Effects of using reclaimed asphalt and/or lower temperature asphalt on availability of road network

Effects of reclaimed asphalt and warm mix asphalt on the availability of the road network

“…The site properties of international roughness index (IRI), mean profile depth (MPD) and corrected SCRIM Coefficient (SC) were monitored initially and after 6 months, 12 months (Nicholls et al 2014) and 23 months (Nicholls et al 2015). No measurements were made at 40 months because of the short notice given for the second project extension and because the surface had been disrupted by the extraction of so many cores, particularly for measuring IRI on the remaining surface.…”

“…However, there were indications that the material had undergone densification due to traffic loading and ageing of the binder, with the possibility of densification being supported by the increased bulk density of extracted cores and the ageing being supported by the increased stiffness and tensile strength over the limited time that the trial was monitored. The mechanical properties of indirect tensile stiffness modulus (ITSM) and indirect tensile strength ratio for water sensitivity were measured on cores extracted initially and after 12 months (Nicholls et al 2014) and 23 months (Nicholls et al 2015). The results showed that the water sensitivity test on Mixture 3 (40 % RA with additive) failed to meet the 80 % threshold, dropping from 87.6 % after 12 months to 77.6 % after 23 months.…”

“…All the results were compared with the unaged ITS result of the cores taken at that time; as such, these ratios were not the same as the usual ITSR values with a standard soaking period. These tests were carried out on cores extracted initially and after 12 months (Nicholls et al 2014), 23 months (Nicholls et al 2015) and 40 months (Nicholls et al 2017). The MIST procedure includes both long-term moisture conditioning in the water bath and short-term cyclic pore pressure application using MIST.…”