PERFORMANCE EVALUATION OF COLD RECYCLING EXPERIMENTAL STRETCH CONSTRUCTED WITH RBI-GRADE-81 AT BANGALORE UNIVERSITY

Abstract

The bituminous pavement rehabilitation alternatives are mainly overlaying, recycling and reconstruction. In the recycling process the material from deteriorated pavement, known as reclaimed asphalt pavement (RAP), is partially or fully reused and it is a valuable approach for technical, economical, and environmental reasons. Full Depth Reclamation (FDR) is one of the cold methods of recycling the bituminous pavements. In this study an experimental stretch is selected for FDR in which the full flexible pavement section and a predetermined portion of the underlying materials are milled and remixed with about 10 % of 10 mm down size aggregate and 30 % stone dust to match the Bituminous Concrete (BC) Grade-I mix limits and known quantity of RBI 81 stabilizer. Stabilization of RAP material with RBI grade 81 reduces the requirement of new materials, time of construction and increases the strength of the road. This report consist of a case study of road constructed at Jnanabharathi campus, Banglore University, which include assessment of existing pavement condition and the preparation of pavement surface for the construction of stabilized layer and construction aspects of pavement using RAP material stabilized with RBI grade 81. The report also presents results of some short term functional and structural condition studies on the study stretch. From the limited studies carried out it is concluded the RAP material can be used effectively by the stabilization with RBI grade 81. From the field studies it is concluded that the strength of the pavement increases with increase in RBI grade 81 dosages.