首页|A State-of-the-Art Review on the Functionality of Ultra-Thin Overlays Towards a Future Low Carbon Road Maintenance
A State-of-the-Art Review on the Functionality of Ultra-Thin Overlays Towards a Future Low Carbon Road Maintenance
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Highway maintenance mileage reached 5.25 million kilometers in China by 2021.Ultra-thin overlay is one of the most commonly used maintenance technologies,which can significantly enhance the eco-nomic and environmental benefits of pavements.To promote the low-carbon development of ultra-thin overlays,this paper mainly studied the mechanism and influencing factors of several ultra-thin over-lay functions.Firstly,the skid resistance,noise reduction,rutting resistance,and crack resistance of ultra-thin overlays were evaluated.The results indicated that the high-quality aggregates improved the skid and rutting resistance of ultra-thin overlay by 5％-20％.The optimized gradations and modified binders reduced noise of ultra-thin overlay by 0.4-6.0 dB.The high viscosity modified binders improved the rut-ting resistance of ultra-thin overlay by about 10％-130％.Basalt fiber improved the cracking resistance of ultra-thin overlay by more than 20％.Due to the thinner thickness and better road performance,the performance-based engineering cost of ultra-thin overlay was reduced by about 30％-40％compared with conventional overlays.Secondly,several environmentally friendly functions of ultra-thin overlay were investigated,including snow melting and deicing,exhaust gas purification and pavement cooling.The lower thickness of ultra-thin overlay was conducive to the diffusion of chloride-based materials to the pavement surface.Therefore,the snow melting effect of self-ice-melting was better.In addition,the ultra-thin overlay mixture containing photocatalytic materials could decompose 20％-50％of the exhaust gas.The colored ultra-thin overlay was able to reduce the temperature of the pavement by up to 8.1 ℃.The temperature difference between the upper and lower surfaces of the ultra-thin overlay containing thermal resistance materials could reach up to 12.8 ℃.In addition,numerous typical global engineering applications of functional ultra-thin overlay were summarized.This review can help better understand the functionality of ultra-thin overlays and promote the realization of future multi-functional and low-carbon road maintenance.
Road maintenanceUltra-thin overlaySnow melting and deicingExhaust gas purificationPavement coolingLow-carbon
Meng Guo、Rui Zhang、Xiuli Du、Pengfei Liu
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State Key Laboratory of Bridge Engineering Safety and Resilience,Beijing University of Technology,Beijing 100124,China
The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China
Institute of Highway Engineering,RWTH Aachen University,Aachen 52074,Germany
国家重点研发计划国家自然科学基金German Research FoundationGerman Research Foundation
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