II. PAVEMENT ENGINEERING AND PAVING MATERIALS

2. FLEXIBLE PAVEMENT

B. NEW PROJECTS
3. Evaluation of Bituminous Products using SHRP Equipments
Date of Start:

April 2005
Indian Oil Corporation Ltd., R&D Centre, Faridabad (R)

 
Scope and Objectives
To evaluate the performance of bituminous products namely conventional bitumen, crumb rubber modified bitumen, polymer modified bitumen & multigrade bitumen using Dynamic Shear Rheometer (DSR) Bending Beam Rheometer (BBR), Direct Tension Tester (DTT) Rotational Viscometer (RV) etc. as per performance grade (Super pave) binder specification to see the performance grading & compare with conventional bitumens.
 
Methodology
Bituminous products have been evaluated for G*/Sin (rutting resistance) using DSR & viscosity using RV on the original binder. Bituminous products have been aged in the rolling thin film over (RTFO) and evaluated for G*/Sin using DSR. The RTFO aged bituminous products have been further aged in pressure ageing vessel (PAV) and evaluated for G* X Sin  (Fatigue resistance) using DSR, Creep stiffness (S) & m-value using BBR, failure strain using DTT.
 
Interim conclusions
Crumb rubber modified bitumens have highest rutting resistance compared with conventional bitumens & Multigrade bitumen. Multigrade bitumens have showed better fatigue resistance & low temperature cracking resistance compared with conventional bitumens & crumb rubber modified bitumens and also showed better rutting resistance than conventional bitumens.

 

Limitations
Evaluation of polymer modified bitumens using above equipments is under progress