ABSTRACT
ABSTRACT: To monitor field ageing of bitumen and hot mix asphalt closely, a test field has been constructed in September 2012. The test field consists of two mixes, an asphalt concrete with 11 mm maximum nominal aggregate size (AC 11) with an unmodified 70/100 pen and an SBS-modified PmB 45/80-65. Pavement temperature and weather conditions are recorded continuously. First HMA samples were taken from the test field after 6 and 12 months. The low-temperature performance by cooling (TSRST) and Tensile Strength Testing (UTST), as well as the viscoelastic behavior (dynamic modulus |E*| and phase lag ϕ) with temperature and frequency sweep are obtained. Results from unaged and field-aged specimens are compared. In addition, bitumen was extracted and recovered from HMA slabs to investigate field ageing. Penetration, Softening Point Ring & Ball, DSR tests with temperature and frequency sweep and BBR tests were run on fresh binder, lab-aged and field-aged samples.
