plastic in road construction methods of doing, advantages , method of mixing, collection process, required materials etc....

1. USE OF PLASTIC WASTE IN
ROAD CONSTRUCTIONS.

2. CONTENTS:
 INTRODUCTION
 PLASTIC ROAD
 MATERIAL USED
 METHOD OF MIXING
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION

3. INTRODUCTION:
 Plastics are the non-biodegradable materials and so a means to degrade our
environment. Plastic wastes have proved to be a source of health hazard as
it is toxic in nature. Plastic waste is a big nuisance in today’s world. So, this
plastic waste should be reused to eliminate the threat to the surroundings.
One such reuse can be in the construction of flexible pavements. Plastic
coated aggregates have proved to offer better resistance to abrasion and
wear and tear. Moreover the bond between these plastic coated aggregates
and the bitumen is also very strong due to increased contact area between
plastic (polymers) and bitumen. Such roads show better performance and
have increased life spans.

4. WASTE PLASTIC ROADS:
 Bitumen has been known to be used as a binder for road
construction. However, the performance of these
bituminous binders is questioned time and again, given
that they are brittle and hard in cold environments and
soft in hot environments.
 Use of waste plastic in bitumen has revealed improved
performance, stability, strength and fatigue life,
reduction in overall rutting. Apart from solving the
problem of waste disposal, addition of waste plastics in
bituminous mix results in reduction in consumption of
bitumen thereby resulting in overall cost reduction.

5.  The related experimentation has indicated that the waste plastic, when
added to hot aggregate will form a fine coat of plastic over the aggregate
and then when mix is produced with the binder, it is found to give higher
strength, higher resistance to water and better performance over a period
of time. Therefore, it is pertinent to use waste plastic in the construction
of roads

6. MATERIALS USED:
AGGREGATES
BITUMEN
WASTE PLASTIC

7. BASIC PROCESS:
 SEGREGATION PROCESS
 CLEANING PROCESS
 SHREDDING PROCESS
 COLLECTION PROCESS

8. SEGREGATION:
 Plastic waste collected from various sources must be separated from each
other.
 Maximum thickness of 60 micron.
CLEANING PROCESS:
The separated plastic waste gets cleaned and
dried.

9. SHREDDING PROCESS:
 Shredding or cut in to small pieces is done.
 Then different types of plastic wastes are mixed
together.
COLLECTING PROCESS:
 The plastic waste retaining in 2.36mm is
collected.

10. METHOD OF MIXING:
DRY PROCESS
WET PROCESS

11. DRY PROCESS:
 In Dry process waste plastics are used as
coating materials by softening the plastic and
not by burning. For a flexible pavement
heated stone aggregate (170oC) is mixed with
hot bitumen (160oC) and the mix is used for
road laying. The aggregate when coated with
plastics improved its quality with respect to
voids, soundness and moisture absorption and
decreases porosity and thus the performance
of the pavement is increased.

12. WET PROCESS:
 Plastic waste is ground and made into powder.
Powdered plastic waste is added to the bitumen at
160oC. High shear blender is required to prepare
plastic modified bitumen and specific chemical
treatment may be required to restrict the phase
separation. The process does not yield a
homogenous mix with prominent separated solid
deposits of mix therefore wet process was not
adopted.
Dry process is the most widely adopted method for
using waste plastic in road construction.

13. ADVANTAGES:
 Stronger road with increased Marshall Stability Value.
 Better resistance towards moisture susceptibility.
 Increased binding and better bonding of the mix.
 Reduction in pores in aggregate and hence less rutting and ravelling.
 Increase the strength and performance of the road.
 Reduce the need of bitumen by 10%.
 High resistance to temperature susceptibility.
 Value addition to the waste plastics.
 The cost of road construction is also decreased.
 The maintenance cost of the plastic roads is also less in comparison
to control roads.
 Disposal of waste plastic will no longer be a problem.

14. DISADVANTAGES:
 Cleaning process- Toxics present in the co-mingled plastic waste would
start leakage.
 During the road laying process- the presence of chlorine will release
noxious HCL gas.

16. 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 types of plastic wastes.
 Roads laid with plastic waste mix are found to be better
than the conventional mix.