01687976

Component

http://www.trb.org/Main/Blurbs/178401.aspx

Decreasing in-place air voids in asphalt mixtures will reduce in-place asphalt mixture permeability and thereby increase asphalt pavement durability. However, when decreasing in-place air voids it is imperative that good mechanical mixture properties not be sacrificed. This research proposes to alter the standard mixture design procedure to determine optimum binder content at 5% air voids, rather than 4%, and then compact the resulting mixtures to 5% in-place air voids (95% Gmm density), rather than the more typical 7% to 8% in-place air voids (92% to 93% Gmm density) during construction. The experimental results of the project indicate that asphalt mixtures can indeed be designed by choosing optimum asphalt binder content at 5% air voids without lowering the effective binder content lower than mixtures designed using the standard Superpave mixture design method. Additionally, these 5% air void mixtures can have mechanical properties equivalent to the standard mixtures. Thus no rutting performance should be lost while mixture durability should be increased.

01685369

English

pp 77-85

2018-10

Transportation Research Circular

Digital/other

Figures; Photos; Tables

Air voids; Asphalt mixtures; Asphalt pavements; Bituminous binders; Compaction; Mix design; Rutting

Highways; Materials; Pavements

TRIS, TRB, ATRI

Nov 27 2018 10:53AM

• Application of Performance Tests During Asphalt Mixture Design: Louisiana’s Approach
• Balanced RAP–RAS–Recycling Agent Mix Design for Project-Specific Conditions
• Development and Implementation of the Illinois Flexibility Index Test: A Protocol to Evaluate the Cracking Resistance of Asphalt Mixtures
• Evaluating Balanced Mixture Design for New Jersey to Enhance Asphalt Mixture Durability
• Optimized Mix Design Approach: Contractor’s Perspective