01124940

Component

The objective of the research was to determine the deformation characteristics of base material produced from recycled asphalt pavement (RAP) and aggregate. Cyclic triaxial tests were conducted at two deviator stresses, 35% and 50% of the estimated failure stress, to evaluate recoverable and permanent deformation behavior from initial loading to 5000 cycles. The specimens with RAP exhibited up to four times greater permanent deformation than the 100% aggregate material, and a steady state condition was reached after approximately 1000 cycles. This valuable information regarding the permanent deformation is not collected during a resilient modulus (MR) test, because the first 1000 cycles are used for conditioning only. As %RAP increased, more permanent deformation occurred. Young’s modulus (Esecant), which was computed in the same manner as MR, increased as the number of cycles increased. Initially, Esecant was larger for the 100% aggregate specimens, but after approximately 100 cycles the 25% aggregate – 75% RAP specimens had the highest Esecant. The cyclic tests at the 50% stress ratio exhibited greater permanent deformation by a factor of 2 – 3 compared to the 35% stress ratio tests, and Esecant was about 15% greater at the higher deviator stress.

01120148

09-1604

English

14p

2009

Transportation Research Board 88th Annual Meeting

DVD

Figures (9) ; References (9) ; Tables (3)

Aggregates; Asphalt pavements; Modulus of resilience; Pavement management systems; Recycled materials; Repeated loads

Permanent deformation

Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2009 Paper #09-1604

TRIS, TRB

Jan 30 2009 5:51PM