Los Angeles Test :- Los Angeles test was developed to overcome some of the defects found in Deval test Los Angeles test is characterised by the quickness with which a sample of aggregate may be tested. The applicability of the method to all types of commonly used aggregate makes this method popular.
The test involves taking specified quantity of standard size material along with specified number of abrasive charge in a standard cylinder and revolving it for certain specified revolutions.
The particles smaller than 1.7 mm size is separated out. The loss in weight expressed as percentage of the original weight taken gives the abrasion value of the aggregate. The abrasion value should not be more than 30 percent for wearing surfaces and not more than 50 percent for concrete other than wearing surface.
