Use of Plastic Waste in Bituminous Pavement
R.Manju*; Sathya S; Sheema K
Department of Civil Engineering, Kumaraguru College of Technology,
Coimbatore- 641006, India
Abstract : The waste plastic and its disposal is a major threat to the environment, which results
in pollution and global warming. The utilization of plastic waste in bituminous mixes
enhances its properties and also its strength1. In addition it will also be a solution to plastic
disposal & various defects in pavement viz., pot holes, corrugation, ruts, etc. the waste plastic
used are poly-ethylene, poly-styrene, poly-propylene. The waste plastic is shredded & coated
over aggregate & mixed with hot bitumen and resulted mix is used for pavement construction.
This will not only strengthen the pavement and also increases its durability. The titanium-di-
oxide is used as a smoke absorbent material, which will absorb the smoke from the vehicles.
This innovative technology will be boon for Indian hot-
eco-friendly. In this paper, we have discussed about the soil properties to be considered in
design of pavement, pavement design, process of construction flexible and plastic-smoke
Keywords : plastic waste, flexible pavement, strength, eradication of pot holes.
The major threat to the environment is the disposal of waste plastic. In a highway, the potholes and
corrugation is the major problem9. Plastic pavement will be a better solution to the above stated problems. A
material that contain one or more organic polymer of large molecular weight, solid in its finished state, can be
plastic has high resistant to degradation. Plastic can be divided into two major categories- thermoses &
thermoplastics2,3. Thermosets have high durability and strength because it solidifies irreversibly when heated,
henceforth can be used primarily in construction application. Plastic is a non-degradable waste, causes green-
house effect and global warming. The various experiments have been carried out whether the waste plastic can
be reused productively. The various literature indicated that the waste plastic when added to hot aggregates will
form a fine coat of plastic over the aggregate and such aggregates when mixed with binder is found to have
higher strength, higher resistance and better performance over a period of time. Along with bitumen, use waste
plastic increases its life and smoothness. It is economical and eco-friendly. Addition of plastic waste in
construction of pavements reduces the plastic shrinkage and drying shrinkage. The use of waste plastic
improves the abrasion & slip resistance of asphalt pavement4. In India, because of hot and extremely humid
climate, plastic pavements of greatest advantage.
In order absorb the smoke from the vehicles; titanium di-oxide can be used. It also enhances the
mechanical properties of the plastic, resulting in higher strength and high resistance.
International Journal of ChemTech Research
CODEN (USA): IJCRGG, ISSN: 0974-4290, ISSN(Online):2455-9555
Vol.10 No.8, pp 804-811, 2017
/International Journal of ChemTech Research, 2017,10(8): 804-811. 805
The objectives of this project are:
To carry out the soil test.
To design the flexible pavement
To design the asphalt pavement with aggregate- plastic- bitumen mix.
To coat the aggregate with plastic and incorporate titanium di-oxide.
To test the bitumen and the modified bitumen.
3.0 Scope of The Project
To eradicate potholes
To minimize the global warming , greenhouse gases and pollution.
The lifespan of the roads can be increased.
Eco-friendly in nature.
3.1 Plastics Roads - General Introduction
Plastic use in road construction is not new. It is already in use as PVC or HDPE pipe mat crossings built
by cabling together PVC (polyvinyl chloride) or HDPE (high-density poly-ethylene) pipes to form plastic mats.
The plastic roads include transition mats to ease the passage of tyres up to and down from the crossing. Both
options help protect wetland haul roads from rutting by distributing the load across the surface. But the use of
plastic-waste has been a concern for scientists and engineers for a quite long time6. Recent studies in this
direction have shown some hope in terms of using plastic-waste in road construction i.e., Plastic roads. A
Bangalore-based firm and a team of engineers from R. V. College of Engineering, Bangalore, have developed a
way of using plastic waste for road construction. An initial study was conducted in 1997 by the team to test for
strength and durability. 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.
Reduce the need of bitumen by around 10%.
Develop a technology which is eco-friendly.
Improvements in fatigue life of roads.
Increase the strength and better performance of the road.
Use higher percentage of plastic waste.
The gases released during traffic conditions are absorbed by smoke absorbent.
