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l. INTRODUCTION
Flexible pavements with asphaltic concrete are widely used all over the world.
Asphalt acting as a binder for aggregates is a very important ingredient affecting the
life cycle and travel comfort on roads. It has been an established fact that normal
bituminous course can not cope up with the following problems:
i. Increasing traffic on road / endemic overloading of vehicles leading to
undulations, rutting, cracking, deformations, potholing and shortening of life of
asphaltic pavements.
ii. High range of temperatures causing pavements to become softer in summer and
brittle in winter.
iii. Rains / water causing extensive stripping problems in asphaltic pavements.
To overcome the above problems in the entire world it has become a regular
practice to use modifier as additives to strengthen the asphalt for making longer
lasting asphalt mixes. This has been a very important development in the last 3
decades and has lead not only to huge saving by delaying the maintenance cycles
of the road but also its importance has been felt in countries where aggregates and
asphalt are in short supply .
NBP super is a crumb rubber based asphalt modifier. It is manufactured by blending
chemically treated crumb rubber, natural asphalt and Bismides chemicals. Natural
asphalt is a naturally occurring hydrocarbon mineral that is high in asphaltense and
high in the Nitrogen. When added to asphalt it dramatically increases the asphalt's
viscosity, lowering penetration while increasing the softening point.
The chemically treated crumb rubber and Bismides have been designed to rapidly
blend in to asphait. The addition of rubber gives the additional binding strength,
increasing elasticity and softening point of the asphalt. Carbon present in rubber
acts as an anti-oxidant and prevents asphalt from ageing and oxidization with sun.
The blend of these two i.e. NBP-Super is a complete modifier which gives over all
improvement when mixed with Asphalt by way of better resistance against hot , cold
and wet weather conditions. It also gives increased binding strength.
ll. PHYSICAL PROPERTIES
Physical properties of the Modifier are as follows:
Particle Size ( 2.35 mm sieve ) 100% passing ASTM : D-5644
Water content %wt.
0.75 max
ASTM : D-1864
Solubility in toluene%wt.
35 min
ISO : 4650
Ash content %wt.
7.0 max
ASTM : D-482
lll. ADVANTAGES
NBP-Super modifier substantially improves the vital properties of asphalt. NBP-
Super can eaily be blended with conventional grades of asphalt giving following
benefits to the base asphalt.
i. Increase of Softening point by at least 25%-thereby giving it protection against
hot climatic conditions.
ii. Increase in Elastic Recovery by at least 400% - thereby improving resistance to
cold climatic conditions and resistance to cracking under stress.
iii. Lower penetration thereby making harder grade of asphalt, giving additional
strength to the road and reduces water damage.
iv. Improvement in Ageing Characteristics thereby giving longer life to the roads.
v. Improved Adhesion thereby giving better strength, stability and longer life.
vi. Reduce noise pollution.
vii. Saves energy and natural resources.
Further more, NBP-Super has unique characteristics against other polymers thet it
does not require specialized equipment for mixing it with asphalt and also heating
and reheating of asphalt has minimal effect on the properties of the modifier.
lV. CONCLUSION
The NBP-Super product has been designed to incorporate the proven benefits of
natural asphalt and visco-elastic properties of rubber. The mixture is intended to be
cost effective and easy to use. The most critical elements is even dispersion of
modifier through out asphalt matrix.
i. Cost increase in modified asphalt is around 25-30% in comparison to the plain
asphalt.
ii. Cost increase in hot mix is around 10-12%.
iii. The life of pavement goes up by 2-2.5 times.
iv. Binder content in hot mix designs reduces by 8-10% depending upon the
aggregates and asphaltic mix design.
GRADE 60/70
SPECIFICATIONS
60/70
60/70 + 12% NBP-SUPER TEST METHOD
Penetration(25 °C)(0.1 mm)( °C)
65
40
ASTM D-5
Softening Point ( ring & ball) (°C)
49.5
64
ASTM D-36
Elastic Recovery of Half.
Thread in Ductilometer at
15 C% min
10
60
IRC:SP:53:02
Specific Gravity (25 °C)
1.015
1.04
ASTM D-70
Elastic Recovery after TFOT @ 25 °C, cm
6
45
IRC:SP:53:02
Retained Penetration after
TFOT @ 25 °C, % OF
66
72
ASTM D-5
Viscosity @ 135°C, cst
310
1540
ASTM D-2170
Flash point
327
365
ASTM D-92
GRADE 80/100
SPECIFICATIONS
80/100
85/100 + 12% NBP-SUPER
TEST METHOD
Penetration(25 °C)(0.1 mm)( °C)
89
50
ASTM D-5
Softening Point ( ring & ball) (°C)
47
57
ASTM D-36
Elastic Recovery of Half.
Thread in Ductilometer at 15 °C% min
10
50
IRC:SP:53:02
Specific Gravity (25 °C)
1.02
1.012
ASTM D-70
Elastic Recovery after
TFOT @ 25 °C, cm
6
40
IRC:SP:53:02
Retained Penetration after
TFOT @ 25 °C, % OF Original
63
70
ASTM D-5
Viscosity @ 135°C, cst
228
1235
ASTM D-2170
Flash point
321
365
ASTM D-92
Asphalt Grade
Binder Air Void Marshall Stability Predicted Cycles
Content
Content (75 blow) To Km. Rut
At 60 °C Minimum
Depth (ESALs)
60/70
4.9 %
3-4 %
1200
12.1 Million
60/70 + NBP Super
4.4 %
3-4 %
1800
30.4 Million
Bituminous mixes made with NBP-Super show the following improvement in the
properties in comparison to the bituminous mixes made with ordinary bitumen:
1. Increase in Marshall Stability
2. Increase in Fatigue life
3. Elastic Modulus gets enhanced
4. Improves Water Repellent Properties
4. Improves Skid Resistance during hot and wet conditions
5. Improves Ageing Resistance
Sure about the 100% pure quality if you buy
from us.
© NBPco.net 2010
Made with GCT Co.
