01515067

Component

https://doi.org/10.3141/2444-01

The primary objective of this study was to propose a practical and consistent mix design procedure for foamed bitumen mixture (FBM). The main focus of the proposed methodology was the use of the gyratory compaction method. The study maximized the mix design parameters, such as mixing water content (MWC) and compaction effort. The study was initially carried out on FBMs with virgin limestone aggregate without reclaimed asphalt pavement (RAP) material, and a mix design procedure was proposed. The proposed methodology was validated on FBMs with 50% RAP and 75% RAP. Efforts were also made to optimize the foamed bitumen (FB) content in FBMs with and without RAP. Optimum MWC was achieved by optimizing mechanical properties such as indirect tensile stiffness modulus and indirect tensile strength (ITS-dry and ITS-wet). A rational range of 75% to 85% optimum water content was obtained by the modified Proctor test and found to be the optimum range of MWC that gave optimum mechanical properties for FBMs. The study used a gyratory compactor for FBM compaction and found that a unique, mixture-specific number of gyrations that was independent of the FB content could be established. The study also found that the presence of RAP influenced the design’s FB content: treating RAP as black rock in FBM mix design was not appropriate.

01552182

14-0416

English

pp 1–10

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295369

Print

Figures (9) ; References (29) ; Tables (2)

Bituminous materials; Foamed materials; Laboratory tests; Limestone aggregates; Mix design; Moisture content; Reclaimed asphalt pavements; Tensile strength

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

PRP, TRIS, TRB, ATRI

Jan 27 2014 2:13PM

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• Characteristics of Virgin and Recycled Asphalt Shingle Binder Blends: Rheological and Chemical Properties
• Development and Preliminary Validation of Integrated Local Microclimate Model for Numerical Evaluation of Cool Pavement Strategies
• Effect of Waste Engine Oil Residue on Quality and Durability of SHRP Materials Reference Library Binders
• Effects of Interaction Conditions on Internal Network Structure of Crumb Rubber–Modified Asphalts
• Emulsified Asphalt Residue Recovery and Characterization: Combined Use of Moisture Analyzer Balance and Dynamic Shear Rheometer
• Evaluating Aging Properties of Crumb Rubber and Styrene–Butadiene–Styrene Modified Binders: Using Double Logistic Master Curve Model
• High-Temperature Characterization of Highly Modified Asphalt Binders and Mixtures
• Impact of Freeze–Thaw Cycles on Mechanical Properties of Asphalt Mixes
• Innovative Testing Protocol for Evaluation of Binder-Reclaimed Aggregate Bond Strength
• Investigation of Tack Coat Failure in Orthotropic Steel Bridge Deck Overlay: Survey, Analysis, and Evaluation
• Quantification of Water in Asphalt by Karl Fischer Titration and Its Application to Emulsion Recovery
• Sensitivity of Nozzle-Based Foamed Asphalt Binder Characteristics to Foaming Parameters
• Thermal Properties of Thermochromic Asphalt Binders by Modulated Differential Scanning Calorimetry
• Turning Back Time: Rheological and Microstructural Assessment of Rejuvenated Bitumen
• Vacuum Sealing-Based Volumetric Density Measurement Approach for Cold In-Place Recycling