II. PAVEMENT ENGINEERING AND PAVING MATERIALS

2. FLEXIBLE PAVEMENT

B. NEW PROJECTS
4. Investigation on Field Performance of Bituminous Mixes with Modified Binders, MOSRT&H Research Scheme (R-85)
Date of Start:

March 2006
(i) Indian Institute of Technology, Madras (R, I)
(ii) Ministry of Shipping, Road Transport & Highways (S)

 
Scope and Objectives
(i) To study the performance of bituminous mixes with crumb rubber, natural and SBS, SBR Polymer modified binders and waste plastics only.

(ii) The total length to be covered under the present study will be 20 km located in the State of Karnataka, which will be identified by the Regional Officer, MoSRT&H Bangalore.

(iii) The total length of 20 km on which performance evaluation is to be carried out will be divided into four parts and each part will be treated with different binders namely neat bitumen, PMB, CRMB and the bitumen mixed with waste plastic

(iv) Supervision on the plant site at the time of mixing of the plastic waste with the bitumen as well as during laying of the mixes in the field in the entire 20 km length to be done.

(v) The performance of the bituminous layers constructed using the modified binders will be evaluated for their performance in terms of rut depth, crack area, pot hole area, structural adequacy in terms of deflections and riding quality measurement in terms of unevenness index.

(vi) The performance of the various modifiers will be quantified in terms of pavement condition index and using the unevenness index, the life cycle cost of various modified binders will be evaluated duly considering the traffic, climate and environmental factors.
 
Methodology
(i) Marshall Specimens will be prepared in the laboratory and the properties of the bituminous concrete mixes will be studied.

(ii) The properties of various binders will be studied in the laboratory and their variation on the performance of the various binders will be evaluated.

(iii) Core samples will be taken from the test tracks constructed using modified binders and their properties will be evaluated.

(iv) The performance of bituminous mixes using various modified binders will be studied over a period of three years and will be evaluated in terms of rut depth, raveling, pot hole and riding quality.

(v) Models will be developed to predict the performance of the pavements overlaid with the modified binder mixes.

(vi) To ensure application of the findings, recommendations for specifications for various types of construction using PMB, CRMB and bitumen modified with plastic waste will be prepared.

(vii) The longevity of the bituminous concrete mixes overlaid with various modified binders will be quantified and presented.
 
Interim conclusions
This study will give comparative analysis of the various properties of the modified binders as well as comparative evaluation of the properties of the asphaltic concrete mixes using various modified binders. The study will help in development of performance prediction models for use in pavement design. The study will also evolve design matrix to help selection of appropriate modified binders under different climatic and traffic conditions.

 

Significance/Utilisation Potential
This study envisages study of performance of various modifiers on asphaltic concrete layers in terms of rut depth, crack area, pot hole area, structural adequacy in terms of deflections, riding quality measurement in terms of unevenness index. The performance of various modifiers will be quantified in terms of pavement condition index and using the unevenness index, the life cycle cost of various modified binders can be evaluated which will be of great help in selecting various kinds of modified binders duly considering the traffic, climate and environmental factors.