Report No.	AZP18 (jot this number down to order)
Title	Testing Asphalt-Rubber and Aggregate Mixtures
Author(s)	Jimenez, R.A., U of A
Publisher	ADOT/USDOT/FHWA
Pub. Date	May, 1979
Pages	73
Keywords	asphalt-rubber, bituminous mixture design, pavement design, strain-attenuating layer, asphaltic mixture testing
Description	This report is concerned with the development of a mixture design procedure for asphalt-rubber and aggregate. The investigation was aimed at finding a method for (a) mixing the high-viscosity asphalt-rubber with aggregate, (b) forming of test specimens made with the resilient material, and (c) testing the specimens obtained from compaction of the mixtures. Each of the above factors is discussed along with the test results obtained for Hveem stability, Hveem cohesiometer value, axial tension, double-punch tension and dynamic modulus of elasticity, and double-punch durability. In general, it was found that a normal high shear rate mechanical mixing procedure yielded good aggregate coating; tamping foot (T.I.) compaction was not possible; specimens compacted by static double plunger and also by vibratory-kneading procedures required three days of aging in the mold; specimens had high air void contents; 140F (60C) testing temperature was not feasible, and field trials will be needed to establish design criteria for laboratory prepared specimens. Durability measurements indicated the critical need of clean aggregates and high asphalt content.
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