细粒式薄表层沥青混合料配合比设计及路用性能研究
发布时间：2019-01-08 16:37
【摘要】：如何在有限的财力、物力条件下设计出使用功能好、耐久性强的沥青路面是西部公路建设面临的重大课题。薄表层沥青混凝土路面具有的良好经济和社会效益,在倡导可持续发展的今天,薄表层沥青混凝土路面必将在我国使用得越来越广泛。本文从混合料配合比设计和路用性能两方面,对细粒式薄表层沥青混合料进行系统深入的研究。通过粗集料抗剪强度影响因素相关性分析,认为内摩阻角度可以评价粗集料级配的骨架强度稳定性。采用粗集料-沥青胶浆混合料单轴贯入试验方法,结合粗集料干插捣试验,建立了以粗集料内摩阻角和骨架间隙率为双指标控制的粗集料级配设计体系。借鉴SAC细级配设计理念,并结合粗集料级配设计方法,提出了强骨架细粒式薄表层橡胶沥青混合料配合比设计方法。通过细粒式薄表层沥青混合料常规路用性能试验,分析了不同级配、不同外掺剂、不同铺筑条件对混合料性能的影响,重点研究了不同铺筑条件对细粒式薄表层沥青路面高温稳定性能的影响,提出了适用于细粒式薄表层沥青混合料的材料组成。通过分析认为,细粒式薄表层沥青混合料单位厚度行车荷载冲击破坏能量较高和混合料连通空隙较多是导致薄表层耐久性差的根本原因。本文自主研发自落式冲击仪及相应的冲击冻融劈裂评价方法能反映薄表层沥青混合料使用情况,其相应评价指标-冲击冻融损伤度D与薄表层混合料耐久性相关性良好,通过不同级配、不同沥青、不同厚度沥青混合料冲击冻融试验,分析了各因素对耐久性能的影响,推荐了具有优异耐久性能的细粒式薄表层沥青混合料材料组成。根据细粒式薄表层沥青混合料抗滑和降噪性能试验,分析了不同因素对薄表层沥青路面表面功能的影响,采用路面长期安全效益值Eeff评价路面的抗滑持久性,给出了具有良好抗滑降噪功能的细粒式薄表层沥青混合料推荐组成。通过试验路方案设计、试验路施工和试验路的检测,结合不同铺筑厚度、沥青混合料形式、外掺剂掺量的铺筑方案,验证了细粒式薄表层沥青混合料路面的适用性。
[Abstract]:How to design asphalt pavement with good function and strong durability under the condition of limited financial and material resources is an important subject for highway construction in western China. The thin surface asphalt concrete pavement has the good economic and social benefits. Today, the thin surface asphalt concrete pavement will be used more and more widely in our country. In this paper, the fine grained thin surface asphalt mixture is studied systematically and deeply from two aspects of mixture mix design and road performance. Based on the correlation analysis of the factors affecting the shear strength of coarse aggregate, it is considered that the internal friction angle can evaluate the stability of skeleton strength of coarse aggregate gradation. By adopting the method of uniaxial penetration test of coarse aggregate and asphalt mortar mixture and combining with dry insertion test of coarse aggregate, a design system of coarse aggregate gradation is established, which is controlled by the internal friction angle of coarse aggregate and the ratio of skeleton clearance. Based on the concept of SAC fine gradation design and the coarse aggregate gradation design method, this paper puts forward the design method of the mix proportion of the strong skeleton fine grained thin surface rubber asphalt mixture. The influence of different gradation, different admixture and different paving conditions on the performance of fine grained thin surface asphalt mixture is analyzed by the conventional pavement performance test. The influence of different paving conditions on the high temperature stability of fine grained thin surface asphalt pavement is studied, and the composition of materials suitable for fine grain thin surface asphalt mixture is put forward. Through analysis, it is considered that the high impact failure energy of fine grained thin surface asphalt mixture per unit thickness driving load and the more connected voids of the mixture are the fundamental reasons for the poor durability of thin surface asphalt mixture. In this paper, the self-falling impact instrument and the corresponding impact freeze-thaw splitting evaluation method can reflect the use of thin surface asphalt mixture. The impact freeze-thaw damage degree D has a good correlation with the durability of thin surface asphalt mixture. Through the impact freeze-thaw test of asphalt mixture with different gradation, different asphalt and different thickness, the influence of various factors on durability is analyzed, and the composition of fine grained thin surface asphalt mixture with excellent durability is recommended. According to the test of anti-slip and de-noising performance of fine grained thin surface asphalt mixture, the influence of different factors on the surface function of thin surface asphalt pavement is analyzed. The long-term safety benefit value (Eeff) of pavement is used to evaluate the anti-slip durability of pavement. The recommended composition of fine-grained thin surface asphalt mixture with good anti-slip and noise-reducing function is given. Through the design of the test road, the construction of the test road and the testing of the test road, combined with the different paving thickness, the form of asphalt mixture and the amount of admixture, the applicability of the fine grained thin surface asphalt mixture pavement is verified.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
本文编号：2404855
[Abstract]:How to design asphalt pavement with good function and strong durability under the condition of limited financial and material resources is an important subject for highway construction in western China. The thin surface asphalt concrete pavement has the good economic and social benefits. Today, the thin surface asphalt concrete pavement will be used more and more widely in our country. In this paper, the fine grained thin surface asphalt mixture is studied systematically and deeply from two aspects of mixture mix design and road performance. Based on the correlation analysis of the factors affecting the shear strength of coarse aggregate, it is considered that the internal friction angle can evaluate the stability of skeleton strength of coarse aggregate gradation. By adopting the method of uniaxial penetration test of coarse aggregate and asphalt mortar mixture and combining with dry insertion test of coarse aggregate, a design system of coarse aggregate gradation is established, which is controlled by the internal friction angle of coarse aggregate and the ratio of skeleton clearance. Based on the concept of SAC fine gradation design and the coarse aggregate gradation design method, this paper puts forward the design method of the mix proportion of the strong skeleton fine grained thin surface rubber asphalt mixture. The influence of different gradation, different admixture and different paving conditions on the performance of fine grained thin surface asphalt mixture is analyzed by the conventional pavement performance test. The influence of different paving conditions on the high temperature stability of fine grained thin surface asphalt pavement is studied, and the composition of materials suitable for fine grain thin surface asphalt mixture is put forward. Through analysis, it is considered that the high impact failure energy of fine grained thin surface asphalt mixture per unit thickness driving load and the more connected voids of the mixture are the fundamental reasons for the poor durability of thin surface asphalt mixture. In this paper, the self-falling impact instrument and the corresponding impact freeze-thaw splitting evaluation method can reflect the use of thin surface asphalt mixture. The impact freeze-thaw damage degree D has a good correlation with the durability of thin surface asphalt mixture. Through the impact freeze-thaw test of asphalt mixture with different gradation, different asphalt and different thickness, the influence of various factors on durability is analyzed, and the composition of fine grained thin surface asphalt mixture with excellent durability is recommended. According to the test of anti-slip and de-noising performance of fine grained thin surface asphalt mixture, the influence of different factors on the surface function of thin surface asphalt pavement is analyzed. The long-term safety benefit value (Eeff) of pavement is used to evaluate the anti-slip durability of pavement. The recommended composition of fine-grained thin surface asphalt mixture with good anti-slip and noise-reducing function is given. Through the design of the test road, the construction of the test road and the testing of the test road, combined with the different paving thickness, the form of asphalt mixture and the amount of admixture, the applicability of the fine grained thin surface asphalt mixture pavement is verified.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
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