Interlaboratory tests of paving grade bitumen and polymer modified bitumen

In the paper the results of interlaboratory round-robin tests are presented. The RR program was executed for paving grade 50/70 bitumen and polymer modified bitumen 45/80-55. For both binders similar test programs have been prepared, starting from fundamental properties like Pen@25, Softening Point, Softening Point after RTFOT, Fraass breaking point, elastic recovery etc. and with use of more contemporary test methods as complex modulus G*, phase angle delta(60 degrees C, f = 1.59 Hz (10 rad/s), PMB microstructure etc. Finally 8 properties for unmodified bitumen were tested and 9 for PMBs. In the program 24 laboratories from three european countries participated representing different kinds of labs - private owned, technical universities, road administration and refinery control labs. The final results were evaluated with statistical and z-score method. Surprisingly results showed that the best methods with high reproductibility are complex modulus G* and phase angle d.