I. Highway Planning, Management, Performance Evaluation & Instrumentation

3. PAVEMENT PERFORMANCE

C. NEW PROJECTS
1. Investigations on Field Performance of Bituminous Mixes with Modified Binders
Date of Start:

March 2006
Indian Institute of Technology Madras, Chennai (R,C)

 

Scope and Objectives

The scope of project is limited to study the performance of bituminous mixes with crumb rubber, natural rubber and SBS, SBR polymer modified binders and waste plastics only. Even though there are several types of bituminous layers adopted in highway construction in the country, this study will be limited to the performance of modifiers on bituminous concrete layers alone. The performance of bituminous layers constructed using the modified binders will be evaluated in terms of deflection and riding quality measured in terms of unevenness index. The performance of various modifiers will be quantified in terms of pavement condition index and unevenness index. The life-cycle cost of various modified binders will be evaluated duly considering the traffic, climate and environmental factors.

  The major objectives of this project are
Laboratory evaluation of the properties of the various modified binders
To carry out laboratory tests on bituminous mixes using various modifiers and to study the properties of the mixes
To study the fatigue performance of bituminous mixes and develop performance prediction models
To study the field performance of overlays with various modified binders an to develop performance prediction models for use in pavement design
To carry out life cycle cost analysis and to bring out the design charts for overlay designs using various modified binders for application.
 
Methodology
The basic properties of these binders will be studied in the laboratory and variation on the performance of the various binders will be evaluated. Marshall Specimens will be prepared in the laboratory and the properties of bituminous concrete mixes will be studied. Core samples will be brought from test tracks constructed using modified binders and their properties will be evaluated in the laboratory.

The fatigue performance of bituminous concrete mixes using various modified binders will be studied over a period of three years. The fatigue performance will be evaluated in terms of cracks area and width of cracks. The rutting potential of various bituminous mixes will be evaluated in terms of rut depth measured under wheel path. The other performance indicators like raveling, pothole and riding quality of the various pavement sections overlaid using various modified binders will be monitored periodically. Models will be developed to predict the performance of the pavement overlaid with the modified binder mixes. The longevity of the bituminous concrete mixes overlaid with various modified binders will also be quantified.
 
Significant/Utilisation Potential
Comparative analysis of various properties of the modified binders.
Comparative evaluation of the properties of the bituminous concrete mixes using various modified binders.
Models for fatigue performance of bituminous concrete mixes using various modifiers during laboratory investigations.
Evaluation of the field performance of overlays with various modified binders.
Development of performance prediction models for use in pavement design.
Guidelines selection of appropriate modified binders under different climatic and traffic conditions.