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Use of Plastic Waste in Road Construction

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Roads from plastic waste

S.S. Verma

The debate on the use and abuse of plastics vis-a-vis environmental protection can go on, without yielding results until practical steps are initiated at the grassroots level by everyone who is in a position to do something about it. The plastic wastes could be used in road construction and the field tests withstood the stress and proved that plastic wastes used after proper processing as an additive would enhance the life of the roads and also solve environmental problems. The present write-up highlights the developments in using plastics waste to make plastic roads. Plastic is everywhere in today’?s lifestyle. It is used for packaging, protecting, serving, and even disposing of all kinds of consumer goods. With the industrial revolution, mass production of goods started and plastic seemed to be a cheaper and effective raw material. Today, every vital sector of the economy starting from agriculture to packaging, automobile, building construction, communication or infotech has been virtually revolutionised by the applications of plastics. Use of this non-biodegradable (according to recent studies, plastics can stay unchanged for as long as 4500 years on earth) product is growing rapidly and the problem is what to do with plastic-waste. Studies have linked the improper disposal of plastic to problems as distant as breast cancer, reproductive problems in humans and animals, genital abnormalities and even a decline in human sperm count and quality. If a ban is put on the use of plastics on emotional grounds, the real

cost would be much higher, the inconvenience much more, the chances of damage or contamination much greater. The risks to the family health and safety would increase and, above all the environmental burden would be manifold. Hence the question is not ‘?plastics vs no plastics’? but it is more concerned with the judicious use and re-use of plastic-waste.
Plastics roads
Plastic use in road construction is not new. It is already in use as PVC or HDPE pipe mat crossings built by cabling together PVC (polyvinyl chloride) or HDPE
(high-density poly-ethylene) pipes to form plastic mats. The plastic roads include transition mats to ease the passage of tyres up to and down from the crossing.
Both options help protect wetland haul roads from rutting by distributing the load across the surface. But the use of plastic-waste has been a concern for scientists and engineers for a quite long time. Recent studies in this direction have shown some hope in terms of using plastic-waste in road construction i.e., Plastic roads.
A Bangalore-based firm and a team of engineers from
R. V. College of Engineering, Bangalore, have developed a way of using plastic waste for road construction. An initial study was conducted in 1997 by the team to test for strength and durability. Plastic roads mainly use plastic carry-bags, disposable cups and PET bottles that are collected from garbage dumps as an important ingredient of the construction material. When mixed with hot bitumen, plastics melt to form an oily coat over

NOVEMBER 2008 The IndIan ConCreTe Journal 43

Pg2Pg2 Point of View

the aggregate and the mixture is laid on the road surface like a normal tar road. Basic process Waste plastic is ground and made into powder; 3 to 4 % plastic is mixed with the bitumen. Plastic increases the melting point of the bitumen and makes the road retain its flexibility during winters resulting in its long life. Use of shredded plastic waste acts as a strong “?binding agent”? for tar making the asphalt last long. By mixing plastic with bitumen the ability of the bitumen to withstand high temperature increases. The plastic waste is melted and mixed with bitumen in a particular ratio. Normally, blending takes place when temperature reaches
45.5C but when plastic is mixed, it remains stable even at 55C. The vigorous tests at the laboratory level proved that the bituminous concrete mixes prepared using the treated bitumen binder fulfilled all the specified
Marshall mix design criteria for surface course of road pavement. There was a substantial increase in Marshall
Stability value of the BC mix, of the order of two to three times higher value in comparison with the untreated or ordinary bitumen. Another important observation was that the bituminous mixes prepared using the treated binder could withstand adverse soaking conditions under water for longer duration. Comparison The durability of the roads laid out with shredded plastic waste is much more compared with roads with asphalt with the ordinary mix. Roads laid with plastic waste mix are found to be better than the conventional ones. The binding property of plastic makes the road last longer besides giving added strength to withstand more loads.
While a normal 'highway quality' road lasts four to five years it is claimed that plastic-bitumen roads can last up to 10 years. Rainwater will not seep through because of the plastic in the tar. So, this technology will result in lesser road repairs. And as each km of road with an average width requires over two tonnes of polyblend, using plastic will help reduce non-biodegradable waste.
The cost of plastic road construction may be slightly higher compared to the conventional method. However, this should not deter the adoption of the technology as the benefits are much higher than the cost. Plastic roads would be a boon for India’?s hot and extremely humid climate, where temperatures frequently cross
50C and torrential rains create havoc, leaving most of the roads with big potholes. Already, a kilometre- long test-track has been tested in Karnataka using this technology. The government is keen on encouraging the

setting up of small plants for mixing waste plastic and bitumen for road construction. It is hoped that in near future we will have strong, durable and eco-friendly roads which will relieve the earth from all type of plastic-waste. developments •? The office of the chief minister, New Delhi has a given a green signal to a private company for supply of bitumen mixed with plastic which is used for construction of roads.
•? The company has already constructed a two-km road in Bangalore with bitumen mixed with plastic. •? The government of Karnataka was pleased by the success of the experiment and the state chief minister himself inaugurated the field test of construction 500 m of road in three places in and around Bangalore with the help of PWD using the innovative technology.
Views
•? The director of the Central Road Research Institute
(CRRI) said that bitumen mixed with plastic or rubber improves the quality and life of roads.
•? The deputy director of the CRRI said that polymers mixed with bitumen increased the construction cost up to six per cent, but increased the longevity of roads manifold.
Conclusion
Plastics will increase the melting point of the bitumen. The use of the innovative technology not only strengthened the road construction but also increased the road life as well as will help to improve the environment and also creating a source of income. Plastic roads would be a boon for India’?s hot and extremely humid climate, where temperatures frequently cross 50C and torrential rains create havoc, leaving most of the roads with big potholes. It is hoped that in near future we will have strong, durable and eco-friendly roads which will relieve the earth from all type of plastic-waste.

Dr. S. S. Verma received his M.Sc. (physics) from H.P. University, Shimla and PhD (in magneto hydro dynamic power generation) from I.I.T. Delhi. Presently, he is an assistant professor in the department of physics at Sant Longowal Institute of Engineering and Technology, Punjab.

44 The IndIan ConCreTe Journal NOVEMBER 2008

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