Centrifuge rotarex evaluation in content binder and granulometry determination of different asphalt concrete
DOI:
https://doi.org/10.14295/transportes.v28i1.1841Keywords:
Quality assurance. Asphalt mixture. Asphalt content. Granulometric analysis.Abstract
This article evaluated the determination of binder content and sieve analysis of asphalt mixtures, using the binder extraction method by Rotarex centrifugation. It was employed in this study two granulometric ranges, six different rocks, three binder contents, CAP 50-70 and PMB 60/85-E-SBS and solvent trichloroethylene, evaluating their influence in the results of binder content and gradation through statistical analysis: standard deviation, absolute error and ANOVA. In this researching, the binder content obtained through centrifugation showed a low liability. The values of standard deviation and absolute error extrapolated the limit of 0.3% of DNIT binder content variation for the production of asphaltic concretes, questioning the centrifuge as a methodology to be used in production and quality control. The mean absolute error of the binder content showed to be inversely proportional to the employed binder content itself, so it was not possible to achieve a calibration factor. These uncertainties are connected to the inefficient asphalt extraction and a high susceptibility data. The sieve analysis was equally influenced by an incomplete binder extraction by centrifugal, which the fine material accumulation to the non-extracted binder caused distortions to the granulometric analysis. In several mixtures, the curves mistakenly extrapolated the limits of grading.Downloads
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