Noise reduction in pavement made of rubberized bituminious top layer ppt

Internal Guidance Submitted By:
K. VENKAT ABDULAZIZ
(13QH1A0101)
HOLY MARY INSTITUTE OF TECHNOLOGY & SCIENCE
DEPARTMENT OF CIVIL ENGINEERING
A
Technical Seminar
Report
On
NOISE REDUCTION IN PAVEMENT MADE
OF RUBBERIZED BITUMINOUS TOP LAYER

Content
• Introduction
• History of rubberized bituminous top layer
• Classification of bituminous rubber in top layer
• Preliminary mix design of rubberized binders
• Advantages
• Disadvantages
• Stabilization and aggregates
• Conclusion
• References

INTRODUCTION
 Noise reduction in pavement made of
rubberized bituminous top layer also known as
asphalt rubber or just rubberized asphalt, is
pavement material that consists of regular
asphalt concrete mixed with crumb rubber
made from recycled tires.
 Asphalt rubber is the largest single market for
ground rubber in the United States, consuming
an estimated 220,000,000 pounds
(100,000,000 kg), or approximately 12 million
tires annually.

History of rubberized bituminous top layer
 Pavement material was pioneered by the city of
Phoenix, Arizona in the 1960s because of its high
durability.
 After that- California, Florida,Texas, and South
Carolina are also started asphalt rubber.
 In 2012, the State of Georgia issued a specification
for the use of rubber-modified asphalt for
bituminous top layer to control the noise.
 This tests are currently underway in other parts of
the United States to determine the durability of
rubberized bituminous top layer asphalt.

Classification of bituminous rubber
mixing in top layer
 Hot-mix asphalt (HMA),
 Cold-laid plant mix (CLPM),
 Stone Matrix-in-place or road mix
asphalt (SMA),
 Penetration macadam (PM).

Fig.3- Cold-laid plant mix
(CLPM)
Fig.4- Penetration macadam (PM)
Fig.1- Fig.2-

Preliminary mix design of the
rubberized binders are-
 Relatively low viscosity, so as to
compact easily.
 Elasticity as common elastromer binder.
 Penetration and R&B (Ring & Ball) test
similar to the common elastomeric
binder.
To be as homogeneous as possible
(which means very fine rubber particles
included).

Advantages
 Resistance to permanent deformation.
 Good durability due to high binder content.
 Good flexibility and resistance.
 Good low temperature performance.
 More economical in the long term.
 Provide friendly and safety features including
improved skid resistance on wet pavement of
top layers.
 Reduced noise and control traffic.
 Reduced reflection cracking.

Disadvantages
 Increased cost associated with higher binder
and filler contents, and additive.
 Possible delays in opening to traffic.
 Initial skid resistance may be low.
 High filler content may result in reduced
productivity.
The initial costs of 20-40% higher than
conventional dense graded mixtures.
 Give less rut depths in comparison to that
occurring in a dense friction.

Stabilization
 This can happen while the mix is in the HMA
storage silos, trucks for transporting and during
placement.
 Mix drain down is usually combated by adding
stabilizing additives. It can be organic or mineral
fibers or polymers.
 Stabilize the mixture and tend to thicken or bulk
the bitumen to prevent binder run-off from the
aggregate.
 They ensure the homogeneity of the mixture.
Aggregate interlock and particle friction are
maximized and gives the structure its stability and
strength.

Fig. 5- Major components of SMA mixture
Stone Matrix Asphalt Composition
 SMA is a blend of crushed coarse aggregate, crushed fine
aggregate (or sand), mineral filler, bitumen binder and stabilizing
agent. These major components
Of SMA mixtures are shown in
Fig.5.
 Stone skeleton mixture that,
when compacted, provides the
gap-graded stone-on-stone
structure to carry heavy traffic
loads, prevent rutting, and
provides long term durability.

SMA Aggregate
 Selection of materials is important in SMA design.The
coarse aggregate should be a durable, fully crushed rock
with a cubicle shape .
 Fine aggregate should be
at least 50% crushed. Filler
Can be ground limestone
rock, hydrated lime or
flyash.
Fig.6- SMA aggregate skeleton

Binder
 In rubberized bituminous top layer,
bituminous asphalt contains more binder than
conventional dense graded mixes, with
percentages ranging from about 6.0% to
7.5%.
 The performance of the mix is usually
enhanced with polymers and fibers.
 Polymer modified binders can be used to
give even greater deformation resistance.

Additives
• There are many additives in the market
including cellulose, mineral rock, wool
fibres, glass fibres, siliceous acid (artificial
silica), rubber powder and rubber granules
and polymers.
• Additives have been introduced into SMA
mixes to alleviate the drain down and
bleeding problems.

Bituminous Asphalt Properties
•It is a hot mixture with a relatively large
proportion of stones and a substantial
quantity of bitumen and filler.
•The main concept of having a gap
gradation of 100% crushed aggregates is
to increase the pavement’s stability
through interlock and stone-to-stone
contact.

• This mixture is designed to have 3–4% air voids
and relatively high bitumen content due to the high
amount of voids in the mineral aggregate.
• The mixture contains high filler content (10%
passing the 0.075-mm sieve), and a polymer in the
bitumen, or fibre (cellulose or mineral) in the mixture
to prevent the drainage of bitumen.
• This mixture has a surface appearance similar to
that of an open graded friction course; however it
has low in-place air voids similar to that of a dense
graded HMA

Designed and constructed SMA can
be enumerated as:
 The stone skeleton, with its high internal
friction, will give excellent shear resistance.
 The binder rich, void less mastic will provide
good durability and good resistance to cracking.
 The very high concentration of large stones,
three to four times higher than in a conventional
dense graded mixture will give superior
resistance to wear.

 The rough surface texture than that of dense
graded mixture will assure good skid resistance
and proper light reflection.
 The surface texture also provide anti-splash
features during wet and rainy conditions.
 Reduce hydroplaning which results from water
draining through the voids in the matrix.
 The increased durability of the SMA mixtures
can be attributed to thick film thickness and the
high binder content .

CONCLUSION
 In recent years there has been a great and continuous
effort to utilize EOL tires that are being stockpiled world
wide.The main research query of bituminous layer made
of rubberized dense-graded bituminous mixture,
implemented for the first time in Greece, through a pilot
applications.
 In present research, unique for Greece is that rubberized
bituminous mixtures could be a good solution for the re-
surfacing of any street which is in poor condition, since not
only does it reduces noise generation, but it also provides
more durable pavements that are less susceptible to the
effects of temperature, while maintaining the noise
reduction even after 8 months of operation. Furthermore,
the inventory and mapping of road network.

References
 www.google.com
 www.wikipedia.com
 www.bitumin.techno.edu.in
 www.ibrp.usa.in
 www.rawnauae.com
 www.icess.uk.in

Noise reduction in pavement made of rubberized bituminious top layer ppt

More Related Content

What's hot

Viewers also liked

Similar to Noise reduction in pavement made of rubberized bituminious top layer ppt

Recently uploaded

Noise reduction in pavement made of rubberized bituminious top layer ppt

Editor's Notes