For Aggregate Abrasion Value to EN 1097-8, BS 812:3
Determination of Aggregate Abrasion Value
- The test gives a measure of the resistance of aggregate to surface wear by abrasion.
- The Dorry Abrasion Test was superseded in 1951 by the current AAV test.
- Inadequate abrasion resistance of road-surfacing aggregates means an early loss of the texture depth required to maintain high-speed skidding resistance.
- Two specimens are pressed against the surface of a steel disc rotating in a horizontal plane, with a force of 0.365 newtons per sq. centimeter.
- 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 surfaces.
- Heavy duty mainframe on adjustable anti-vibration pads
- Steel lap wheel 610 mm diameter
- Precision machined steel shaft and sealed bearings
- Resilient mounted electric motor
- Totally enclosed, grease filled gear box
- Scraper blades for sand removal
- Predetermined revolution counter
- Two specimen moulds
- Two flat plates
- Two trays
|Volume (packed)||0.79 cubic metres|
|Electrical Supply||230V 50Hz 1ph|
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