Review on Application and Performance of Rock Asphalt in Pavement Engineering
As a sort of environmental protection alternative to asphalt,the natural rock asphalt can not only partially or fully replace current asphalt,but also eliminate the compatibility issues with matrix asphalt.To further promote the application and development of rock asphalt materials for pavement,the research trends of rock asphalt materials for pavement at home and abroad were summarized.This review clarified the differences in source distribution,chemical composition,elemental content,and process efficiency of various types of rock asphalt.It also conducted the thorough comparative evaluation of the basic physical properties,high and low-temperature rheological properties,and aging resistance properties of domestic and foreign rock asphalt and composite modified asphalt.The study summarized the strength,low-temperature crack resistance,high-temperature rutting resistance,and resistance to water damage of rock asphalt modified asphalt mixture.The result indicates that the rock asphalts from different sources have differences in ash content,asphalt content,four components,and elemental content.The different components have different influences on the performance of rock asphalt modified asphalt and asphalt mixtures.The preparation processes for rock asphalt mainly include dry and wet methods,both with advantages and disadvantages.The addition of rock asphalt can improve the high-temperature rheological properties of asphalt,enhancing the resistance of the mixture to high-temperature rutting,water damage,and aging.The large specific surface area,developed pore structure and alkaline minerals contained in ash can improve the asphalt adsorption.There is no generation and disappearance of functional groups in the rock asphalt modification process,which belongs to the physical modification.The rock asphalt can be combined with the asphalt in light component,changing the proportion of viscoelasticity to improve the thermal stability.
road engineeringrock asphalt application and performancereviewrock asphaltresearch progress
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