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Determination of Resistance to Fragmentation by the LOS Angeles Test Method
Engineering and Construction
Pages 5 (1255 words)
Determination of Resistance to Fragmentation by the LOS Angeles Test method Objectives 1. The resistance to fragmentation serves as a reference to hardness and strength of the aggregate. 2. The LOS Angeles Test results like all other tests provides the recommendation to the engineer, firstly whether to use it or not and if it can be used then which layer of the pavement it can be used in.
4. Compare the results of the test with the specifications and diagnose there appropriate use. Apparatus The apparatus that are used for this test are as follow and these all conform to the BSI standard “BSI. (1998-2006)EN 1097-2.. Tests for mechanical and physical properties of aggregates ? Part 2: Methods for the determination of resistance to fragmentation”. 1. Electronic Weighing Balance with a precision of 0.1 g 2. Test sieves used for los Angeles Test are of the aperture sizes of 1.6 , 10, 11.2/12.5 & 14 mm. 3. Los Angeles Apparatus with all parts and mechanisms. 4. 11 Spherical ball loads/charges with diameter of atleast 45 mm and atleast total weight of 4690g. 5. Miscellaneous apparatus for assistance in movement of material during the test. Procedure 1. The first step would be sampling and preparation of test specimen according to the that mentioned in the standards. BSI. (1998-2006) EN 1097-2dictates that an initial separation is done by sieve of 10mm and sieve no 14mm. Then from this acquired sample another specimen is produced which contains about 60-70% of passing of 12.5mm sieve and 30-40 % of passing of 11.2 mm sieve. 2. ...
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