Toxic present in the co-mingled plastic wastes would start leaching.
But the presence of chlorine will definitely release HCL gas.
4.0 Literature Review
Dr.R.Vasudevan,(2007) - stated that the polymer bitumen blend is a better binder compared to plain
bitumen. Blend has increased softening point and decreased Penetration value with a suitable ductility7.
Zahra Niloofar Kalantar(2012) - Many researches on PMA mixture have been conducted for the past
two decades. Although addition of virgin polymers to asphalt for the purpose of enhancing the properties of
asphalt over a wide temperature range in paving applications was contemplated quite some time ago, recycled
polymer added to asphalt have also shown almost the same result in improving the road pavement performance
as compared to virgin polymers. This paper is a review of the use of polymers in asphalt pavement. In this
study, a critical review on the history and benefits of using waste and virgin polymer in asphalt is presented
/International Journal of ChemTech Research, 2017,10(8): 804-811. 806
followed by a review of general studies on using polymers in asphalt in order to improve the properties of
Amit Gawande (2012) - The quantum of plastic waste in municipal solid waste (MSW) is increasing
due to increase in population, urbanization, development activities and changes in life style which leading
widespread littering on the landscape. Thus disposal of waste plastic is a menace and become a serious problem
globally due to their non-biodegradability and un aesthetic view. Since these are not disposed scientifically &
possibility to create ground and water pollution. This waste plastic partially replaced the conventional material
to improve desired mechanical characteristics for particular road mix. In conventional road making process
bitumen is used as binder. Such bitumen can be modified with waste plastic pieces and bitumen mix is made
which can be used as a top layer coat of flexible pavement11. This waste plastic modified bitumen mix show
better binding property, stability, density and more resistant to water.
Sunil J. Kulkarni (2015) - Minimization of waste material is important aspect of the modern growth
and development initiatives4. Plastic is used in various domestic and industrial applications. Use of plastic bags
and bottles is very common. The disposal of plastic waste is major problem due to non-biodegradable nature of
plastic. The plastic can be used as feedstock for ethanol like products. It can be used for road construction and
other construction related activities. The current review summarizes the research on use of waste plastic
Rishi Singh Chhabra (2014) - In the highway infrastructure, a large number of originates materials
and technologies have been invented to determine their suitability for the design, construction and maintenance
of these pavements. Plastics and rubbers are one of them. Also considering the environmental approach, due to
excessive use of polythene in day to day business, the pollution to the environment is enormous. The use of
plastic materials such as carry bags, cups, etc. is constantly increasing day by day10. Since the polythene are not
biodegradable, the need of the current hour is to use the waste polythene in some beneficial purposes. The use
of these materials as a road construction proves eco-friendly, economical and use of plastic gives strength in the
sub-base course of the pavement.
5.0 Comparative Study
5.1 Central Mixing Plant (CMP)
The dry process can also be carried out using central mixing plant. The shredded plastic is added along
with the aggregate in the conveyor belt. This is transferred into the hot cylinder. There aggregate is coated with
plastic first andthen with the bitumen. The mixer so prepared is then loaded in the dipper lorry and transported
for road laying. CMP helps to have better control of temperature and better mixing of this material thus helping
to have a uniform coating. This is adopted in our project.
The comparative study is done by testing the normal aggregates & plastic coated aggregates, and the
bitumen and modified bitumen (10% of bitumen replaced by plastic). The various tests that are carried out for
the comparative study are
Test on aggregates
i. Aggregate crushing test
ii. Los Angeles abrasion test
iii. Impact test
Test on bitumen
i. Penetration test
ii. Softening point test
iii. Viscosity test
iv. Marshall Stability test.
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6.0 Tests on Aggregates
6.1 Aggregate Crushing Test
The strength of the coarse aggregate may be assessed by aggregate crushing test. The aggregate
crushing value provides a relative measure of resistance to crushing under gradually applied compressive load.
To achieve a high quality of pavement, aggregates possessing high resistance to crushing or low aggregate
crushing value re preferred.
