NMR on the Road: Non-destructive Characterization of the Crumb-Rubber Fraction in Asphalt
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Crumb rubber is used in asphalt to improve its long-term performance. Its fraction and distribution are key factors determining the quality of pavements with rubber-modified asphalt. It is shown how the rubber fraction and the heterogeneity of the pavement can be assessed non-destructively by single-sided NMR relaxometry with the NMR-MOUSE. The methodology employs laboratory-based calibration curves from reference samples and has been tested with field measurements on ten different roads. This work is the first of its kind and reports a significant step forward towards improved, non-destructive quality control of rubber-modified asphalt pavements.
The authors wish to thank CBL Industrial Services and the Departments of Transportation in the USA for the support of this project. Moreover, we are grateful to our colleagues M. Küppers and M. Adams at RWTH Aachen University for technical support and to our partners E. Bruton and J. Lively at CBL Industrial Services, for technical support and arrangement of the field tests.
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