Dorry Abrasion Machine to BS812-113 EN1097-8

Dorry Abrasion Machine to BS812-113 EN1097-8

Dorry Abrasion Machine to BS812-113 EN1097-8
for Aggregate Abrasion Value to EN 1097-8, BS 812:3 
CodeAG170
British StandardBS812-113
Other StandardsEN1097-8
Weight (kg)190
Tariff902480 90
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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 The Dorry Abrasion Test was superseded in 1951 by the current AAV test.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.

Test Procedure

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. 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 surfaces.

Features

  • 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

Supplied with

Two specimen moulds
Two flat plates
Two trays

Specification

Width 800mm
Depth 700mm
Height 1100mm
Volume (packed) 0.79 cubic metres
Weight 170kg
Electrical Supply 230V 50Hz 1ph

Click Click to view a PDF file of the User Guide

A user guide is available to download from the Impact web site www.impact-test.co.uk