Los Angeles Abrasion Value

LOS ANGELES ABRASION VALUE This method describes the procedure for the determination of the Los Angeles simoleons Value of aggregate APPARATUS Australian Standard sieves (Grade B) as required. 1 2 A thermostatically controlled oven with good air ventilation undecided of maintaining a temperature within the range of one hundred fiveC to 110C. 3 Sieve brushes. 4 Balance readable and accurate to at least(prenominal) one gram. 5 Sample divider of the multiple slot type. A suitable design is shown in Figure 1. 6 Los Angeles Machine requisite dimensions complying with Figure 2.Worksheet, MRD 1165 (recommendation only) 7. PROCEDURE 1 Obtain a tryout sample taken in accordance with Test Method WA200. 1. 2 Select a grading defined in evade 1 subdue to the particle size distribution of the test sample. 3 lap the test sample by agitation under running urine for approximately ten minutes. 5 Dry the test sample to unvarying mass (Note a), in an oven at a temperature within the range of 105C to 110C, cool to room temperature and sieve it on the appropriate sieves until a sufficient mass of each fraction has been obtained.Adjust the mass of textile so obtained for each sieve fraction by quartering or riffling, if necessary, to within two percent of the relevant mass shown in Table. 1. hold back the mass of each fraction and combine the sieve fractions to form a test portion ), to at least the nearest 1g, of the test portion. dimension it, together with the appropriate ball charge defined in Table 1, in the Los Angeles Machine. Rotate the machine for 500 or 1 000 revolutions as required in Table 1 (Note b).