• Model NO.：STDC-1
• Accuracy Grade：1
• Load Way：Electronic Load
• Loading Method：No
• Display：Digital
• Control：Digital Control
• Weight：211 Kg
• Power Source：AC380V
• Oil Cylinder Position：No
• Product Name：Aav Dorry Abrasion Machine
• Standard：BS812. PT. 113. 1990.
• Standard Accessories：2 No. - Flat Plates 2 No. - Trays
• Size：98X83X112cm
• Transport Package：Wooden Case
• Specification：98x83x112cm
• Trademark：SHTG
• Origin：China
• HS Code：9031809090
• Production Capacity：100PCS,Month

Basic Info.

Model NO. STDC-1 Accuracy Grade 1 Load Way Electronic Load Loading Method No Display Digital Control Digital Control Weight 211 Kg Power Source AC380V Oil Cylinder Position No Product Name Aav Dorry Abrasion Machine Standard BS812. PT. 113. 1990. Standard Accessories 2 No. - Flat Plates 2 No. - Trays Size 98X83X112cm Transport Package Wooden Case Specification 98x83x112cm Trademark SHTG Origin China HS Code 9031809090 Production Capacity 100PCS/Month

Product Description

STDC-1 AAV - Dorry Abrasion Machine Aggregate Abrasion Value Machine 
BS 812 Pt 113 1990

Specification:
The test provides a measure of the resistance of aggregate to surface wear by abrasion. The machine, formerly named "Dorry abrasion machine", consists of a circular cast iron grinding lap 600 mm dia. which rotates in a horizontal plane at a speed of 28/30 r.p.m. The abrasive sand is fed across the surface of the specimen samples through a special funnel. 
The machine is supplied complete with two specimen moulds, two trays, two flat plates, weights and clamps.

The machine is used to determine the resistance of aggregate to wear by abrasion.The test measures resistance of aggregates 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. Relevant British Standard BS 812 : Part 3 : 1990 Relevant European Standard EN 1097/8 : Part 8 Dorry Abrasion Test This was specified in an earlier version of BS 812, which was superseded in 1951 by the current AAV test. 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 0.365 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 surfacings. Related Test The PSV test (Polished Stone Value) requires an AAV determination when PSV is greater than 60.

A robust welded steel fabrication carry a steel lap wheel, mounted on a precision ground steel shaft, located in sealed ball bearings, driven from a grease filled totally enclosed reduction gearbox and driven by a v.belt drive calibrated to ensure correct speed of rotation from a resilient mounted electric motor. 
Twin specimens manufactured in steel moulds are located on the lap wheel and loaded to a specified weight. Abrasive material is fed on to the lap wheel from adjustable hoppers and after passing under the specimen is removed from the surface of the lap wheel and collected by rotating blades to a collecting hopper for re-cycling.

A predetermined counter is fitted as standard. 
 

StandarStandard d	BS812. Pt. 113. 1990.
Standard Accessories	2 No. - Specimen Moulds 2 No. - Flat Plates 2 No. - Trays
Finish	Powder coated and stove enamel. Details electro plated
Supply	220/240v 1Ph 50HZ (Alternatives available)
Size	98x83x112cm
Gross Weight	190 kgs