Abstract
Ultra-thin asphalt overlay has become the mainstream measure of road preventive maintenance due to its good economic benefits and road performance. However, hot mix asphalt concrete technology is widely used at present, which is not the most ideal way to promote energy saving and emission reduction in the field of road maintenance. At the same time, the ultra-thin friction course based on cold mix technology, such as slurry seal layer, micro-surface, and other technologies, are still far behind the hot mix friction course in terms of crack resistance. In this research, by establishing an integrated design of materials and structures, a cold paving technology called “high-toughness cold-mixed ultra-thin pavement (HCUP)” is proposed. The high-viscosity emulsified bitumen prepared by using high-viscosity and high-elasticity modified bitumen is used as the binder and sticky layer of HCUP. The thickness of HCUP is 0.8–2.0 cm, the typical thickness is 1.2 cm, and the nominal maximum size of the coarse aggregate is 8 mm. Indoor tests show that HCUP-8 has water stability, anti-skid performance, high temperature performance, peeling resistance, and crack resistance that are not weaker than traditional hot-mixed ultra-thin wear layers such as AC-10, Novachip, and GT-8. At the same time, the test road paving further proved that HCUP-8 has excellent road performance with a view to providing new ideas for low-carbon and environmentally friendly road materials.
Highlights
Published: 6 December 2021The ultra-thin asphalt wear layer is a road surface overlay technology that focuses on improving the functional performance of roads, and it is one of the most promising road preventive maintenance technologies at present [1,2,3]
The impact toughness test uses the area from the point of load as AC-10, Novachip, GT-8, and high-toughness cold-mixed ultra-thin pavement (HCUP)-8 in order
HCUP-8 for is 6.86 which exceeds technical of ordinary hot mix energy the kN, asphalt mixture to the break due torequirements the impact load, and to evaluate asphalt mixtures
Summary
The ultra-thin asphalt wear layer is a road surface overlay technology that focuses on improving the functional performance of roads, and it is one of the most promising road preventive maintenance technologies at present [1,2,3]. In view of the technical defects of the hot-mixed ultra-thin wear layer, in order to further improve the social, economic and environmental benefits of the ultra-thin wear layer, various thin layer technologies for low-temperature paving have begun to be developed and applied. Breaking through the technical shortcomings of the traditional coldmixed ultra-thin wearing layer, and developing low-carbon, environmentally friendly and high-quality cold-mixed ultra-thin wearing layer technology with excellent durability will have broad prospects. Research on raw material design, grading design, road performance verification, crack resistance evaluation, etc., is carried out, and a hightoughness cold mix ultra-thin pavement technology (HCUP) is proposed. The implementation process and on-site performance testing of the HCUP test road are briefly introduced in order to provide a reference for the research of high-quality cold-mixed ultra-thin wear layer
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