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seminar report on utilisation of waste plastic in bituminous mixes for road construction

ABSTRACT
Solid waste management is the thrust area. Of this various waste materials, plastic waste and municipal solid waste are of great concern. On the other side, the road traffic is increasing. The traffic intensity is increasing. The load bearing capacities of the road are to be increased. Our present work is helping to take care of both these aspects. Plastic waste, consisting of carry bags, cups and Thermocoles can be used as a coating over
aggregate and this coated stone can be used for road construction. By this process a road of 1 Km length and 3.375M width of single lane can consumes 10, 00000 carry bags and the road strength is increased by 100% and there found no any pot hole. The mix polymer coated aggregate have shown higher strength. Use of this mix for road construction helps to use plastics waste. Once the plastic waste is separated from municipal solid waste, the organic matter can be converted into manure and used. The main object of paper is to analyze & study how the waste plastic will be effectively utilized in construction of flexible pavement as a binder material for replacing the content of bitumen and in detail process & its successful application.

INTRODUCTION
The growth in various types of industries together with population growth has resulted in enormous increase in production of various types of waste materials, world over. The creation and disposal of non-decaying waste materials such as Blast Furnace Slag, Fly-ash, Steel Slag, Scrap Tyres, Plastics, etc. have been posing difficult problems in developed as well as in developing countries. Considerable work has been done in various countries for the disposal of some of these waste products and utilisation of some other products and there is a long list of published literature dealing with different aspects of these challenging problems(1). Attempts are still being made by various organisations and researchers to find methods for effective utilisation of some of these waste materials. Of these, the efforts to find useful applications of some of the waste products in highway construction have given encouraging results (1). The work done in India, particularly at the Central Road Research Institute (CRRI), New Delhi on the use of waste materials like Fly-ash and Slag in road construction is note worthy.

The use of thin plastic bags to pack and to carry various materials including house hold articles has become a common practice all over the country. However the disposal of the waste plastic bags in large quantities has been a problem and is of great concern, particularly in big cities. The mixing up of these waste plastic bags with other bio-degradable organic waste materials in the garbage of the urban areas has been the main cause of the problem. Therefore attempts are being made in some cities to limit or even to prohibit the use of the thin plastic bags for packing and other common use, so as to control this "undesirable waste material" from getting mixed up with the other organic garbage.

In case it is possible to find useful application for the waste plastic bags, there will be substantial scrap value for this waste product and therefore they will be collected and sold by interested persons, instead of being littered or thrown out in the dust bins or into the road side drains.

At the initiative of M/s K.K. Poly Flex Pvt. Ltd., a study on the possible use of the processed plastic waste bags with the bituminous mixes was carried out at the R.V. College of Engineering Bangalore. A group of students of B.E. degree course in Chemical Engineering of this college under the guidance of the concerned teaching staff carried out their final year project work for studying the possibility of using of the processed plastic bags with bitumen and bituminous mixes(2). As some encouraging results were reported in this study, M/s K.K. Poly Flex Pvt. Ltd. later approached the Centre for Transportation Engineering of Bangalore University with the request to carry out further research studies on the effects of using the processed plastic bags with bituminous mixes for road construction works. This company supplied the processed plastic material and they also helped the Centre for developing some additional facility to test the bituminous mix specimens under controlled temperature.

CONCLUSION
The generation of waste plastics is increasing day by day. The major polymers namely polyethylene, polypropylene, polystyrene show adhesion property in their molten state. Plastics will increase the melting point of the bitumen. The waste plastic bitumen mix forms better material for pavement construction as the mix shows higher Marshall Stability value and suitable Marshall Coefficient. Hence the use of waste plastics for pavement is one of the best method for easy disposal of waste plastics.