Utilization of RAP for the construction of CTB containing thin bituminous pavement layer and chemical stabilizer

Abstract

In the new global economy, getting natural aggregates (NA) has become a central issue for constructing flexible pavements, due to scarcity of aggregates and the ban on mining in various states in India. To overcome the issue, and to achieve sustainability, utilization of existing reclaimed asphalt pavement (RAP) material by using chemical stabilizer (CS) for the construction of cement-treated base (CTB) was studied in the present study. Based on the mix design obtained from laboratory results, it was concluded that the mix prepared with 4.5% cement and 4% chemical stabilizer provides the best result in terms of strength parameter and mechanical properties of studied samples. Falling Weight Deflectometer (FWD) was used to confirm the Elastic Moduli adopted for the various pavement layers. The back-calculation was done using KGPBACK software. IITPAVE software was also used to further analyze the pavement. The laboratory and field findings of the elastic moduli and UCS values of the materials correlates with each other. Hence, it is worthy of designing a high-quality CTB using cement with CS using 100 % existing RAP material that meets desired performance criteria as per the standard specifications.