01124952

Component

https://doi.org/10.3141/2126-09

http://scholar.google.com...ngre&publication_year=2009

The rheological properties of asphalt binders modified by styrene–butadiene–styrene (SBS) depend on formulation variables. The most sensitive of them may be listed as polymer amount, cross-linking agent amount (percentage), and other additives such as polyphosphoric acid (PPA). The dispersion of SBS in an asphalt binder depends on the time and temperature of blending and the base asphalt binder compatibility. In this study an incompatible binder and a compatible base asphalt binder were selected and modified with various amounts of SBS. Elemental sulfur was used as a cross-linking agent in different proportions. Other additives, such as PPA at 0.5% concentration, were also used. High shear blends of SBS-modified asphalt binders were made in the laboratory by varying blending time until an optimum dispersion of polymer was obtained. The dispersion of the polymer was studied with a fluorescence microscope. A multiple stress creep and recovery (MSCR) test was used to study creep and recovery behavior of these modified binders. MSCR test results (J sub nr and percentage recovery) were able to characterize the extent of dispersion of SBS in these polymer-modified asphalts (PMA). This implies that a fundamental test method is now available to discriminate between the dump-and-stir types of PMAs and those that have been optimally dispersed. This presentation discusses the effect of SBS dispersion and other additives on the MSCR test results.

01147489

09-3157

English

pp 73-82

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309142564

Print

Figures (8) ; References (6) ; Tables (5)

Additives; Bituminous binders; Blending; Polymer asphalt; Styrene butadiene styrene; Sulfur

Creep and recovery tests; Fluorescence microscopy; Polyphosphoric acid

Highways; Materials; I31: Bituminous Binders and Materials

PRP, TRIS, TRB, ATRI

Jan 30 2009 7:33PM

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• Comparison of Asphalt Rubber and Conventional Mixture Properties: Considerations for Mechanistic–Empirical Pavement Design Guide Implementation
• Determining Intrinsic Healing Properties of Asphalt Binders: Role of Dynamic Shear Rheometer
• Effect of Crumb Rubber Bituminous Mixes on Functional Characteristics of Road Pavements
• Effects of Warm-Mix Asphalt Additives on Workability and Mechanical Properties of Reclaimed Asphalt Pavement Material
• Evaluation of Bond Strength of Tack Coat Materials in Field: Development of Pull-Off Test Device and Methodology
• Evaluation of Warm-Mix Asphalt Produced with the Double Barrel Green Process
• Field and Laboratory Forensic Analysis of Reflective Cracking on Massachusetts Interstate 495
• Investigation of Fiber-Modified Bituminous Mixes
• Laboratory and Field Evaluations of Foamed Warm-Mix Asphalt Projects
• Laboratory Investigation of Moisture Damage in Warm-Mix Asphalt Containing Moist Aggregate
• Modeling of Repeated Creep and Recovery Experiments in Asphalt Binders
• Performance of Polymer-Modified Asphalt Mixture with Reclaimed Asphalt Pavement
• Testing of Moderate and High Reclaimed Asphalt Pavement Content Mixes: Laboratory and Accelerated Field Performance Testing at the National Center for Asphalt Technology Test Track
• Virginia’s Higher Specification for Reclaimed Asphalt Pavement: Performance and Economic Evaluation