Abstract
The objectives of this research are to use micro- and nanomaterials to modify the asphalt mixture and to evaluate the mechanical performance of asphalt mixtures. These micro- and nanomaterials, including carbon microfiber, Nanomer material, nanosilica, nonmodified nanoclay, and polymer modified nanoclay, were selected to blend with the control asphalt to improve the overall performance of the modified asphalt binders and mixtures. The microstructures of original materials and asphalt binders were observed by the field emission scanning electron microscope (FE-SEM). The mixture performance tests were employed to evaluate the resistance to rutting and permanent deformation of the modified asphalt mixtures. Test results indicate that(1)the dynamic modulus of micro- and nanomodified asphalt mixtures improved significantly;(2)the rutting susceptibility of the modified asphalt mixtures was reduced significantly compared to that of the control asphalt mixture;(3)the microstructures of modified asphalt binders were different from the control asphalt, and the structures determine the improvement in the performance of modified asphalt mixtures. These results indicate that the addition of micro- and nanomaterials enhanced the rutting performance and strength of asphalt mixtures. In addition, the analysis of variance (ANOVA) was used to analyze the modifying effects of micro- and nanomaterials on the performance.
Highlights
In the process of asphalt modification, different materials have been utilized to modify the base asphalt and to improve the pavement and mechanical performance of asphalt binders and mixtures
The SBS modifier was commonly used in the pavement field and the property of SBS modified asphalt was examined by the dynamic shear rheometer (DSR), rotational viscometer (RV), indirect tensile test (ITT), Fourier Transform Infrared (FTIR) spectroscopy, and environmental scanning electron microscope (ESEM) [1,2,3, 9]
Five kinds of micro- and nanomaterials were selected to modify the asphalt mixture based on the literature review
Summary
In the process of asphalt modification, different materials have been utilized to modify the base asphalt and to improve the pavement and mechanical performance of asphalt binders and mixtures. These materials include the styrene-butadienestyrene (SBS) [1,2,3], lime [4, 5], crumb rubber [6], biooil [7], and electronic waste powders [8]. The crumb rubber was used to improve the high-temperature performance of the asphalt and mixtures This utilization expanded the usage of waste tires and reduced the environmental impacts [6]. Swine biooil was used to enhance the low temperature of asphalt [7], and the electronic waste powders were processed to modify the asphalt to improve the resistance to rutting and the environmental issues [8]
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