evaluation of parameters affecting reflection cracking in geogrid-reinforced overlay
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：Shahab Fallah Ali Khodaii
文章页码：1016 - 1025
Key words：reflection cracking; geogrid; bituminous mixture; pavement overlay; bending mode; taguchi method
Abstract: the influence of the most important parameters on the service life of reinforced asphalt overlay with geogrid materials in bending mode was examined by employing the Taguchi method and analysis of variance techniques. The objectives of this experiment was to investigate the effects of grid stiffness, tensile strength, coating type, amount of tack coat, overlay thickness, crack width and stiffnesses of asphalt overlay and existing asphalt concrete on propagation of the reflection cracking. Results indicate that the stiffnesses of cracked layer and overlay are the main significant factors that can directly improve the service life of an overlay against the reflection cracking. Generally, glass grid is more effective in reinforced overlay than polyester grid. Effect of crack width of the existing layer is significant when its magnitude increases from 6 to 9 mm.
Shahab Fallah, Ali Khodaii
(Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran 15875-4413, Iran)
Abstract:the influence of the most important parameters on the service life of reinforced asphalt overlay with geogrid materials in bending mode was examined by employing the Taguchi method and analysis of variance techniques. The objectives of this experiment was to investigate the effects of grid stiffness, tensile strength, coating type, amount of tack coat, overlay thickness, crack width and stiffnesses of asphalt overlay and existing asphalt concrete on propagation of the reflection cracking. Results indicate that the stiffnesses of cracked layer and overlay are the main significant factors that can directly improve the service life of an overlay against the reflection cracking. Generally, glass grid is more effective in reinforced overlay than polyester grid. Effect of crack width of the existing layer is significant when its magnitude increases from 6 to 9 mm.
Key words:reflection cracking; geogrid; bituminous mixture; pavement overlay; bending mode; taguchi method
