The document summarizes a study that compared the rutting potential of unmodified and polymer modified asphalt binders. Samples were prepared with neat asphalt, polymer modified asphalt (PMB), and epoxy resin modified asphalt and tested using a wheel tracker at 60°C. The results showed that for 10,000 passes, the rut depth was 8.124 mm for neat asphalt, 2.615 mm for PMB, and 4.83 mm for epoxy resin modified asphalt. PMB also exhibited 50% less rutting compared to neat asphalt when the asphalt content was reduced from 4.39% to 4%. Therefore, using PMB can increase

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Study of Rutting Potential of Modified Binders and their comparison with Un-Modified Binder
Project Supervisor: Eng. Muhammad Salman (Assistant Professor)
Muhammad Abdullah Alvi (11-CE-157) Usman Afzal (11-CE-169)
University of Engineering and Technology Taxila, Pakistan
Introduction
Wheel Tracker Test
Rut Depth at 4% Asphalt Content
Results
Rut Depth at O.A.C
Optimum Asphalt Content Test Results
Conclusion
 For 10,000 passes of Cooper Wheel Track Machine, the
Final Rut Depth at Optimum Asphalt Content for the Neat
Asphalt, PMB and Epoxy Resin Modified Asphalt is 8.124
mm, 2.615 mm and 4.83 mm respectively.
 The Rut depth of PMB at 4% Asphalt Content increased
from 2.615 mm to 4.04 mm.
 At 4% Asphalt content, the final rut depth of Neat
Asphalt, PMB and Epoxy Resin Modified Bitumen is 8.2
mm, 4.04 mm and 13.0 mm respectively.
 The Rut depth of PMB at 4% Asphalt Content increased
to 4.04 mm. This depicts 50% lesser rutting as compared
to that of Neat Asphalt.
 The Rut depth of Epoxy Resin at 4% Asphalt Content
increased to 13 mm. This depicts 37% greater rutting as
compared to that of Neat Asphalt.
 The results revealed that for the same amount of Asphalt
Content i.e. for 4% Asphalt Content, the PMB would
resist 50% greater No. of Passes as compared to the
that of Neat Asphalt.
 The results also revealed that for the same amount of
Asphalt Content i.e. for 4% Asphalt Content, the Epoxy
Resin failed at 10,000 Passes.
Objective
 To study the rutting potential of modified and unmodified
binders at high temperature.
 To study the effect of modifiers on the life cycle of the
pavements using binder reduction technique.
 Effective Planning of the Project using Primavera P6.
Methodology
 Aggregate Selection
 Asphalt Binder Selection
 Sample Preparation (Including Compaction)
 Density and Voids Calculations
 Stability determination using the Marshall Stability and
Flow Test
 Optimum Asphalt Binder Selection
 A Laboratory Wheel-Tracking apparatus is used to
“simulate” channeled wheel traffic loading under
controlled conditions.
 Basic Purpose of this test is to study the rutting behavior
of pavements.
 Rutting is a common type of failure in pavements. It’s the
deformation in the pavement along the wheel path. There
are two types of rutting i.e. Mix Rutting and Subgrade
Rutting. In Pakistan due to good quality of aggregates
Subgrade Rutting seldom occurs. Mix rutting is prominent
in Pakistan.
 Over the few years the Road traffic has grown
significantly and the loads on the roads have also
increased due to introduction of more powerful and heavy
loaded rigid and articulated chassis trucks.
 The life cycle of the road, due to above mentioned factor,
has been decreased ominously.
 Due to global warming the temperature is increasing
considerably. Since temperature plays an important role
in road failures like Rutting, therefore, high temperature
evaluation of the rutting is done in our project. i.e. at 60o
Centigrade.
Fig#01: Mix Rutting Fig#02: Subgrade Rutting
Planning using Primavera P6
Description Details
Aggregate Source Margalla Hills
Asphalt 60/70 (Un-modified) Attock Oil Refineries
No. of Modifiers
02
Elvaloy Terpolymer and Epoxy Resin both with
1.5% by weight of Asphalt 60/70.
Gradation NHA-A Mid-point Gradation
Temperature for Testing 60o C
Fig#03: Weighing of Materials Fig#04: Sampling of Materials
Fig#05: Compacted Samples
Fig#06: Loose Mix Samples
Fig#07: Marshall Compactor
Fig#09: Compacted Samples under ConditioningFig#08: Temperature controlling in Water Bath
Mix Type A.C %
ARL 60/70 Neat 4
PMA 4.39
EPOXY RESIN 4.41
Fig#13: Wheel Tracking Machine
Passes 10,000
Frequency 26.5 rpm
Load 720 N
Test Temperature 60o C
Test Standard EN12697-22
Specimen Diameter 305x305x50 mm
Va 5.5±0.5
Fig#13: Computer Screen plotting Graph
Fig#14: Cooper Roller Compactor
 Compaction of Slab
specimens at roller
compactor was undertaken
in four phases. Pressure at
each phase and number of
passes corresponding to
each pressure have been
reported in Table.
Compaction Phases
1 2 3 4
Pressure
(bar)
3.5 4 4 4
No. of
Passes
10 10 5 5
Tests Results
Specific Gravity 2.63
Water Absorption 0.67%
Los Angles Abrasion Value 22.40%
Elongated 10.99%
Flaky 22.40%
Aggregate Properties
PMA Properties
Tests Results
PMB Asphalt 60/70
Mean Penetration Value (1/10mm) 33 62
Flash Point 234o C 260o C
Fire Point 242o C 264o C
Softening Point 67o C 52o C
 Rutting Potential of Asphalt 60/70 Un-modified, PMB and
Epoxy Resin was tested. After performing Wheel Track
Tests on specified conditions, it is, hence, concluded that
PMB is comparatively well resistant to the Rutting
Binder Reduction Technique
 On reducing the Binder content of PMB from 4.39% to 4%
the Rutting increased from 2.615 to 4.04 mm.
Nevertheless, this value was still 50% lesser as compared
to that of Rutting Potential of Un-Modified Binder i.e.
8.124 mm. This can, hence, be said that for the same
amount of Loading and No. of Passes the PMB would
offer double resistance to the Rutting as compared to that
of Neat Binder. This positive phenomenon will, hence,
increase the life cycle of the pavement and therefore will
prove to be a cost efficient technique.