01550066

Component

https://doi.org/10.3141/2505-03

The study reported in this paper assessed the effects of stress levels on the creep and recovery behavior of modified asphalt binders with the same continuous performance grades (PGs). The modifiers included styrene–butadiene–styrene (SBS) and polyphosphoric acid (PPA). The multiple stress creep and recovery (MSCR) test was applied at 55°C and 70°C and at the PG temperature of each binder to consider a wide range of high temperatures. To further explore the role of applied stresses, the stress of 12.8 kPa was selected as an addition to the MSCR standard procedure. The nonrecoverable compliance (J<subscript>nr) and the percentage recovery (R) were calculated at each stress cycle. Comparison of the J<subscript>nr values between the corresponding SBS and PPA binders showed that, for the whole temperature range considered, the addition of a higher stress level to the MSCR standard procedure was necessary to increase the stress sensitivities and also to depict the nonlinear behaviors of the modified binders more clearly, especially for the PPA ones. Moreover, the R values showed that, at the PG temperatures of the binders, performance of the MSCR standard procedure made it possible to differentiate between the SBS and PPA binders with similar continuous PGs. At testing temperatures lower than the PGs, a higher stress level should be added to the MSCR standard procedure to differentiate between the elasticity of the corresponding SBS and PPA binders. At temperatures higher than the PGs, stress levels lower than 3.2 kPa should be applied to avoid negative recovery values.

01587029

15-0653

English

pp 15–23

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369312

Print

Figures (4) ; References (31) ; Tables (2)

Bituminous binders; Creep; Mechanical relaxation; Stresses; Styrene butadiene styrene

Multistress creep and recovery test; Performance grades; Polyphosphoric acid

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 30 2014 12:19PM

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