6506-6 - EFFECTS OF AGGREGATE CHARACTERISTICS ON...

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1 EFFECTS OF AGGREGATE CHARACTERISTICS ON PERFORMANCE OF ASPHALT PAVEMENT Desirable Characteristics: 1. % L.A. Abrasion Loss < 45 - 50% L. A. ABRAISON TEST Purpose: Test for hardness or resistance to abrasion of aggregate. Procedure: 1. Run sieve analysis on test sample (usually 5000 g) to determine weight retained on #12 sieve (1.7 mm or 0.067 in.) 2. Place test sample in L.A. testing machine (rotating drum with metal balls inside. 3. Rotate the L.A. machine at a speed of 30 to 33 rpm for 500 revolutions. 4. L.A. Loss = Change in wt. Retained on #12 sieve X100% Original wt. Retained on #12 sieve
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2 L.A. Abrasion Machine L.A. Abrasion Machine
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3 Desirable Aggregate Characteristics (Continued) 2. Proper Gradation Fairly well graded, but not too well graded EXAMPLES OF AGGREGATE GRADATIONS
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EXAMPLE OF GRADATION BAND Desirable Aggregate Characteristics (Continued) 3. Larger Maximum Aggregate Size (produces greater rutting resistance) 4. Rough Surface Texture (preferred over smooth surface)
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6506-6 - EFFECTS OF AGGREGATE CHARACTERISTICS ON...

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