【作者】 周燕；

【导师】 陈拴发；

【作者基本信息】 长安大学 ， 材料学， 2007， 硕士

【摘要】 无论在旧路加铺结构中,还是新建刚性或半刚性基层沥青路面中均存在反射裂缝问题,如何防止或延缓反射裂缝的产生成为目前公路界急需解决的问题。SAMPAVE((?)tress(?)bsorbing(?)ixtures(?)ment)技术是一项基于防止或延缓反射裂缝的产生、发展而提出的一种新技术。首先,对SAMPAVE抗裂结构层改性沥青结合料进行了系统的研究,通过室内试验对各种因素进行分析,提出了适用于工程实际的改性方案并采用SHRP指标进行验证,保证了应力吸收层结合料与路用性能相结合。其次,在混合料配合比设计方面,通过对比SGC设计法与马歇尔设计法确定的最佳沥青用量,提出实际工程可以采用将马歇尔设计方法确定的最佳沥青用量下调0.2%的思想,并进行了低温弯曲、水稳定性等试验验证其路用性能。再次,鉴于目前用于评价普通混合料的试验方法并不适用于应力吸收层混合料,本文首次针对SAMPAVE抗裂结构层混合料提出了高温贯入试验及SCB(Semi-CircularBending)低温疲劳试验。较好的验证了SAMPAVE混合料高温稳定性与低温疲劳性能。最后,试验路的成功铺筑,实现了SAMPAVE技术室内研究与工程实践相结合,推动了该技术的广泛应用。该技术的开发可以进一步推进新型路面结构以及耐久性路面结构应用技术的发展,对公路建设事业的发展具有非常重要的理论和现实意义。更多还原

【Abstract】 The reflective cracking problem exists both in the asphalt overlay on old concrete and in the newly built asphalt pavement on rigid or semirigid base.How to delay or restrain the development of the reflective cracking is an urgent problem. SAMPAVE (Stress Absorbing Mixtures Pavement) is a new kind of technology to delay or restrain the development of the reflective cracking.Firstly, many factors has bing analyzed on the asphalt binder of the SAMPAVE crack resistante layer, the modified scheme applying to project was put forward and was confirmed by SHRP index that unified with the road performance.Secondly, in the mixture proportion design, the optimum asphalt content was designed by the SGC (superpave gyratory compactor) and the Marshall design procedure. Marshall method can determine the optimum asphalt content and when it declines 0.2% it can be applied into actual project.The low temperature curvature tests and water stability tests validate its road performance.Thirdly, besause the present evaluation method on asphalt mixture is not suitable for the stress absorbing mixtures, the penetration test and low temperature SCB fatigue test were put forward for SAMPAVE for the first time. They can effectively validate its fatigue resistance and high-temperature deformation.Lastly, SAMPAVE mixtures are succeedly paved and constructed. That unifies the room research and the project practice and impels its widely application. It also can promote the application of the new asphalt pavement and the perpetual pavement structures and impel the highway construction. It is important for the highway construction.更多还原