Lecture9_superpave_mix_design_2

Lecture9_superpave_mix_design_2 - 1 SuperPave Mix Design 1...

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Unformatted text preview: 1 SuperPave Mix Design 1 New Superpave P erformance G raded Specification Some slides are courtesy of FHWA Marshall Mix Design Developed by Bruce Marshall for the Mississippi Highway Department in the late 30s Mix design steps: Select and test aggregate Select and test asphalt cement Establish mixing and compaction temperatures Develop trial blends Heat and mix asphalt cement and aggregates Compact specimen (100 mm diameter) Marshall Hammer - Stability and Flow Stability Device Automatic Hammers 2 Marshall Design Use of Data Air Voids, % Stability Unit Wt. 4% Asphalt Content, % Asphalt Content, % Asphalt Content, % Target optimum asphalt content = average 4% Marshall Design Use of Data Flow VMA, % Lower Limit Upper limit Minimum OK OK Asphalt Content, % Asphalt Content, % Use target optimum asphalt content to check if these criteria are met Marshall Mix Design Advantages attention to volumetric properties for durability equipment inexpensive and portable Disadvantages impact compaction unrealistic Marshall stability not related to performance 3 Hot-Mix Asphalt Mix Design Superpave Volumetric Design 7 SuperPave Mix Design Objectives: Compaction method which simulates field Accommodates large size aggregates 8 Measure of compactibility Able to use in field labs Address durability issues Film thickness Environmental SuperPave Mix Design Developed by the SHRP Program in the mid 1990s Mix design steps: Select and test aggregate Select and test asphalt cement...
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This note was uploaded on 06/22/2009 for the course CM 3400 taught by Professor Hassan during the Spring '09 term at LSU.

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Lecture9_superpave_mix_design_2 - 1 SuperPave Mix Design 1...

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