Presented By-:

Sulakshya Gaur

(121684)

Use Of “PLASTIC WASTE”

In Road Construction

CONTENT

INTRODUCTION

PLASTIC ROAD

MATERIAL USED

METHOD OF MIXING

ADVANTAGES

DISADVANTAGES

INTRODUCTION

Plastic use in road construction is not new. Recent 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 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.

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Materials Used

Aggregates

Bitumen

Waste plastic

Specifications for Waste Plastic

The following types of waste plastic can be used in the construction

of rural roads:

• Films (Carry bags, Cups) thickness up to 60micron (PE,PP and PS)

• Hard foams (PS) any thickness

• Soft foams (PE and PP) any thickness

• Laminated plastics thickness up to 60micron (Aluminum coated also)

packing materials used for biscuits, chocolates, etc.

BASIC PROCESSES

Segregation

Cleaning process

Shredding process

Collection process

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Segregation Plastic waste collected from various sources must be

separated from other waste. Maximum thickness of 60 microns.

SEGREGATION PROCESS

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Cleaning Process

Plastic waste get cleaned and dried.

Cleaning Process

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Shredding Process

Shredded or Cut into small piece.

Then different types of plastic wastes are mixed

together

Shredding process

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Collection process

The plastic waste retaining in 2.36 mm is collected.

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METHOD OF MIXING:

1. DRY PROCESS

2. WET PROCESS

DRY PROCESS

Plastics waste like bags, bottles etc are cut into a size between

2.36 mm and 4.75mm using shredding machine.

The aggregate mix is heated to 1700C. and then it is transferred

to mixing chamber.

Similarly the bitumen is to be heated up to a maximum of

1600C.

At the mixing chamber, the shredded plastics waste is added

over the hot aggregate.

The plastics waste coated aggregate is mixed with hot bitumen.

WET PROCESS

Waste plastics by direct mixing with hot bitumen at 160°C.

Mechanical stirrer is needed.

Since the wet process require a lot of investment and bigger

plants so not commonly used.

CHARACTERISTICS OF PLASTIC

COATED AGGREGATE

1 .Aggregate impact value

Plastics improves aggregate impact value.

Helps to improve the quality of flexible pavement

Aggregate impact value

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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.

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% of

Plastics

Moisture

absorption 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

Percentage of

plastics

coating over

aggregate

Compression

Strength

( Tonnes)

Bending

Strength

(Kg)

10 250 325

20 270 335

25 290 350

30 320 390

ADVANTAGES OF PLASTIC ROAD

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. Improvement in fatigue life of roads.

Better resistance towards rain water and cold weather Better resistance towards rain water and cold weather

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DISADVANTAGES OF PLASTIC

ROADS

1. Cleaning process

Toxics present in the co-mingled plastic waste would d start leaching.

2. During the road laying process

The presence of chlorine will definitely release noxious HCL gas.

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3. After the road laying

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.

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CONCLUSION

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.

Roads laid with plastic waste mix are found to be better

than the conventional ones.

Plastic will increase the melting point of the bitumen.

Rainwater will not seep through because of the plastic in

the tar. So, this technology will result in lesser road repairs.

Use of the innovative technology not only strengthened the

road construction but also increased the road life.2

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REFERENCE

Vasudevan .R, utilization of waste plastics for flexiblepavement, Indian High Ways (Indian Road Congress), Vol.34,No.7. (July 2006).

S.S.Verma,(2008),Roads from plastic waste, The IndianConcrete 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.