EFFCT OF REPEATED RECYCLING USING SUBSTANDARD RECLAIMED ASPHALT PAVEMENT ON PROPERTIES OF RECYCLED ASPHALT MIXTURE

Abstract

 The present study investigated effects of multiple cycles of aging and regeneration on physical properties of recycled asphalt mixtures containing four types of reclaimed asphalt pavements (RAP) with different degrees of aging. The recycled asphalt mixtures after repeated aged and regenerated had different physical properties depending on the aging degree of the RAP. More the deterioration of RAP progresses, the greater the proportion of aged asphalt that does not function effectively as a binder, and the crack resistance, water resistance, and workability decreased. Furthermore, a comparison of substandard RAP with different degrees of aged showed that the mixture properties decreased from the first regeneration on the recycled mixture using RAP with considerably advanced degradation. On the other hand, the recycled mixture using RAP with relatively less advanced degradation showed a slower decline in mixture properties, and had the same performance as the recycled mixture using RAP that satisfied the quality criteria.