01664086

Component

Transportation sector is a major contributor to global greenhouse gas emissions; this has encouraged the development of pavement materials that decrease the energy demand from travelling vehicles by reducing the rolling resistance of the pavement surface. This paper examines the performance of three stone-matrix asphalt (SMA); one reference material, and two specially designed COOEE mixes. These mixes are part of the project “CO2 emission reduction by exploitation of rolling resistance modeling of pavements” (COOEE) in Denmark. The project’s main objective is to reduce roadside emissions by improving pavement-energy efficiency. The proposed mixes were tested to evaluate their potential performance with respect to the impact on rolling resistance. A dynamic modulus test was performed to characterize the viscoelastic behavior of the mixes, the Illinois flexibility index test was performed to assess their cracking susceptibility, and the mixes’ rutting potential was evaluated through the Hamburg wheel track test. Results show that the COOEE mixes have relatively lower modulus at low temperatures but higher modulus at high temperatures, which is desirable, compared to the reference material. COOEE mixes with richer mastic and larger aggregate size exhibited a high flexibility index (FI). All COOEE mixes experienced very low rutting, even at 6.0% air voids, compared to the reference material. An interaction analysis between rut depth and FI showed COOEE behavior to be both stiff and flexible; indicating the mixes are identical for providing adequate crack and rutting resistance, given proper field construction, quality control, and quality assurance.

This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures. Alternate title: Laboratory Characterization of Low-Rolling Resistance Danish Stone-Matrix Asphalt

18-03180

English

5p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

References; Tables

Asphalt mixtures; Dynamic modulus of elasticity; Exhaust gases; Laboratory tests; Pavement performance; Performance tests; Rolling resistance; Rutting; Stone matrix asphalt; Temperature

Hamburg Wheel Rut Tester; Illinois Flexibility Index Test

Denmark

Environment; Highways; Materials; Pavements; I30: Materials

Transportation Research Board Annual Meeting 2018 Paper #18-03180

TRIS, TRB, ATRI

Jan 8 2018 10:46AM