Figure 1 – Aggregate crushing value
6.2 Abrasion Tests
Due to the movements of traffic, the road stones used in the surface course are subjected to wearing
action at the top. Hence road stones should be hard enough to resist the abrasion due to traffic. Abrasion tests
are carried out to test the hardness property of stones and to decide whether they are suitable for the different
road construction works. The abrasion test on aggregate may be carried out using any one of the following three
Los Angeles abrasion test
Deval abrasion test
Dory abrasion test
However Los Angeles abrasion test is preferred as the test results have been correlated with pavement
6.3 Los Angeles Abrasion Test
The principle of Los Angeles abrasion test is to find the percentage wear due to the relative rubbing
action between the aggregate and steel balls used as abrasive charge. Pounding action of these balls also exists
during the test and hence the resistance to wear and impact is evaluated by this test.
Figure 2 – Aggregate Los Angeles Abrasion value
aggregates plastic coated
L.A. Abrasion value (%)
Aggregate crushing value (%)
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6.4 Impact Test
The test is designed to evaluate the toughness of stone or the resistance of the aggregates to fracture
under repeated impacts is called impact test. The aggregate impact test is commonly carried out to evaluate the
resistance to impact of aggregates and has been standardised by ISI.
The aggregate impact value indicates a relative measure of aggregate to impact, which has a different
effect than the resistance to gradually increasing compressive stress.
The aggregate impact value should not normally exceed 30% for aggregate to be used n wearing course
of the pavements. The maximum permissible value is 35% for bituminous macadam and 40% for water bound
macadam base course.
Figure 3 – Aggregate impact value
6.5 Tests on Bitumenpenetration Test
Penetration test is to determine the hardness of the bitumen. The penetration of a bitumen is the
is the bitumen).
Table 1 – test result of penetration value of bitumen vs Penetration Value (mm) modified Bitumen
Penetration Value (mm)
Penetration Value (mm)
Modified Bitumen (10% Plastic
6.6 Softening Point Test
The principle behind this test is that softening point is the temperature at which the substance attains a
particular degree of softening under specified condition of the test.Softening point denotes the temperature at
which the bitumen attains a particular degree of softening under the specifications of this test.
The test is conducted by ring and ball apparatus. A brass ring containing test sample of bitumen is
suspended in liquid like water or glycerine at a given temperature. A steel ball is placed upo
bitumen touches the metal plate which is at a specified distance below. Generally, higher softening point
indicates lower temperature susceptibility and is preferred in hot climates.
aggregates plastic coated
Aggregate impact value (%)
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Table2– test result of softening point of bitumen and modified bitumen (bitumen replaced by plastic)
6.7 Viscosity Test
Viscosity isdefined as the inverse of fluidity. Viscosity thus defines the fluid property of bituminous
material. Viscosity is the general term for consistency and is the measure of resistance to flow. Many
researchers believe that grading of bitumen should be by absolute viscosity units instead of the conventional
The degree of fluidity of the binder at the application temperature greatly influences the strength
Figure 4 – Digital test result representation of viscosity.
6.8 Marshall Stability Test
Table 3 – Percentage of bitumen content
10% bitumen replaced by
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Table 4 – Test results of Marshall Stability test
Stability of modified
7.1 Result and Disussion
The crushing value reduces from 23.32 to 14.22 for normal and plastic coated aggregate. The value was
reduced by 40%. Lower the aggregate crushing value higher is the strength.
the higher toughness of plastic coated aggregates.
Los Angeles abrasion value indicates the hardness of the aggregates. The abrasion value plastic coated
aggregates were 21% less than the normal aggregates.
The penetration value of bitumen is higher than the bitumen mixed with the plastic.
The bitumen softens 10oC less than the bitumen replaced with plastic.
The stability of modified bitumen (10% bitumen replaced by plastic) is higher than the normal bitumen.
The plastic mixed with bitumen and aggregates is used for the better performance of the roads. The
polymer coated on aggregates reduces the voids and moisture absorption. This results in the reduction of ruts
and there is no pothole formation. The plastic pavement can withstand heavy traffic and are durable than
flexible pavement. The use of plastic mix will reduce the bitumen content by 10% and increases the strength
and performance of the road. This new technology is eco-friendly.
The use of smoke absorbent material (titanium di-oxide) by 10% of polymer content can reduce the
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