6506-7 - MARSHALL MIX DESIGN METHOD - Developed by Bruce...

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1 MARSHALL MIX DESIGN METHOD - Developed by Bruce Marshall & the U.S. Corps of Engineers. Objective : To determine the optimum asphalt content for a particular aggregate blend and asphalt to be used. PROCEDURES: 1. Prepare asphalt concrete specimens (4 inches in diameter & 2.5 inches in height) for a range of asphalt content at and near the estimated optimum asphalt content. (A) Mixing temperature: at asphalt viscosity of 170 ± 20 cSt (B) Compaction temperature: at asphalt viscosity of 280 ± 30 cSt (C) Compactive Effort: 35, 50 or 75 blows with a Marshall hammer (10 lbs, 18 inches drop) on each side of the specimen. (D) Number of Samples: 3 replicates at each asphalt content Typically, 5 different asphalt contents are used.
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2 BATCHING AGGREGATES FOR MAKING SPECIMENS ADDING ASPHALT TO AGGREGATE
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3 MIXING OF AGGREGATE AND ASPHALT PEDESTAL, HAMMER AND MOLDS FOR COMPACTION OF MARSHALL SPECIMENS
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4 Placing asphalt mixture in a compaction mold Placing a filter paper on asphalt mixture in compaction mold
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6506-7 - MARSHALL MIX DESIGN METHOD - Developed by Bruce...

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