Evaluation of mix ingredients on the performance of rubber-modified asphalt mixtures

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5487346

Takallou, H B

In rubber-modified asphalt pavements ground recycled tire particles are added to a gap-graded aggregate and then mixed with hot asphalt cement. In view of the significant reductions in wintertime stopping distances under icy or frosty road surface conditions, the use of coarse rubber in asphalt pavements should be seriously considered. This research project consisted of a laboratory study of mix properties as a function of variables such as rubber gradation and content, void content, aggregate graduation, mix process, temperature, and asphalt content. Twenty different mix combinations were evaluated for diametral modulus and fatigue at two different temperatures. Also, five different mix combinations were evaluated for static creep and permanent deformation. The findings of the laboratory study indicate that the rubber gradation and content, aggregate gradation, and use of surcharge during sample preparation have considerable effect on modulus and fatigue life of the mix. The results of static creep and permanent deformation tests indicate that the rubber asphalt mixes had low stability and high elasticity. Also, due to greater allowable tensile strain in rubber-modified mixtures, the thickness of the modified mixture can be reduced, using a layer equivalency of 1.4 to 1.0

• Research Organization: Oregon State Univ., Corvallis, OR (USA)
• OSTI ID: 5487346
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
ASPHALTS
BENCH-SCALE EXPERIMENTS
BITUMENS
CHEMICAL PROPERTIES
CREEP
DEFORMATION
DIMENSIONS
DISPERSIONS
ELASTICITY
FATIGUE
FRICTION FACTOR
MECHANICAL PROPERTIES
MIXTURES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PAVEMENTS
PERFORMANCE
PERFORMANCE TESTING
QUANTITY RATIO
SERVICE LIFE
STABILITY
TAR
TENSILE PROPERTIES
TESTING
THICKNESS
TIRES
WASTE PRODUCT UTILIZATION