Portal de Periódicos da CAPES

EFFECT OF LAYER SLIPPAGE ON PERFORMANCE OF ASPHALT-CONCRETE PAVEMENTS

1986; SAGE Publishing; Issue: 1095 Linguagem: Inglês

2169-4052

M Y Shahin, K Kirchner, E W Blackmon, Hisao Tomita,

Geotechnical Engineering and Underground Structures

Stresses and strains that result from aircraft loading in an asphalt-concrete pavement section were computed by layered elastic theory. A fatigue model was used to estimate the life of the pavement. Variations in interlayer slippage, layer thickness, asphalt stiffness, and pavement loading were shown to affect the life of the pavement. Layer slippage generates large tensile strains at the bottom of the slipped layer. Asphalt at either side of the slipped interface distorts in different directions, which propagates the layer slippage and further destroys the bond between the layers. Under vertical loading in a pavement in which slippage has occurred, increasing the thickness of the slipped overlay decreases the fatigue life of the pavement until a thickness of 6 in. is reached. High asphalt stiffness of thin overlays reduces the fatigue life of the pavement. Horizontal tangential loads cause the location of the maximum tensile strain in the pavement to shift to behind the wheel at the top of the overlay. If slippage has occurred, the horizontal load must be completely withstood by the top slipped layer. This leads to crescent cracks in slipped overlays. The effect is smaller in stiffer layers. The influence of overlay thickness is minor in this case. A pavement in which interlayer slippage has occurred should be repaired by removing the slipped overlay and replacing it with a well-bonded overlay. Overlaying a second time requires a very large overlay to keep the tensile strains in the slipped overlay small.