Abstract
In order to investigate and improve the detection level of ductility of asphalt of laboratories, proficiency testing provider PT0031 (CNAS) has organized a proficiency testing program of ductility of asphalt of CNCA, and 87 laboratories from 21 provinces/cities/municipals and Taiwan took part in this PT. This work introduced the implementation process of proficien-cy testing for determination of ductility of asphalt, including the sample preparation, homogeneity and stability test, and the results of statistics of iteration robust statistic technique and analysis, summarized and analyzed different test standards widely used in the laboratories, and put forward the technological suggestions for the improvement of test quality of ductility. Satisfactory results were obtained by 85 laboratories, amounting to 97.7% of the total participating laboratories.
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