Report No.	AZP21 (jot this number down to order)
Title	Laboratory Evaluation of Anti-Reflection Cracking Materials
Author(s)	Jimenez, R.A. & Meier, W.R., Jr., AZ Transportation & Traffic Institute, U of A
Publisher	ADOT/USDOT/FHWA AZ Division
Pub. Date	December, 1983
Pages	93
Keywords	asphalt-rubber, asphalt testing, reflection cracking, strain attenuating material
Description	This report is concerned with the evaluation of four mixtures of asphalt-rubber to serve as a strain attenuating layer in asphaltic concrete overlays. The four mixtures consisted of two different blends of asphalt-rubber and the strain attenuating layer was made with and without stone chips. The tests used for the evaluation were developed to simulate certain pavement loadings, and they were classified as repeated vertical shear, horizontal shear, repeated horizontal shear, and flexure fatigue. Calculations were carried out to determine the effects of the strain attenuating layer on stress in the laboratory models and also in flexible layered pavement systems. The laboratory test results showed that the layers without the stone chips had the best performance. The calculations for the laboratory and pavement models indicated that the greatest effects brought about by the layer was in reduction of horizontal shear at the overlay-layer interface and that there must by a limiting thickness of the layer to prevent tensile overstress of the bottom surface of the asphaltic concrete overlay.
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