impact AG 139, Руководство пользователя

Страница: 22 / 28

AGGREGATE ABRASION MACHINE
Introduction
Inadequate abrasion resistance of road surfacing aggregates means an early loss of
the texture depth required to maintain high speed skidding resistance.
The Aggregate Abrasion Machine provides engineers with a medium to test and
measure the resistance of aggregate to surface wear by abrasion. The Aggregate
Abrasion Value (AAV).
Determination of AAV
The AAV is a measure of the percentage loss, in mass, of chippings. The AAV
ranges from about 1 for hard flints, to over 16 for aggregates normally considered
too soft for use in road surfaces.
Machine Operation
Two specimens are pressed against the surface of a steel disc rotating in a
horizontal plane. Sand, fed by hoppers, is used as an abrasive. The disc is spun for
500 revolutions, as determined by a pre-set digital revolution counter. The amount of
material abraded is then measured by calculation of the weight loss of the
aggregate.
Electrical supply - 230V AC, Single Phase 50Hz.
Physical Data
Width 80
cms
Depth 70 cms
Height 110 cms
Volume
(packed) 0.79 cu
meters
Weight 170 Kg
Standard Accessories
2 Specimen Moulds - For manufacturing test samples.
2 Flat Plates - For levelling the test sample base.
2 Trays - For collecting spent abrasives.
Operating Instructions
- 20 -