Utilization of Plastics in Roads
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UTILIZATION OF WASTE PLASTIC IN ROAD CONSTRUCTION
Creating Value - Challenges & NewOpportuniti
es with
Indigenous Technology
By :- PraSaNTa kUMar MahAtO
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HOW THIS IDEA EMERGED?
Threats of bans on POLYBAGS in south India –Dirty polybags
Waste eyesore-landfills full up.
Realistic Situation--Raw materials scarce in INDIA .-Economies of Asia-similar old disposal habits .-Cost and price driven responses can survive.-We firmly believe waste in only a resource in the wrong
places.
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OUTLINE
Introduction About the plastics Steps for using plastics On site execution Characteristic of waste plastic bitumen Characteristic of plastic coated
aggregate Advantages Disadvantages Conclusion
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INTRODUCTIONRecent studies in this direction have shown some hope in terms of using plastic-waste in road construction i.e., Plastic roads. 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 the aggregate and the mixture is laid on the road surface like a normal tar road.
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PLASTIC ROADS (BANGALORE)
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WHAT IS PLASTIC?
A plastic material is any of a wide range of synthetic or semi-synthetic organic amorphous solids used in the manufacturing of industrial products.Plastics are typically polymers of high molecular mass and may contain other substances to improve perfo--rmance and/or reduce costs. Monomers of plastic are either natural or synthetic organic compoundsDiscarded thin-plastic carry-bags are a menace. In town they clog drains, cause flooding, choke animals that eat them and are unsightly.
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PLASTIC WASTE, HARMFULL TO EARTH
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STEPS FOR USING PLASTICS IN ROADS:-
1. Segregation.
2. Cleaning process.
3. Shredding process.
4. Collection process.
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1) SEGREGATION-Plastic waste collected from various sources must be separated from other waste.Maximum thickness of 60 microns.
2) CLEANING PROCESS-Plastic waste get cleaned and dried.
SEGREGATION PROCESS CLEANING PROCESS
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3) SHREDDING PROCESS-
Different types of plastic wastes are mixed together and Plastics gets shredded or cut into small piece.
4) COLLECTION PROCESS -
Then plastic waste retaining in 2.36 mm is collected.
COLLECTED PLASTICSHREDDING PROCESS
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ON SITE EXECUTION
There are two type of execution
1. WET PROCESS
2. DRY PROCESS
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WET PROCESS
Blending of waste plastics by direct mixing
of shredded plastics with hot bitumen at 160°C
Mechanical stirrer is needed as the mixing is difficult because of difference in viscosities of molten polymer and bitumen.
Addition of stabilizers and proper cooling are required.
Since the wet process require a lot of investment and bigger plants
Not commonly used..
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DRY PROCESS
This process is developed by Dr. Vasudevan. The aggregate is heated to 170°C in the Mini hot Mix
Plant .
AGGREGATE TRANSFERRED TO PUDDLING CHAMBER
MINI HOT MIX PLANT
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The shredded plastic waste is added in equal proportion.
WASTE PLASTICS MIXED WITH THE HOT AGGREGATES
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COATED AGGREGATE PLAIN AGGREGATE
This plastics gets coated over the aggregate uniformly.
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BITUMEN IS ADDED WITHCOATED AGGREGATE
AGGREAGTE PALSTIC BITUMENMIX
• Immediately the hot Bitumen at 160°C is added with the mixture.
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The mixture is transferred to the road and the road is laid.
Road is being laid
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CHARACTERISTIC OF POLYMER MODIFIED
BITUMEN
% of Plastics
Ductility(cm) Penetration(mm)
Softening Point(oC)
1% 64 95 54
2% 55 90 50
3% 20 80 50
5% 11 55 72
10% 7 NIL 75
Use of higher percentage of plastics in polymer modified bitumen is not favorable.
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CHARACTERISTIC OF PLASTICS COATED
AGGREGATE Los Angel’s Abrasion Test –
Wear and tear values of plastic coated aggregate if found to be decreasing while using plastics.
Eg. 37% without plastic, 32% with 1% plastic, 29% with 2% plastic.
Soundness Test-The plastic coated aggregate, did not show
any weight loss, hence improve the quality of the aggregate.
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ADVANTAGES
Simple process, no new machinery is required
Use higher percentage of plastic waste. Reduce the need of bitumen by around 10%. Increase the strength and performance of
the road. Reduce the cost to around Rs. 5000/Km. of
single lane road. Generate jobs for rag pickers. Develop a technology, which is eco-friendly,
no toxic gas evaluation. Reduced penetration and ductility, a higher
softening point, resist the permeation of water and cold cracking.
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DISADVANTAGAES OF PLASTIC ROADS
1. Cleaning processToxics present in the co-mingled plastic waste would start leaching.
2. During the road laying processIn the presence of chlorine will definitely release noxious HCL gas.
3.After the road layingThe components of the road, once it has been laid, are not inert.
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Trisool Road (Tamil Nadu)Laid in April 2004Photo date Jan 2007
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Jubilee Park Road (Jamshedpur)Laid in Jan 2005Photo date Aug 2010
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CONCLUSION
Plastic will increase the melting point of the bitumen.
Use of the innovative technology not only strengthened the road construction but also increased the road life.
Help to improve the environment (eco- friendly).
Plastic road would be a boon for India’s hot and extremely humid climate where durable and eco-friendly roads which will relive the earth from all type of plastic waste.
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