01661588

Component

The prediction of fatigue damage of bituminous materials has a great importance in the design of asphalt pavements. It is supposed to be accelerated by the combined action of environmental factors and repeated loading. Therefore, it is important to incorporate the environmental conditions in that predicting to ensure a proper design period of the in service pavement structure. This study aims to explore more about the combined effect of Long Term Oven Aging (LTOA) and moisture damage incorporating random rest periods on fatigue susceptibility of asphalt concrete mixtures. The influence of LTOA and moisture was simulated using British Board of Agrément (BBA) protocols and investigated using Indirect Tensile Fatigue Test (ITFT) in controlled strain mode. A 14 mm Dense Bitumen Macadam (DBM) mixture was manufactured using a 40/60 penetration asphalt binder and limestone aggregate. The results of ITFT at both testing temperatures 10°C and 20°C show a decrease in the fatigue resistance of control and LTOA asphalt mixtures after water immersion. Moreover, moisture reduces the stiffness recovery of these mixtures compared to those under dry conditions. On the other hand, there was an unexpected increase in the fatigue life of 14 mm DBM mixtures when these mixtures stiffen due to LTOA.

This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures.

18-05177

English

16p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Asphalt concrete; Asphalt mixtures; Fatigue (Mechanics); Moisture damage

Indirect tensile test; Long term oven aging; Rest periods (Materials)

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-05177

TRIS, TRB, ATRI

Jan 8 2018 11:18AM