Laboratory investigation of concrete pavements containing fine RAP aggregates

Abstract

Poor affinity of asphalt toward mortar paste has been testified as the primary reason for reducing the reclaimed asphalt pavement (RAP)-inclusive concrete properties, although the effect of dust present in RAP aggregates due to extraction of RAP using demolition techniques has not been investigated so far. The present paper discusses the effect of different extraction methods on the mechanical properties of fine RAP aggregates. Also, the effect of incorporation of fine RAP aggregates on fresh, mechanical, and durability properties of concrete has been investigated. It was found that as the substitution level of fine natural aggregates (NA) by fine RAP (0, 25, 50, 75, and 100%) increases, the properties of concrete tend to decrease gradually. From the present laboratory investigation, it is learnt that 50% fine RAP (extraction made using demolition technique) can be used for construction of major highways, whereas 100% fine RAP may be suggested for less important roads and in lower layers of pavement. © 2017 American Society of Civil Engineers.