Abstract
In order to improve the mechanical properties of asphalt pavement, geosynthetics can be employed in asphalt mixture. This research designed 12 reinforced schemes based on the types of geosynthetics, bonding layers and reinforced position. For the relative tests carried out, reinforced specimens were prepared according to each individual scheme. Moreover, rutting tests, bending creep tests and split fatigue tests were carried out on reinforced specimens in the laboratory. The results obtained in this investigation showed that the dynamic stability, bending creep rate and fatigue life of geocell-reinforced specimens are better than those of geogrid-reinforced specimens. The bonding layer of Styrene-Butadiene-Styrene (SBS) modified asphalt is better than epoxy modified asphalt. The dynamic stability and fatigue life of middle reinforcement are better than those of the lower reinforcement, while the bending creep rate of the lower reinforcement is better than middle reinforcement. In addition, reinforced scheme (9) has the largest increase in dynamic stability and fatigue life by 103 and 137%, respectively, and reinforced scheme (12) has the largest reduction in bending creep rate by 46%. However, scheme (9) improved dynamic stability and fatigue life by 43 and 29% higher than scheme (12), while the reduction of flexural creep rate of scheme (12) is only 7% higher than that of scheme (9).
Highlights
Asphalt pavements are subjected to high traffic volumes generating distresses such as rutting and cracking that need frequent and expensive maintenance [1,2]
Bertuliene et al [12] conducted a series of rutting tests to explain the role of geosynthetics in the asphalt layer, and the results showed that the rut depth of the reinforced specimens decreased by 40% compared with unreinforced
Correia et al [13] used a self-made wheel loading device to cyclically load the geogrid-reinforced specimens, the results showed that compared with the unreinforced specimens, the rut depth of reinforced specimens was reduced by 40%, and the stress and strain at the bottom of the asphalt layer were reduced by 30 and 55%, respectively
Summary
Asphalt pavements are subjected to high traffic volumes generating distresses such as rutting and cracking that need frequent and expensive maintenance [1,2]. There are two fundamental approaches to soothe this issue: one is to frequently mill and apply a new asphalt overlay (mill and fill) at certain intervals of the pavement’s service life [3,4,5] This approach is rather expensive due to a need for renewal over a short period of time, which in turn requires additional financial and material resources and does not correspond with the environmental concerns arising from releasing large amounts of emissions in the air along with high-energy consumption. The test results showed that the application of geogrid as a reinforcement layer in asphalt pavement can improve the anti-rutting performance of the pavement, and the improvement of flexible geogrid reinforcement is higher than that of rigid geogrid reinforcement
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