6506-14 - SUPERPAVE VOLUMETRIC MIX DESIGN 4 MAJOR STEPS...

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1 SUPERPAVE VOLUMETRIC MIX DESIGN 4 MAJOR STEPS: STEP 1: Selection of materials A. Select asphalt binder PG grade based on maximum and minimum pavement temperatures for the specified reliability. B. Aggregates must meet the requirements for the four “Consensus Properties” ( Coarse Aggregate Angularity, Fine Aggregate Angularity, Flat and Elongated Particles, and Clay Content) and other “Source Properties” (Soundness, Toughness and Deleterious Materials, etc.) % particles with 2 or more crushed faces 0% Crushed 100% with 2 or More Crushed Faces Consensus Property 1: Coarse Aggregate Angularity Coarse Aggregate Angularity Criteria Traffic Depth from Surface Millions of ESALs < 100 mm > 100 mm < 0.3 0.3 to < 3 3 to < 10 10 to < 30 30 55/-- 75/-- 85/80* 95/90 100/100 --/-- 50/-- 60/-- 80/75 100/100 * First number denotes % with one or more fractured faces Second number denotes % with two or more fractured faces Fine Aggregate Angularity (Uncompacted Void Content of Fine Aggregate) * Fine aggregate at a specified gradation is allowed to flow freely into a 100 cm 3 cylinder. *Knowing the specific gravity of the aggregate, the voids between aggregate particles can be determined * Presumably, the more angular the aggregate, the higher the void content Consensus Aggregate Property 2: Uncompacted Void Content Test Uncompacted Void Content Test Natural sands: typically < 45 Manufactured sands: typically > 42
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2 Fine Aggregate Angularity Criteria Traffic Depth from Surface Millions of ESALs < 100 mm > 100mm < 0.3 0.3 to < 3 3 to < 10 10 to < 30 30 -- 40 45 45 45 -- 40 40 40 45 Flat and Elongated Particles • ASTM D4791 –F la t – Elongated • Superpave – Flat and Elongated are defined as having a minimum dimension
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This note was uploaded on 05/26/2011 for the course CGN 6505 taught by Professor Mang during the Spring '11 term at University of Florida.

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6506-14 - SUPERPAVE VOLUMETRIC MIX DESIGN 4 MAJOR STEPS...

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