Evaluation of DASR-IC parameters and their influence on the fatigue life of asphalt mixtures
DOI:
https://doi.org/10.14295/transportes.v29i4.2017Keywords:
Asphaltic pavements, Mixtures, Fatigue, Damage, ModelingAbstract
Among the most common distresses in pavements are rutting and fatigue cracking of HMA (Hot Mixture Asphalt) used in surface courses. These defects still lack simple and consistent laboratory methodologies capable of indicating HMA characteristics for higher performance. There are theories that contribute, still in the design phase, to the selection of aggregate gradation and other parameters, to produce HMAs with greater capacity to withstand field distresses. The DASR-IC (Dominant Aggregates Size Range, considering Interstitial Components) is a promising gradation selection methodology. The present work aims to evaluate the capacity of 6 HMAs, evaluating whether those that meet the criteria of the investigated methodology have superior performance with respect to fatigue cracking. Mixtures from a database of 54 HMAs were selected, so that the first mixture did not meet any of the mentioned criteria and, gradually, the investigated parameters met the required criteria. After laboratory tests and fatigue life simulations, it was concluded that HMAs that met most of the parameters from the DASR-IC methodology presented greater fatigue resistance.
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