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Key Words: SAMI, overlay, refleciive cracking, simulation, temperature shrinkage, hysterics energy, FEM, overlay design

THE RESEARCH ON REFLECTIVE CRACKING INHIBITION EFFECT USING STRESS ABSORBING MEMBRANE INTERLAYER

Nagato ABE, Hironobu MAEHARA and Teruhiko MARUYAMA

The crack is caused on the surface of the overlay layer at an early stage by the movement of the pavement with the temperature change in the pavement and the traffic load. When the method in which the crack arises on the surface in this overlay layer is delayed, there is a method for using the Stress Absorbing Membrane Interlayer (SAMI) for the intermediate layer. The test which simulated the horizontal movement with the effect of the overlay using the SAMI was carried out.
As a result, it becomes clear that stress absorbing effect of SAMI and stone matrix asphalt (SMA) are high for the horizontal expand and contract test. In addition, the investigation data of experimental pavement was analyzed by the finite element analysis (FEM) and the prediction procedure of the necessary overlay thickness was also examined from the FWD measurement result in the field.