Tests for resistance to abrasion in crushed rock, slag, crushed and uncrushed gravel, using Los Angeles testing method. Features welded structural steel frame, fabricated 1/2”-thick (913mm) abrasion-resistant steel drum, removable shelf bolted to drum and balanced drum assembly for easy rotation by hand.
Enclosed chain drive rotates drum without conventional slip clutch. Positive drive delivers greater accuracy. Self-contained worm-drive motorized speed reducer has anti-friction bearings and sealed lubrication. Motor is 1HP (746W), equipped with magnetic pushbutton control and automatic overload cutout. Includes revolution counter, material catch pan, set of 12 standard abrasion charges. Dimensions: 39x29x37”. 115V. 60Hz. 1 ph. AC. Meets ASTM C131, C535; AASHTO T96.
Replacement Steel Charges 12/set (HMA-130)
MD-2000 Micro-Deval Apparatus
The increasingly popular Micro-Deval test measures abrasion resistance and durability of mineral aggregates in the 9.5 to 19mm size range. In practice, a presoaked coarse aggregate sample is placed in a sealed stainless steel jar with a 5000g abrasive charge of 9.5mm diameter stainless steel balls and water, then rotated at 100 rpm for two hours. Aggregate quality is determined by percentage loss in gradation results at completion of the cycle. Smaller equipment size, lower sample quantities and a simpler procedure make the method easier and less costly to perform than traditional methods. A provisional AASHTO standard is currently in effect and an ASTM specification is under development. The MD-2000 meets current Canadian and provisional AASHTO standards, as well as more stringent Texas DOT requirements.
SS-18 Durability Index Apparatus
Durability Index measures relative resistance of an aggregate to producing clay-like fines when subjected to mechanical agitation in a special washing vessel. Resulting fines material is evaluated using sand equivalent apparatus listed elsewhere. The versatile SS-18 Agitator runs at 285 CPM. It may also be used as a sieve shaker for up to 6 sieves and pan when not used for durability tests. Holes are provided in case flanges for securing shaker to floor or bench. Switch, cord, and plug are provided; order timer and wash vessel separately. The SSA-22 stainless steel wash vessel is approx. 8" diam. x 9-1/2" high and is complete with lid, gasket, and clamps. Agitator measures 16x14x30" WxDxH.
