Gyratory compactor ICT-150 TE standard, set to 1.16° internal angle, conforming to AASHTO T312

Introduction

These Standards specify the method for compaction of cylindrical specimens of bituminous mixtures using a gyratory compactor. Such compaction is achieved by combining a rotary shearing action and a vertical resultant force applied by a mechanical head.

The method can be used for:

• the preparation of specimens of given height at a predetermined density, for subsequent testing of their mechanical properties
• the derivation of a curve density versus number of gyrations;
• the void content for a given number of gyrations.

This Standard applies to bituminous mixtures (both those made up in laboratory and those resulting from work site sampling), with an upper aggregate size not larger than 37.5 mm.
During operation the bituminous mixture is contained within a cylindrical mould limited by inserts and kept at a constant temperature within specified tolerances throughout the whole duration of the test.
Compaction is achieved by the simultaneous action of a low static compression, and of the shearing action resulting of the motion of the centreline of the test piece, which generates a conical surface of revolution, while the ends of the test piece remain approximately perpendicular to the axis of the conical surface.
This method, recommended by the Strategic Highway Research Program - SHRP - SuperPave” System and approved by the Federal Highway Administration (FHWA) is used to produce asphalt specimens that best predict long term pavement performance. The procedure has been established by the American Association of State Highway and Transportation Officials
(AASHTO).

This version complie with all international standards. It allows connection to aPC control with continuous measurement of the specimen density as a function of cycles. Compaction results can be followed during the test and they are recorded by PC for further usage. Other main features are good measuring precision and rigid construction. These models are a portable unit that, due to its little dimension and weight, can be easily fitted and located into laboratory vans and mobile laboratories. The apparatus is easy to use and to maintain. Including height calibration device for 150 mm dia. specimens and Macro software as specified.

Applications

• Excellent tool for volumetric mix design. Provides better paving materials and cost savings in production
• Compacts specimens of hot asphalt mix. emulsion mix and other road construction materials. Prepares specimens for strength, shear, indirect tensile and creep tests
• Usable for other materials comprising emulsions due to percolation collection facility.