VI. RESEARCH WORK DONE IN ACADEMIC INSTITUTIONS RELATED TO THESIS WORK

B. PAVEMENT ENGINEERING AND PAVING MATERIALS
9. Evaluation of Rutting Characteristics of Bituminous Mixes using C -Ф Concept
Date of Start

May 2005
Indian Institute of Technology, Kharagpur (S,I)

 

Scope and Objectives

The main objective was to examine the feasibility of using C-Ф concept of mix design. Considering permanent deformation in bituminous mixes as major mode of failure in hot climatic conditions of India, it was examined as the main performance parameter in the present work. The scope of the work was to develop a co-relation between fundamental properties of bituminous mixes with C- Ф and permanent deformation.

 
Methodology
Experimental investigation was done by selecting different aggregate gradation and binders and subsequent evaluation of their properties. C-Ф values of bituminous mixes prepared from different combinations of binders, gradation and binder content were determined. Permanent deformation characteristics of bituminous mixes as well as resilient modulus were then evaluated at different temperatures.
 
Findings and Conclusions
It was identified that as the percentage of coarse aggregate increases, C-Ф of the mix increases and also as the viscosity of binder increases, C of the mix increases. Also C-Ф, binder content and viscosity of the binder had been identified as the independent parameters influencing the permanent deformation. It was found out that C-Ф and viscosity of the binder are inversely related and also an attempt was made to correlate MR with C-Ф and air voids.