ABSTRACT
This paper adopted the compound modification method by using multi-chain polyolefin and SBS to improve the workability and extend the construction temperature range of ultra-thin wearing course materials. Therefore the dense graded Ultra-thin Pavement (U-PAVE) mixture was designed with the nominal maximum aggregate size 10 mm. Based on laboratory results of volumetric properties and pavement performance, design parameters and evaluation indexes of U-PAVE10 were proposed. Meanwhile, the attenuation law of texture depth was comparatively studied via modified wheel tracking test. Besides, the Computed Tomography (CT) scanning method was employed to investigate the void distribution law inside U-PAVE10 samples cored from test roads, and bonding strength with the lower layer was measured by pull out test. The U-PAVE10 exhibited excellent pavement performance during laboratory and field tests. Compared with traditional ultra-thin wearing course materials, the attenuation speed of texture depth for U-PAVE10 was much slower and its bonding effect was better.
