01518596

Component

This paper presents the results of laboratory and field evaluation of warm mix asphalt (WMA) in Brazil, in comparison with conventional hot mix asphalt (HMA). A gap-graded gradation prepared with asphalt-rubber was tested using a surfactant additive for WMA. Resilient modulus, indirect tensile strength, rutting and moisture-induced damage tests were carried out in laboratory. Moreover, a project with two different sections was constructed and monitored with those asphalt mixtures as wearing courses, in which WMA section was constructed using typical practices (with the exception of temperatures) so as to evaluate it under usual construction conditions, especially considering the use of asphalt-rubber. After two years of traffic, deflections, distresses and skid resistance were verified in order to evaluate the pavement condition. Additionally, an estimate of energy savings with WMA was also calculated, considering some conditions observed in the field. Furthermore, emissions of polycyclic aromatic hydrocarbons (PAH) were also compared between WMA and HMA in laboratory and in the field. Laboratory and field results showed that WMA presented similar behavior to HMA, but with the benefit of energy savings and reduced PAH emissions.

This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures. Alternate title: Laboratory and Field Evaluation of Warm-Mix Asphalt in Brazil.

01503729

14-4917

English

15p

2014

Transportation Research Board 93rd Annual Meeting

Digital/other

Figures; Photos; References; Tables

Asphalt rubber; Field tests; Hot mix asphalt; Laboratory tests; Pavement performance; Warm mix paving mixtures

Brazil

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

Transportation Research Board Annual Meeting 2014 Paper #14-4917

TRIS, TRB, ATRI

Jan 27 2014 3:43PM