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Study of Rutting Potential of Modified Binders and their comparison with Un-Modified BinderProject 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 thedeformation in the pavement along the wheel path. Thereare two types of rutting i.e. Mix Rutting and SubgradeRutting. In Pakistan due to good quality of aggregatesSubgrade Rutting seldom occurs. Mix rutting is prominentin Pakistan.

Over the few years the Road traffic has grownsignificantly and the loads on the roads have alsoincreased due to introduction of more powerful and heavyloaded 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 increasingconsiderably. Since temperature plays an important rolein road failures like Rutting, therefore, high temperatureevaluation 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 Modifiers02

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.