surface of trunk highway. In view of the defects such as shedding and grain loss, oil flooding and poor driving comfort, the double gravel seal is used as the top layer of asphalt in the main road. At the same time, some road performance of double-layer gravel seal are optimized. First of all, the compatibility of the upper and lower layers of stone is studied. The lower stone is larger in size and smaller in the upper layer, so that the upper stone can be better filled and embedded between the pores formed by the lower stone. Pavement smoothness is good, its driving comfort and durability can also be improved. Then the amount of asphalt corresponding to different particle sizes of stone is obtained by theoretical calculation, and the amount of each grade of stone is obtained by trial paving method. On this basis, the amount of asphalt and stone is adjusted to make the test plan. The primary amount of stone and bitumen was obtained by brushing test in order to sweep the shedding rate of stone. The composition design of upper and lower layer material of double layer stone seal layer was studied. According to different test indexes, the corresponding test scheme was worked out, and a series of road performance tests were carried out, including: high temperature performance test, low temperature performance test, water stability test, etc. The material composition of the double-layer gravel sealing layer was determined by the anti-slip test and so on. On the basis of theoretical analysis and experimental study, a multi-index control system of double-layer gravel sealing layer based on road performance is put forward. The high temperature rutting test is taken as the control index of oil flooding, and the sweep test and immersion test are used. The aggregate shedding rate in low temperature test is used as the adhesion control index, the anti-slip pendulum value as the skid resistance index, and the seepage coefficient as the drainage index. In order to further improve the high temperature performance of the upper layer stone by pre-covering it with asphalt and adding rubber particles with different mesh numbers (8 mesh, 16 mesh, 30 mesh), the upper layer has better adhesion, and the rutting test has been carried out. According to the comparative analysis of brushing test and so on, it is concluded that the comprehensive road performance of 16 mesh rubber particle double layer crushed stone sealing layer is the best, the waterproofing and drainage effect of pavement are better, and the skid resistance of pavement meets the requirement. The damping characteristics of rubber particles can reduce vibration and noise and further improve driving comfort. By comparing the cost of 4cm asphalt mixture surface layer, the double-layer gravel sealing layer with rubber particles has good economic benefit and is worth popularizing in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.21
本文编号：2319715
[Abstract]:The development of modern highway asphalt concrete pavement has put forward more and more high requirements for the performance of the road, not only to meet the basic conditions of traffic passage, but also to have safe, economical, comfortable function and service quality. And good durability. Due to the influence of raw materials and engineering cost, some properties of asphalt pavement of trunk highway in many areas of our country can not be guaranteed, and it is easy to appear spalling, pothole and other water damage, and the anti-skid performance of pavement tends to decline quickly. In this paper, the high-performance double-layer macadam seal is applied to the asphalt surface of trunk highway. In view of the defects such as shedding and grain loss, oil flooding and poor driving comfort, the double gravel seal is used as the top layer of asphalt in the main road. At the same time, some road performance of double-layer gravel seal are optimized. First of all, the compatibility of the upper and lower layers of stone is studied. The lower stone is larger in size and smaller in the upper layer, so that the upper stone can be better filled and embedded between the pores formed by the lower stone. Pavement smoothness is good, its driving comfort and durability can also be improved. Then the amount of asphalt corresponding to different particle sizes of stone is obtained by theoretical calculation, and the amount of each grade of stone is obtained by trial paving method. On this basis, the amount of asphalt and stone is adjusted to make the test plan. The primary amount of stone and bitumen was obtained by brushing test in order to sweep the shedding rate of stone. The composition design of upper and lower layer material of double layer stone seal layer was studied. According to different test indexes, the corresponding test scheme was worked out, and a series of road performance tests were carried out, including: high temperature performance test, low temperature performance test, water stability test, etc. The material composition of the double-layer gravel sealing layer was determined by the anti-slip test and so on. On the basis of theoretical analysis and experimental study, a multi-index control system of double-layer gravel sealing layer based on road performance is put forward. The high temperature rutting test is taken as the control index of oil flooding, and the sweep test and immersion test are used. The aggregate shedding rate in low temperature test is used as the adhesion control index, the anti-slip pendulum value as the skid resistance index, and the seepage coefficient as the drainage index. In order to further improve the high temperature performance of the upper layer stone by pre-covering it with asphalt and adding rubber particles with different mesh numbers (8 mesh, 16 mesh, 30 mesh), the upper layer has better adhesion, and the rutting test has been carried out. According to the comparative analysis of brushing test and so on, it is concluded that the comprehensive road performance of 16 mesh rubber particle double layer crushed stone sealing layer is the best, the waterproofing and drainage effect of pavement are better, and the skid resistance of pavement meets the requirement. The damping characteristics of rubber particles can reduce vibration and noise and further improve driving comfort. By comparing the cost of 4cm asphalt mixture surface layer, the double-layer gravel sealing layer with rubber particles has good economic benefit and is worth popularizing in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.21
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