DORRY ABRASION TEST PDF

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Determination of Aggregate Abrasion Value The test gives a measure of 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.

Two specimens are pressed against the surface of a steel disc rotating in a horizontal plane, with a force of 0. Sand, fed by hoppers, is used as an abrasive. After 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. Width mm Depth mm Height mm Volume packed 0. BS, BS Toggle navigation. User Login Sign Up. Welcome, Guest Login. Quote Cart Items: 0. Code AG Ask a question about this Product.

Test Procedure Two specimens are pressed against the surface of a steel disc rotating in a horizontal plane, with a force of 0. Features Heavy duty mainframe on adjustable anti-vibration pads Steel lap wheel 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 mm Depth mm Height mm Volume packed 0.

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Dorry Abrasion Machine to BS812-113 EN1097-8

Inadequate abrasion resistance of road-surfacing aggregates means an early loss of the texture depth required to maintain high-speed skidding resistance. However, the name Dorry continues in common use, for this equipment - after 40years! Test Procedure Two specimens are pressed against the surface of a steel disc rotating in a horizontal plane, with a force of 0. Sand, fed by hoppers, is used as an abrasive. After 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 surfacings.

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Dorry Abrasion Testing Machine

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