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

B. PAVEMENT ENGINEERING AND PAVING MATERIALS
4. Utilization of Polymer Waste in Construction Industries (Road Construction)
Date of Start

April 2005
Central Road Research Institute, New Delhi (R)

 

Scope and Objectives

The objective was to improve the quality of bitumen binder using polymer wastes, to optimize the composition of plastic waste used in blend to meet the required specification and to develop a technology for utilization of waste samples in road construction,

 
Methodology
Appropriate quantity of non- biodegradable plastic wastes of Polyolefin group were added to hot melt bitumen to get the plastic- bitumen blends. These blends were characterised as per the BIS – 15462 to assess the grade of waste thermoplastic modified binders as well as their compliance with the specifications. Fourier Transform Infra Red Spectroscopy (FTIR) was obtained of polymer used, cross linking agent used, polymer modified bitumen and plain bitumen samples, so as to get some idea of reaction mechanism. Scanning Electron Microscopy (SEM) was also done of these samples to find out the morphological structure of polymer modified bitumen. This helps us to know the dispersion of polymer phase in bitumen. Delhi Marshall Samples were prepared with varying composition of bitumen. Properties of these samples were determined to find out optimum binder content for this proportion of aggregate. Properties like, Marshall Stability, flow, indirect tensile strength, retained stability and creep behaviour were tested and results obtained were compared with the samples prepared with plain bitumen. Test results indicated improved tensile strength and stability of BC mixes
 
Findings and Conclusions
The exhaustive laboratory investigation on neat and modified Bitumen indicated significantly improved softening point and penetration value. This clearly indicates better performance of polymer modified bitumen at varying temperature conditions. Improvement in Marshall Stability and indirect tensile strength of modified mixes indicates good performance of polymer modified bitumen after laying on roads. Higher resistance to permanent deformation in terms of lower accumulated strain and higher creep modulus of modified mixes than conventional mixes was observed by creep test.