00803831

Component

https://doi.org/10.3141/1728-08

https://doi.org/10.3141/1728-10

http://scholar.google.com...Hesp&publication_year=2000

A new class of reactive polymer modifiers designed to improve binder-aggregate adhesion in asphalt concrete was evaluated. Using a controlled free radical polymerization process, polyisoprene was prepared with short blocks of reactive amino- or silane-functional monomer at one end of the polymer chain. The reactive polymers so synthesized were tested with a modified version of the Tunnicliff-Root method (ASTM D4867) for measuring retained tensile strengths after water immersion moisture conditioning at 60 deg C for 24 h. It has found that the retained tensile strength of the unmodified samples was 53%, and the retained tensile strength of the regular polyisoprene-modified control samples was between 57 and 69%, depending on the polymer molecular weight and content. The best retained tensile strengths of 86 and 90%, respectively, were obtained with samples modified with 3 and 5% by weight of the higher-molecular-weight silane-functional polyisoprene. The method for obtaining the desired effect is flexible; lower-cost monomers, such as butadiene, and more common polymerization methods, such as emulsion or anionic polymerization techniques, may be used equally well to produce polymers with similar or better performance characteristics. An added benefit is that the tested polymers imparted significant improvements in low-temperature performance measured with the thermal stress restrained cooling test.

This paper appears in Transportation Research Record No. 1728, Asphalt Binders 2000.

English

p. 52-59

2000

Transportation Research Record

0309067316

Figures (4) ; References (38) ; Tables (2)

Adhesion; Asphalt concrete; Low temperature; Moisture damage; Molecular weight; Performance; Polymer asphalt; Polymers; Tensile strength

Mitigation; Moisture conditioning; Polyisoprene

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 7 2001 12:00AM

• CRACK PINNING IN ASPHALT MASTIC AND CONCRETE: REGULAR FATIGUE STUDIES
• DAMPING OF SHEAR VIBRATIONS IN ASPHALT MODIFIED WITH STYRENE-BUTADIENE-STYRENE POLYMER
• DISTRIBUTION OF STRAINS WITHIN HOT-MIX ASPHALT BINDERS: APPLYING IMAGING AND FINITE-ELEMENT TECHNIQUES
• EFFECT OF FILM THICKNESS ON RHEOLOGICAL BEHAVIOR OF ASPHALT BINDERS
• ESTABLISHING LINEAR VISCOELASTIC CONDITIONS FOR ASPHALT BINDERS
• EVALUATION OF MOISTURE SUSCEPTIBILITY OF ASPHALT MIXTURES: CONVENTIONAL AND NEW METHODS
• FACTORS AFFECTING VARIABILITY IN STRATEGIC HIGHWAY RESEARCH PROGRAM BINDER TESTS
• FIELD VALIDATION OF NEW SUPERPAVE LOW-TEMPERATURE BINDER SPECIFICATION PROCEDURE: PERFORMANCE DATA FROM PENNSYLVANIA TEST SECTIONS
• LOW-TEMPERATURE FRACTURE TESTING OF ASPHALT BINDERS: REGULAR AND MODIFIED SYSTEMS
• NEW CLASS OF REACTIVE POLYMER MODIFIERS FOR ASPHALT: MITIGATION OF LOW-TEMPERATURE DAMAGE