Lecture8_superpave_mix_design_1

Lecture8_superpave_mix_design_1 - SuperPave Mix Design New...

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1 SuperPave Mix Design 1 New Superpave P erformance G raded Specification Some slides are courtesy of FHWA Hot Mix Asphalt (HMA) Mix Design ± Objective: ± Develop an economical blend of aggregates and asphalt that meet design requirements ± Historical mix design methods ± Marshall Marshall ± Hveem ± Texas Gyratory Mix Design ± New ± SuperPave mix design Volumetric Analysis ± All matter has mass and occupies space. ± Volumetric analysis is a way of evaluating the relationships between mass and volume
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2 VMA Vol air Vol eff asph Mass air = 0 Mass asph VOLUME MASS air asphalt Phase Diagram Unit Volume Bulk vol aggr Mass aggr aggregate Total Mass absorbed asphalt Effective vol aggr Vol abs asph HMA Volumetric Terms ± Total and Effective Asphalt Content (P b and P be ) ± Bulk specific gravity of compacted HMA (G sb ) ± Bulk specific gravity of asphalt (G b ) ± Effective specific gravity of aggregate (G se ) ± Maximum specific gravity of HMA (G mm ) ± Air voids (V a ) ± Voids in mineral aggregate, VMA ± Voids filled with asphalt, VFA Aggregate Bulk Specific Gravity, SSD Bulk Volume = solid volume + G sb = Dry Mass Bulk Vol 1.000 g/cm 3 water permeable pore volume Solid Aggr Particle water permeable pore volume “SSD” Level
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3 Aggregate Apparent Specific Gravity Apparent Volume = volume of solid G sa = Dry Mass App Vol 1.000 g/cm 3 Apparent Volume = volume of solid
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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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Lecture8_superpave_mix_design_1 - SuperPave Mix Design New...

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