Published on January 12, 2014
UTILIZATION OF WASTE PLASTIC IN ROAD CONSTRUCTION Creating Value - Challenges & New Opportunities with Indigenous Technology By :- PraSaNTa kUMar MahAtO
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.
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
INTRODUCTION Recent studies in this direction have shown some hope in terms of using plasticwaste 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.
PLASTIC ROADS (BANGALORE)
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 compounds Discarded thin-plastic carry-bags are a menace. In town they clog drains, cause flooding, choke animals that eat them and are unsightly.
PLASTIC WASTE, HARMFULL TO EARTH
STEPS FOR USING PLASTICS IN ROADS:1. Segregation. 2. Cleaning process. 3. Shredding process. 4. Collection process.
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
3) SHREDDING PROCESSDifferent 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. SHREDDING PROCESS COLLECTED PLASTIC
ON SITE EXECUTION There are two type of execution 1. WET PROCESS 2. DRY PROCESS
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..
DRY PROCESS This process is developed by Dr. Vasudevan. The aggregate is heated to 170°C in the Mini hot Mix Plant . MINI HOT MIX PLANT AGGREGATE TRANSFERRED TO PUDDLING CHAMBER
The shredded plastic waste is added in equal proportion. WASTE PLASTICS MIXED WITH THE HOT AGGREGATES
This plastics gets coated over the aggregate uniformly. COATED AGGREGATE PLAIN AGGREGATE
• Immediately the hot Bitumen at 160°C is added with the mixture. AGGREAGTE PALSTIC BITUMEN MIX BITUMEN IS ADDED WITH COATED AGGREGATE
The mixture is transferred to the road and the road is laid. Road is being laid
CHARACTERISTIC OF POLYMER MODIFIED BITUMEN Use of higher percentage of plastics in polymer modified bitumen is not favorable. % 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
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.
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.
DISADVANTAGAES OF PLASTIC ROADS 1. Cleaning process Toxics present in the co-mingled plastic waste would start leaching. 2. During the road laying process In the presence of chlorine will definitely release noxious HCL gas. 3.After the road laying The components of the road, once it has been laid, are not inert.
Trisool Road (Tamil Nadu) Laid in April 2004 Photo date Jan 2007
Jubilee Park Road (Jamshedpur) Laid in Jan 2005 Photo date Aug 2010
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 (ecofriendly). 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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