Shear-Torque Fatigue Performance of Geogrid-Reinforced Asphalt Interlayers

Abstract

Interlayer reinforcement systems represent a valid solution to improve performance and extend the service life of asphalt pavements, reducing maintenance costs. The main issue is that the presence of reinforcement may hinder the full transmission of stresses between asphalt layers, reducing the overall pavement bearing capacity. This study aimed at evaluating the mechanical behavior of geogrid-reinforced asphalt interlayers under cyclic shear loading. To this purpose, a trial section, characterized by three types of interface (reinforced with carbon fiber grid, reinforced with glass fiber grid and unreinforced), was built. Cores were taken from the trial section to carry out shear-torque fatigue tests. Static Leutner shear tests were also performed on cored specimens having the same interface configuration. From data gathered in the present study, shear-torque fatigue tests have proved to be a powerful tool for investigating reinforced specimens. Results clearly ranked the investigated materials, showing that the glass fiber grid has the lowest shear fatigue performance in comparison with the other two interfaces at 20 °C. However, the shear fatigue resistance of glass fiber grid increases significantly at 10 °C. Finally, an interesting correlation was found between cyclic and static shear test results that should be better investigated in future studies.

Geosynthetic Reinforcement: A Strategy for Preventing Deformation of Flexible Pavements on Unstable Ground

“…10 −3 %. These findings are in line with those of other similar studies, which emphasise that the use of geogrids contributes effectively to reducing the horizontal deformation of the pavement, which can considerably improve its ability to withstand loads and stresses [47],. This optimisation further reinforces this trend by further limiting horizontal deformations, which contributes to better resistance to lateral stresses.…”

Simplified Methodology for Fatigue Analysis of Reinforced Asphalt Systems

“…Among the frequently utilized laboratory tests are: Three Point Bending Beam − 3PBB [11,22,23], 15,17,24], -ASTRA interface direct shear test [6,11] and Overlay Tester -OT [14,21]. The fact that some researchers had designed different types of testing con gurations such as the sheartorque fatigue test [25] and anti-re ective cracking system [13,26,27] further illustrates how crucial it is to examine the impact of grids on pavement performance. However, one of the tests that has been employed most frequently in earlier studies is the 4PBB test, which accurately depicts the loading condition that would occur in the eld under the impact of tra c and resulting tensile strains.…”

The dynamic responses of an infinite plate resting on a poroelastic layered half‐space soil medium with imperfect interface to a moving load

“…On the other hand, it is of primary importance to formulate imperfect interface conditions mathematically to measure the effect of the imperfect interface on the whole structure. Researchers have created several contact models for mechanical analysis to study the effect of interlayer connection on the road response: stickiness Knot coefficient model [18,19], friction coefficient model [20], compliance coefficient [21], and interlayer shear strength model [22][23][24][25], etc. Moreover, Piotr Jaskula [26] analyzed and calculated the premature failure of the newly built and rebuilt pavement structure, and found that the poor interlayer contact conditions between the structural layers have a greater impact on the calculated fatigue life of the pavement.…”