Post on 15-Jul-2015
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.