温拌沥青混合料关键路用性能分析

发布时间：2018-04-06 04:20

本文选题：有机温拌剂　切入点：拧搓松散破坏　出处：《长安大学》2017年硕士论文

【摘要】：温拌沥青路面在短期使用阶段发生松散、麻面等病害,其破坏特点和作用方式与常见的水损害不同,且病害不能在对沥青混合料进行评价的路用性能上得到反映。这种现状不利于路面病害的控制与处理,应提出温拌沥青混合料路用性能方面的特殊要求。拧搓松散破坏是沥青混合料整体强度不足以抵抗外界复杂的扭转剪切等作用而导致,常发生在汽车转向和制动较为频繁的特殊路段。本文将对温拌沥青混合料的抗拧搓松散性能进行研究,试验采用Sasobit-LM与Honeywell TitanTM两种有机温拌剂,并应用一种新型的拧搓松散试验装置对抗松散性进行评价。试验结果表明,有机温拌剂对混合料的抗松散性能形成负面作用,骨架结构的沥青混合料受到拧搓作用更明显。为理解温拌沥青混合料拧搓松散的破坏特点,对沥青粘结力、沥青混合料摩擦系数、劈裂强度和抗剪强度与混合料松散损失进行相关性分析。根据分析结果,不同力学指标与不同类型沥青混合料松散损失之间的相关性不同。沥青混合料在形成拧搓松散过程中,不同力学方式在拧搓作用中的侧重不一样,单独一种力学指标不能表征拧搓松散破坏。劈裂强度与OGFC-16沥青混合料松散损失的相关程度较高,而抗剪强度与AC-16和SMA-16沥青混合料松散损失的相关度高。添加温拌剂后沥青混合料的高温性能和耐久性能得到改善,同时低温抗裂、水稳定性和抗松散性能变差,其中抗松散性能的下降程度最大。基于此,本文提出在温拌沥青混合料的设计与性能评价中增加抗松散性能,并将松散损失作为抗松散性能的表征与评价指标,将劈裂强度和抗剪强度作为设计时的控制指标。在有机温拌剂应用中,应结合温拌沥青混合料的性能特点,对于温差大、潮湿或交通荷载复杂的路段,注意温拌剂掺量的选取和控制指标的应用等。
[Abstract]:Some diseases such as loose and hemp surface occur in the short-term use of warm mix asphalt pavement. The damage characteristics and action modes are different from the common water damage and the disease can not be reflected on the pavement performance of asphalt mixture evaluation.This situation is not conducive to the control and treatment of pavement diseases, and the special requirements for pavement performance of warm mix asphalt mixture should be put forward.Twisting and loosening failure is caused by the fact that the overall strength of asphalt mixture is not enough to resist the external complex torsional shear and so on. It often occurs in the special section where the automobile steering and braking are more frequent.In this paper, the anti-twist loosening performance of warm mix asphalt mixture is studied. Sasobit-LM and Honeywell TitanTM are used to test the anti-looseness of the mixture, and a new type of loosening test device is used to evaluate the looseness of the mixture.The experimental results show that the organic warm mix has negative effect on the anti-loosening performance of the mixture, and the asphalt mixture with skeleton structure is more obviously twisted and rubbed.In order to understand the failure characteristics of warm mix asphalt mixture, the relationship between asphalt adhesion, asphalt mixture friction coefficient, splitting strength and shear strength and the loose loss of mixture is analyzed.According to the analysis results, the correlation between different mechanical indexes and loose loss of different types of asphalt mixture is different.In the forming and loosening process of asphalt mixture, different mechanical methods have different emphases on twisting and loosening, and only one mechanical index can not represent the loosening failure of twisting.The degree of correlation between splitting strength and loose loss of OGFC-16 asphalt mixture is higher, while the correlation between shear strength and loose loss of AC-16 and SMA-16 asphalt mixture is high.The high temperature performance and durability of asphalt mixture can be improved with the addition of warm mixing agent. At the same time, the low temperature crack resistance, water stability and loosening resistance of asphalt mixture become worse, and the degree of loosening resistance of asphalt mixture is the most serious.Based on this, this paper puts forward to increase the looseness resistance in the design and performance evaluation of warm mix asphalt mixture. The loose loss is taken as the characterization and evaluation index of the anti-loose property, and the splitting strength and shear strength are taken as the control indexes in the design.In the application of organic warm mixing agent, the performance of warm mix asphalt mixture should be combined, and attention should be paid to the selection of warm mix agent and the application of control index for sections with large temperature difference, humidity or complicated traffic load, etc.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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