Browsing by Author "Han, S"

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item: Conference-Full-text
Asphalt pavement texture level and distribution uniformity evaluation using three-dimensional method
(Springer, 2021) Dong, S; Han, S; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
To supplement the research on the evaluationmethod of asphalt pavement texture, novel three-dimensional (3D) methods are proposed. First, pavement textures were measured in laboratory from asphalt mixture specimens using laser texture scanner (LTS), and the macro-texture and micro-texture were extracted based on spectrum analysis techniques. Then, macro-texture level evaluation indices f 8mac and f 9mac together with micro-texture level evaluation indices f 8mic and f 9mic were proposed based on the gray level co-occurrence matrix (GLCM) method, and the hyperparameters existing inGLCMwere discussed. Through the correlation analysis with mean texture depth (MTD) measured by sand patch method (SPM) and friction coefficient μ measured by walking friction tester (WFT), the optimum pavement texture level evaluation indices were determined. Additionally, the evaluation index σ of distribution uniformity of pavement texture (DUPT) was proposed based on the uniformity of deviations between sub-surfaces and the average surface of pavement texture. Finally, the correlations of σ with texture profiles were studied. The results show that f 8mac and f 8mic are the optimum indices for pavement texture level. MTD has significant correlation with f 8mac, and the correlation coefficient R is 0.9348; friction coefficient μ has significant correlation with f 8mic, and the R is 0.8030. The hyperparameters of GLCM selected in this study were proved effective. Moreover, the effectiveness of σ is also validated by calibratingwith standard grooved surface. It can be concluded that the proposed indices in this study are suitable to the evaluation of pavement texture level and pavement texture distribution.
item: Conference-Full-text
Ice-breaking and skid resistance performance evaluation of asphalt pavement groove-filled with elastomer
(Springer, 2021) Yao, T; Han, S; Men, C; Zhang, J; Luo, J; Li, Y; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
Icing on roads in cold regions seriously affects vehicle driving safety. Therefore, this study aims to propose a pavement surface treatment technology with groove-filled elastomer. Through theoretical analysis, the ice-breaking mechanism of groove-filled elastomer asphalt pavement was clarified. Then, through the indoor ice-breaking test, the ice-breaking performance of the asphalt pavement groove-filled with elastomericmaterials under three filling forms of above, level and lower than the asphalt pavement surface and different ice thickness were studied. The results show that the filling form where the elastomer material is flush with the asphalt pavement has the best ice-breaking effect, and the groove-filled elastomer asphalt pavement still has an excellent ice-breaking effect when the thickness of the ice layer is less than 2 mm. Finally, through BPN and friction coefficient test, the skid resistance performance of groove-filled elastomer asphalt pavement under dry, wet and icing conditions is verified. Compared with AC-13 asphalt mixture, the skid resistance of groove-filled asphalt pavement is improved by 4.5, 10.8 and 24.6%.