Chemical modification of asphalt

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:6288038

Ju, Ruei Fu

Desirable properties of asphalt pavements include high stability, flexibility, and durability. In order to achieve these properties, the asphalt should bind well with mineral aggregates and the properties of the resulting asphalt concrete should change as slowly as possible during service life. The interaction of water and asphaltic concrete under particular circumstances may cause stripping or loss of adhesion and consequential detachment of the asphalt from the aggregate. Use of aggregates treated with these polymer emulsions resulted in a much stronger bond at the asphalt-aggregate interface. Scanning electron microscope studies showed that a thin polymer film covers the aggregate surface. Ethylene-vinyl acetate copolymer resin 460, ethylene-vinyl acetate copolymer resin 240, styrene butadiene copolymer, cis-1,4-polybutadiene copolymer, and polyethylene were tested as additives. The effect of these on the resistance to permanent deformation and dynamic stiffness is described in this study. The chemical changes that occurred during weathering were also addressed. The effect of oxidation on aged asphalt was determined by measuring the change in infrared absorption with time of exposure. Antioxidants which are capable of decomposing peroxides were found to extend the durability of the asphalt. By observing the concentration of peroxy radicals during the course of a chemical process as indicated by electron spin resonance peak intensity, it was possible to obtain quantitative information on the interaction of antioxidants with peroxy radicals. Indications were obtained that antioxidants are not effective in reducing the brittleness of asphalt upon aging. The effect of six plasticizers on thermal and mechanical properties of asphalt was studied. In general, use of plasticizers resulted in lowered rigidity, increased ductility and increased toughness. Tricresyl phosphate was the most effective.

• Research Organization: Arizona State Univ., Tempe, AZ (USA)
• OSTI ID: 6288038
• Resource Relation: Other Information: Thesis (Ph.D)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIOXIDANTS
PERFORMANCE
ASPHALTS
MECHANICAL PROPERTIES
WEATHERING
COPOLYMERS
PLASTICIZERS
ABSORPTION SPECTROSCOPY
ADDITIVES
ADHESION
CHEMICAL REACTIONS
CONCRETES
DECOMPOSITION
DEFORMATION
DEPOSITION
DUCTILITY
ELECTRON SPIN RESONANCE
EMULSIONS
FILMS
FLEXIBILITY
FRACTURE PROPERTIES
GRANULAR MATERIALS
INFRARED SPECTRA
OXIDATION
PAVEMENTS
PEROXIDES
RESINS
SCANNING ELECTRON MICROSCOPY
STABILITY
WATER
WEAR
BITUMENS
BUILDING MATERIALS
COLLOIDS
DISPERSIONS
ELECTRON MICROSCOPY
HYDROGEN COMPOUNDS
MAGNETIC RESONANCE
MATERIALS
MICROSCOPY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
RESONANCE
SPECTRA
SPECTROSCOPY
TAR
TENSILE PROPERTIES
360603* - Materials- Properties
400201 - Chemical & Physicochemical Properties