Abstract
Research was performed to investigate the changes in the quality of asphalt mixtures that were repeatedly recycled in a cold, snowy region. Asphalt binders with penetration values of 80 to 100 and aggregates recycled from asphalt were used in studying the properties of asphalt binders and repeatedly recycled asphalt mixtures. The focus was on their various properties in the low-temperature range. Test pieces made from asphalt that had been repeatedly recycled and degraded to a penetration value of approximately 20, showed wide variations in chemical and physical properties. The results demonstrate that bringing recycled aggregates to the same quality as new materials requires more than just adjusting the penetration value of the aggregates by adding recycled admixture.
