Research Progress on Four Components and Microscopic Properties of Natural Rock Asphalt
With the gradual depletion of oil resources and the rise of the"dual carbon"trend,natural rock asphalt is favored by road engineering researchers because of both excellent road performance and low price.In order to fur-ther promote the development of research on the four components and microstructure of natural rock asphalt,the ap-plication and development history of natural rock asphalt was first reviewed at home and abroad;Subsequently,the four component content and related analysis were introduced;Finally,the functional group composition,surface microstructure and aggregation,and phase composition of natural rock asphalt were analyzed using three methods of Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),and X-ray diffraction(XRD)from the microscopic perspective.The research results indicate that the application and research of natural rock as-phalt of foreign countries were earlier than China,but the microstructure study is more in-depth in China;The con-tent of the four components in natural rock asphalt varies significantly depending on the place of origin,but its as-phaltene content is much higher than that of matrix asphalt.The colloidal instability formula is not applicable for the calculation and quantitative evaluation of natural solid rock asphalt;By observing the changes in functional groups in FTIR,it was found that different types and contents of natural rock asphalt mainly modify the matrix asphalt in the physical property,without involving changes in functional groups;From a microscopic perspective,the surface morphology of natural rock asphalt is observed by SEM to be relatively rough and the aggregation degree is relatively tight,which can effectively enhance its resistance to water peeling;natural rock asphalt is found by XRD to contain more alkaline mineral elements,significantly improving the adhesion between binders and aggregates.
road engineeringnatural rock asphaltapplication development history home and abroadfour-com-ponent analysismicroscopic property
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