Selection of asphalt recycling methods and recycled asphalt mixture properties

The socioeconomic growth of a country depends on the health of its transportation network. To maintain the highway portion of the network, the needs for fixing pavements has to compete with other demands on the limited public funds. Asphalt pavement recycling is one way to stretch existing resources and if adopted properly, it can precipitate in substantial savings in cost, energy and natural resources.;In this study, methodologies and procedures for the adoption of asphalt pavement recycling in Pakistan were developed based on field and laboratory investigations. Twelve asphalt concrete (AC) pavement test sites were selected and each test site was subjected to the detailed field investigation stated below. In addition, one source of virgin binder, two sources of recovered material, and two sources of virgin aggregates were identified and sampled. The samples were subjected to the lab investigation stated below.;The field investigation consisted of: distress surveys, material sampling, longitudinal and transverse profiles, and nondestructive deflection testing (NDT). The laboratory investigation consisted of characterizing the properties of virgin, blended and recovered materials. Based on the field and laboratory investigations, guidelines for hot in-place (HIR), cold in-place (CIR) and in-plant (IPR) recycling were developed. The guidelines were implemented to determine the recommended recycling methods for each of the twelve test sites.