Brand : GILSON,MATEST,HUMBOLDT,FORNEY,CHINA
Stok : In Stock
ASTM D6928, D7428; AASHTO T 327; TxDOT: 845-49-40;
The increasingly popular Micro-Deval test measures abrasion resistance and durability of fine and coarse mineral aggregates. An aggregate sample with an abrasive charge of up to 5,000g of 9.5mm diameter stainless steel balls and water, is placed in a sealed stainless steel jar then rotated at 100rpm for two hours. Aggregate quality is determined by percentage loss in gradation results at completion. Smaller equipment size, lower sample quantities and a simpler procedure make the Micro-Deval method easier and less costly to perform than other test methods. The MD-2000 meets current ASTM, AASHTO and Canadian test methods, as well as more stringent Texas DOT requirements. This contemporary version of the Micro-Deval test should not be confused with older versions originating in Europe which use different equipment and test protocol. A sophisticated electronic controller with optical sensing system accurately tracks test time, total revolutions and rpm of jars. Test duration is controlled by either elapsed time or total revolutions. Jars stop within a fraction of one revolution at test termination. Jar revolution and speed data may also be used as a verification of machine performance. The jars revolve behind Lexan™ doors with safety interlocks. No moving parts are exposed during operation. Other manufacturers use separate timers to control test duration, which does not permit tracking of jar revolutions or speed and allows variations up to ±6% of the optimum number of revolutions. In addition, other machines rotate the jars on unguarded open rollers, creating a potential safety hazard. The Micro-Deval is a two-tier unit with sturdy steel frame. Each tier rotates one stainless steel 5L jar, 194mm ID, 170mm internal height with locking cover. Power to the rubber-covered rollers is supplied by a thermally protected 3/4hp, electric motor through a gear transmission and chain drive. The unit is supplied with two jars and two sets of 5,500g abrasive charges. A magnet is included to assist in removing the abrasive charge after test completion. For additional sample preparation and increased sample testing capacities, order additional Jars HMA-920 and Abrasive Charge HMA-922. Add "F" to model number for operation on 230V/50Hz or "V" for 230V/60Hz power supply.
Product Dimensions: 20.5x13.5x38in (521x343x965mm), WxDxH
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