Utilization of waste plastic in road construction

PRESENTED BYDESAI PRITHVIRAJ NARAYAN

T.E.-C (CIVIL)ROLL NO.-45

UNDER THE GUIDANCE OF

Prof. A. S. KULKARNI Prof S. V. PATASKAR

(SEMINAR GUIDE) (HOD)

D.Y.PATIL COLLEGE OF ENGG. AKURDI,PUNE-44

How this idea emerged?

Threats of bans on POLYBAGS in India –Dirty polybagsWaste 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

IntroductionAbout the plasticsSteps for using plasticsOn site executionCharacteristic of waste plastic bitumenCharacteristic of plastic coated

aggregateAdvantages DisadvantagesConclusion

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.

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.

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 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

On site execution

There are two type of execution

1. WET PROCESS

2. DRY PROCESS

Wet ProcessBlending of waste plastics by direct mixing of shredded plastics with hot bitumen at

160°CMechanical 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 .

AGGREGATE TRANSFERRED TO PUDDLING CHAMBER

MINI HOT MIX PLANT

The shredded plastic waste is added in equal proportion.

WASTE PLASTICS MIXED WITH THE HOT AGGREGATES

COATED AGGREGATE PLAIN AGGREGATE

This plastics gets coated over the aggregate uniformly.

BITUMEN IS ADDED WITHCOATED AGGREGATE

AGGREAGTE PALSTIC BITUMENMIX

• Immediately the hot Bitumen at 160°C is added with the mixture.

The mixture is transferred to the road and the road is laid.

Road is being laid

CHARACTERIZATION OF WASTE PLASTICS

17

Percentage of plastics coating overaggregate

Compression Strength( Tonnes)

Bending Strength(Kg)

10 250 325

20 270 335

25 290 350

30 320 390

% of Plastics

Moistureabsorption Soundness Voids

Aggregate crushing test

Los angeles abrasion

Nil 4% 5% 4% 26% 37%

1% 1% NIL 2.2% 21% 32%

2% 1% NIL 1% 20% 29%

3% 0.5% NIL NIL NA NA

5% 0.35% NIL NIL NA NA

10% 0.12 NIL NIL NA NA

SR.NO.

PROPERTIES PLASTIC ROAD ORDINARY ROAD

1. Marshal Stability Value More (200-300 %)

× Less (25 %)

2. Binding Property Better × Good3. Softening Point Less × More4. Penetration Value More × Less5. Tensile Strength High × Less6. Rutting Less × More7. Stripping (Pot Holes) No × More8. Seepage of water No × Yes9. Durability of roads Better × Good10. Cost of Pavement Less × Normal11. Maintenance Cost Almost Nil × More12. Environment Friendly Yes × No

Waste Plastic Bituminous Road V/s Ordinary Bituminous Road

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 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.

Trisool Road (Tamil Nadu)Laid in April 2010Photo date Jan 2013

Jubilee Park Road (Jamshedpur)Laid in Jan 2012Photo date Aug 2016

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.

New Thinking & New Possibilities

We can’t imagine the world without plastic…

And from now we should have to start looking at plastic as sustainable resource rather than a waste.

The Govt. has to take initiative & make the use of waste plastic mandatory…

REFERENCE

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

IRC, “Tentative Specifications for Bituminous Surface dressing Using Pre-coated Aggregates,” IRC: 48-1.972, Indian Roads Congress.

National Rural Roads Development Agency Ministry of Rural Development, Gol.Guidelines for the use

of Plastic Waste in Rural Roads Construction.