01659012

Component

Significant energy consumption in the road-transport sector can be associated with rolling resistance (RR) between tire and pavement. Tire dynamic deformation and relative RR, due to texture characteristics and longitudinal unevenness, are considered the largest contributors to energy use and, hence, greenhouse gases. In addition, pavement structure can also be important for heavy vehicles. In Denmark, the CO₂ emission from road transport alone has been quantified as 4.6 Mt/yr. It is expected that implementing durable, low-RR pavements on the entire 4,000 km of state roads in Denmark would provide a reduction in CO₂ emission by 160 kt/yr. Since 2012, the Danish Road Directorate has worked on implementing stone-mastic asphalt (SMA) as a wearing surface for possibly reducing RR between vehicles and road pavements. In 2016, a test section was paved in Kalvehave, where two low-RR SMAs were compared to a reference asphalt concrete (AC) mixture. To evaluate the texture durability, the three mixtures were sampled at the construction site and tested with the circular road tester (CRT). The CRT is an accelerated load facility used to study changes in surface properties due to tire passes. The experiment was performed under various climate-condition simulations to evaluate the effect of changes in surface characteristics such as permanent deformation, texture depth, and texture negativity. The collected results have shown that durability of low-RR pavements can be enhanced by using premodified binder which reduces changes in textural properties and increases rutting resistance.

This paper was sponsored by TRB committee AFD90 Standing Committee on Pavement Surface Properties and Vehicle Interaction.

18-02373

English

6p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Carbon dioxide; Energy consumption; Flexible pavements; Greenhouse gases; Rolling resistance; Rutting; Stone matrix asphalt; Texture

Accelerated loading facilities

Denmark; Kalvehave (Denmark)

Highways; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-02373

TRIS, TRB, ATRI

Jan 8 2018 10:34AM