01552266

Component

In this paper the change in response behavior of bituminous mortars in relation to changes in production temperatures, traffic and environmental loads is investigated. The study is based on laboratory investigations on materials obtained from field at different inspection periods. The inspection period cover a period of one year made on two innovative Porous Asphalt (PA) test sections in The Netherlands. The PA in the first test section contains 3.2 mm long acrylic fibers. The PA in the second test section is produced using warm asphalt technology (Dutch Acronym, LEAB). A third section with standard PA is constructed to serve as a reference. From these sites, PA cores were drilled periodically for laboratory investigations. In each inspection period, samples were obtained from the Emergency lane and from the right wheel path of the slow lane. The effect of aging is investigated based on materials obtained from the Emergency lane. The combined effects of traffic and field aging were investigated using materials from the right wheel path of the slow lane. Analysis of mortar master curves obtained for different inspection periods provided insight on the evolution of the response with time. Results show significant aging started to take place as early as six month after construction. In this period it was found that the high temperature stiffness of the LEAB mortar has doubled. For the mortar with acrylic fiber, the stiffness increase is about three fold. The largest stiffness increase is observed for the standard mortar at about three and half fold. Differences in short term aging, oxidative aging, were also observed between the standard and the LEAB mortar. For the second inspection period, effects of aging on the master curve were minimal. The second inspection correspond to winter period. The effect of traffic on the master curve properties remains nuanced in all inspection periods. Global radiation data obtained from a weather station close to the test site support the laboratory findings. For the first year, no visual differences in field-performance has been observed between the three test sections.

This paper was sponsored by TRB committee AFK20 Characteristics of Asphalt Materials.

01550057

15-4149

English

14p

2015

Transportation Research Board 94th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Aging (Materials); Deterioration by environmental action; Laboratory studies; Mortar; Porous pavements; Shear modulus; Temperature; Test sections; Traffic loads

Netherlands

Design; Environment; Highways; Pavements; I15: Environment; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2015 Paper #15-4149

TRIS, TRB, ATRI

Dec 30 2014 1:21PM