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Use of plastic waste in road construction

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plastic waste in road construction

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Use of plastic waste in road construction

  1. 1. 1
  2. 2.  plastic waste - hazard to the environment.  plastics waste - construction of flexible pavement. Plastic Road At Thambaram (2007) 2
  3. 3. What is plastic?? A material that contains one or more organic polymers of large molecular weight, solid in its finished state and at some state while manufacturing or processing into finished articles, can be shaped by its flow.  Types of plastics 1.Thermosets. 2.Elastomers. 3.Thermoplastics. 3
  4. 4. 1. solids or semi solid materials 2. light yellow to darkbrown in colour 3. carbon, hydrogen and oxygen. 4. globules on the bark . 4
  5. 5. 1. derived primarily from petroleum. 2. polystyrene, polyesters and acrylics 3. used in the manufacture of varnishes, plastics, adhesives and rubber. 5
  6. 6. 1. Polyethylene terephthalate (PET,PETE) 2. Density polyethylene(HDPE) 3. Vinyl(Poly vinyl chloride or PVC) 4. Low Density Polyethylene(LDPE) 5. Polypropylene(PP) 6
  7. 7. 1. Segregation . 2. Cleaning process . 3. Shredding process . 4. Collection process . 7
  8. 8. › plastic waste collected from various sources must be separated from other waste. › Maximum thickness of 60 microns. SEGREGATION PROCESS 8
  9. 9.  Plastic waste get cleaned and dried. cleaning process 9
  10. 10.  will be shredded or cut into small piece.  the different types of plastic wastes are mixed together shredding process 10
  11. 11.  the plastic waste retaining in 2.36 mm is collected. collected plastic 11
  12. 12.  There are two type of field trials 1.Dry process 2.Wet process 12
  13. 13.  The aggregate is heated to 170°C in the Mini hot Mix Plant . Heated aggregates 13
  14. 14.  the shredded plastic waste is added in equal proportion. Adding shredded plastic 14
  15. 15. 15 Aggregate-plastic- Bitumen Mix •The mixture is transferred to the road and the road is laid. • Immediately the hot Bitumen 60/70 or 80/100 grade (160°C) is added .
  16. 16.  Waste plastics by direct mixing with hot bitumen at 160°C  Mechanical stirrer is needed  Addition of stabilizers and proper cooling.  Since the wet process require a lot of investment and bigger plants  Not commonly used.. 16
  17. 17. 1 Binding property  Plastic is a good binder. BINDING PROPERTY % of plastic coating over aggregate Compressive strength (MPa) Bending strength (MPa) 10% 250 325 20% 270 335 30% 290 350 40% 320 390 17
  18. 18.  2 Thermal study Thermal study 18
  19. 19.  that the use of higher percentage of plastics in polymer modified bitumen is not favorable. Polymer modified bitumen 19
  20. 20. 1 .Aggregate impact value  plastics improves aggregate impact value.  helps to improve the quality of flexible pavement Aggregate impact value 20
  21. 21. 2.Los Angel’s Abrasion Test  wear and tear values of plastic coated aggregate is found to be decreasing the percentage of plastics  (Eg.37% without plastic, 32% with 1% plastic and 29% with 2% plastic) 3.Soundness Test  The plastic coated aggregate, did not show any weight loss, improvement in the quality of the aggregate. 21
  22. 22.  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. 22
  23. 23. 1. Cleaning process  Toxics present in the co-mingled plastic waste would d start leaching. 2. During the road laying process  But the presence of chlorine will definitely release noxious HCL gas. 23
  24. 24.  The components of the road, once it has been laid, are not inert.  It is opined that the first rain will trigger leaching. As the plastics will merely form a sticky layer, (mechanical abrasion).  once the road is started to be used will cause the release of fine polymer particles.  When air-borne, these will cause a particulate problem. 24
  25. 25.  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 .  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 25
  26. 26.  Vasudevan .R, utilization of waste plastics for flexible pavement, Indian High Ways (Indian Road Congress), Vol.34, No.7. (July 2006).  S.S.Verma,(2008),Roads from plastic waste, The Indian Concrete Journal ,pp.43-47  Kajal , N K S Pundhir , Sangita and A Chandra(2007), Use of waste plastics and copper slag for low cost bituminous roads, Journal Of Scientific and Industrial Research,Vol.66.pp.938-994  IRC, “Tentative Specifications for Bituminous Surface dressing Using Pre-coated Aggregates,” IRC: 48-1972, Indian Roads Congress  ISI, “Indian Standards Specifications for Roads Tar”, IS: 215, Indian standard Institution 26
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