EVALUATION OF A BIOMASS DERIVED OIL FOR USE AS ADDITIVE IN PAVING ASPHALT

摘要

It has been demonstrated by extensive antistripping studies conducted on the different SDO samples supplied to ERL that the SDO antistripping properties are independent of the process used to produce the sludge derived oil (bench scale versus pilot scale), and relatively dependent on the sludge type (digested versus undigested). The digestion process removes some materials that would be converted to SDO in the oil from sludge process. The SDO from digested sludge also is less effective as an antistripping agent relative to the SDO from undigested sludge. A 3% SDO concentration was found to be as effective as 5% SDO concentration for stripping inhibition. Furthermore, when SDO was used at 3% concentration, the A/C's properties (penetration, viscosity and weight loss after TFOT) were not modified as much as when a 5% concentration was used. If one would like to use 5% SDO, the starting asphalt cement should be in the 60/70 penetration grade to produce a final A/C in the 85/100 penetration range. A comparison of the performance of the year old SDO sample with a fresh sample at the 5% additive level showed no major difference confirming that the SDO is very stable over time and does not lose its beneficial properties.