LOS ANGELES ABRASION MACHINE

DESCRIPTION

The Los Angeles Abrasion Testing Machine we have for sale consists of a hollow steel cylinder, closed at both ends, having an inside diameter of 28″ and inside length of 20″. The cylinder is mounted on stub shafts attached the ends of the cylinder but not entering it and mounted in such a manner that it may be rotated about its axis in a horizontal position. An opening in the cylinder is provided for the introduction of the test sample. The opening can be closed dust-tight with the removable cover bolted in place. The cover is so designed as to maintain the cylindrical contour of the interior surface.
The shelf is so located that the charge will not fall in the cover or come in contact with it during the test.

A removable steel shelf projecting a radial 3- ½” into the cylinder and extending its full length is mounted along one element of the interior surface of the cylinder. The shelf is of such thickness and so mounted by bolts or other approved means to be firm & rigid. The position of the shelf is such that the distance from the shelf to the opening measured along the circumference of the cylinder in the direction of rotation is not less than 50″.
If the cover stops at the bottom in a difficult to reach location, jog the barrel by pushing the outer weight-plate forward then reverse and pull to jog the barrel to the desired position.

LOS ANGELES ABRASION TEST PROCEDURE

Place the test sample and the abrasive charge in the Los Angeles Abrasion Testing Machine and rotate the machine at a speed of 30 to 33 rpm for 500 revolutions. The machine shall be so driven and so counterbalanced as to maintain a substantially uniform peripheral speed. After the prescribed number of revolutions, discharge the material from the machine and make a preliminary separation of the sample on a sieve coarser than the No. 12 (1.70mm). Sieve the finer portion to a No. 12 sieve in a manner conforming to section 5.2 of ASTM Method C136. Test for sieve or screen analysis of fine and coarse aggregates. Wash the material coarser than the No. 12 sieve, oven dry at 221°F to 230°F (105°C to 110°C) to substantially constant weight and weigh to the nearest 1-G.

DETERMINATION OF LOS ANGELES ABRASION VALUE

Los Angeles Abrasion Test Procedure