Aggregate Abrasion Machine

The Cooper-Wessex Aggregate Abrasion machine CRT-AAM determines the Aggregate Abrasion Value (AAV) by measuring the resistance of aggregate to surface wear by abrasion

Inadequate abrasion resistance of road surfacing aggregates means an early loss of the texture depth required to maintain high speed skidding resistance. The Cooper-Wessex Aggregate Abrasion machine determines the Aggregate Abrasion Value by testing the measure of the resistance of aggregate to surface wear by abrasion.
Two specimens are pressed against the surface of a steel disc rotating in a horizontal plane, with a force of 0.365 Newton’s per sq. centimetre. Sand, fed by hoppers, is used as an abrasive. After 500 disc revolutions the amount of material abraded is measured by calculation of the weight loss of the aggregate. The percentage loss in mass of chippings as known as the ‘Aggregate Abrasion Value’ (AAV), and ranges from about 1 for hard flints to over 16 for aggregates normally considered too soft for use in road surfacing.

Key Features

Heavy duty mainframe on adjustable anti vibration pads
Steel lap wheel 610 mm diameter
Precision machined steel shaft and sealed bearings.
Inverter drive to 3 Phase motor for precise speed control
Totally enclosed, grease filled gear box
Scraper blades for sand removal
Predetermined revolution counter
24 V DC control circuits for safety
Interlocked cabinet lid for safety
Sand Scoop to collect spendrift
CE approved

Key Uses

To determine the Aggregate Abrasion Value

Standards

EN 1097-8 : 2009
BS 812 : Part 113 : 1990

Calibration & Maintenance

Calibration, Annual Service and Maintenance Contracts are available for this device. Please enquire for further details.

Note: This device should be checked and calibrated annually.