LA Abrasion - Put aggregate and charges in the abrasion...

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ASTM C 131 Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine Equipment Los Angeles Machine Sieves Balance Charge Sampling Depends on the grade of the aggregate. In this case, grading b will be used. It is described below in detail. Procedures 1. Wash and oven dry a reduced sample. The sample should be 2500 g from the 1/2” sieve, 2500 g from the 3/8” sieve. 2. Separate and record mass retained for each sieve according to grade. Record mass to the nearest 1 g. 3.
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Unformatted text preview: Put aggregate and charges in the abrasion machine. The machine should revolve between 30-33 revolutions/minute for 500 revolutions. For this sample size, 11 spheres should be used. 4. Sieve on a No. 12 sieve. 5. Wash the coarser material and dry. Determine the mass to the nearest 1 g. 6. Calculate the loss as a percentage of the original mass. Calculations • Percent Loss original final original Loss M M M-= % Significance and Use • This test is used to indicate the quality of the aggregate and it’s resistance to drum work....
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