Aggregate Packing Characteristics using various aggregate gradations of Asphalt mixture in Pakistan (Research Proposa)l

7/29/2019 Aggregate Packing Characteristics using various aggregate gradations of Asphalt mixture in Pakistan (Research Proposa)l

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M.sc Research proposal

Principal Investigator : Prof.Dr.M.A M.A Kamal

Researcher: M AAKIF ISHAQ

(2k12-Ft-Msc-Tr-07)University of Engineering and Technology Pakistan


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Contents Introduction

Literature review

Problem StatetementAims and Objectives

Methodology

Utilization

Refrences


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IntroductionAggregates constitute approx. 95% of asphalt mix by

weight. The durable asphalt mix is attributed to thefollowing:

Properties of aggregates. (Physical and chemical)

Properties of binder.

Percentage of binder used.

Arrangement of aggregate particles (gradation).Among all most important is last one


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Literature Review The particle size distribution or gradation of an aggregate

is one of the most important characteristics in determining

how an aggregate will perform as a pavement material. InHMA, gradation helps to determine almost everyimportant property including stiffness, stability,permeability, workability, fatigue resistance, frictionalresistance and resistance to moisture damage. (Roberts etal 1996).

The structure of the aggregate skeleton is closely related tothe rutting and fatigue characteristics, as well as thepermeability, durability and compact ability of HMA(Roque et al, 2006).


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Literature Review The Bailey method was originally developed to

improve the rut resistance of HMA mixes. Baileysmethod is not meant to be a complete design methodfor HMA mixes. Rather it allows the engineer to assesswhether coarse aggregate interlock will exist in themix (Vavrik et al, 2002).


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Why Aggregate Gradations is

Important?After selection of aggregates and binder of appropriate

quality the most important thing is the arrangementof aggregate particles.

Most of the compressive strength and resistance tomovement under truck loads comes from theaggregate Structure. Without Controlling this it is not

possible to obtain the desired results. Stronger thepacking Stronger will be the load bearing capacity.


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Problem Statement Road failures in the form cracking and rutting are a

common phenomenon faced throughout the world.Pakistan is also a victim of such failures. It is believedthat fatigue cracking is the result of pavementstructure and load of the traffic and permanentdeformation/ rutting is directly related to shearstrength of the mix, which is controlled by aggregateproperties.


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Problem statementAggregate Gradations and aggregate packing are most

governing parameters in asphaltic mixture properties.Without controlling this pavement will not serveeffectively .In Pakistan we are continually usingconventional gradations for asphalt mixtures.Conventional gradations is based on experience and itis also depends upon the designer experience. So itvary from designer to designer and as a resultsometime poor packing Results.


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Problems relevant to Packing

characteristicsPoor packing characteristics leads to

Rutting Fatigue cracking

Moisture Damage

Bleeding

Segregation of Mix


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Aims and Objectives

The purpose of my research is to study:

Packing characteristics of asphalt mixtures of Pakistanusing Conventional gradations on UBBAN SHAH Quarry.

Study of effect of packing characteristics under differentenvironmental and traffic loadings in laboratory.

Comparison of the packing characteristics usingconventional gradations with performance basedexperience gradation (Bailey Method)

If Bailey Method gives good performance characteristicsthen implementation Of Bailey Method in Field


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MethodologyAggregate packing characteristics will b studied in

laboratory by preparing

Marshall Mold at optimum bitumen content usingvarious Conventional gradations.

Marshall Mold at optimum bitumen content usingvarious Bailey method of gradations

Studying Aggregate packing characteristics usingBAILEY Method of gradation and conventional .


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Methodology Packing characteristics of Conventional and Bailey

Method of gradations will be compared at optimumbitumen content.

Performance testing using wheel tracker and UTM 5Pwill be topped up .

Results from this performance test will be analyzed for

each gradation, and results of conventional gradationswill be compared with Bailey.


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Experimental Equipment

Marshall compacter,

Marshall stability Machine, Theoretical Specific Gravity apparatus,

Wheel tracker,

Asphalt Pavement Analyzer,

UTM 5P.Marhall Mixer,

Roller Compactor.

Aggregate Impact


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Methodology

Literature Review

Material Collection

Laboratory Testing

AggregatePerformance Test

Aggregate Impactvalue

Los AngelesAbrasion

Specific Gravity

Fine AggregateAngularity

Bulk Density

Marshall MixDesign

Sieve Analysis

Mixing

Preparation ofMarshall Moulds

Bulk SpecificGravity

Theoretical Max.Specific Gravity

Marshall StabilityTest

Stability

Flowoptimum bitumen

calculation

Voids Calculation

Wheel TrackingTest Rut Depth

UTM 5P ITS, Mr, creep

Hamburg Rut Depth

Asphalt PavementAnalyzer Rut Depth


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Utilization Aggregate Packing characteristics of various

gradations will be analyzed and will be compared with

Bailey Method of gradations. As Bailey Method iscurrently being used in USA, Australia, and Canada aswell as in UAE and it is showing better results otherthan conventional gradations. If Bailey Method gives

better results then we will introduce it in Filed and itwill be great success and pavement distresses that aredue to poor packing characteristics will be reducedand maintenance cost will be reduced


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References 1] Christensen D et al. A mix design manual for hot-mix asphalt. NCHRP 9-33 report;

2009. [2] Button JW, Perdomo D, Lytton RL. Influence of aggregate on rutting of asphalt

concrete pavements. Transportation research record 1259. Transportation research board:Washington DC;1990. p. 14152.

[3] Anthony DS, Bahia HU. The effect of fine aggregate angularity, asphalt content andperformance graded asphalts on hot mix asphalt performance. WisDOT Highwayresearch study no. 0092-45-98; 2003.

[4] Gaudette BE, Welke RA. Investigation of crushed aggregates for bituminous mixtures.Michigan department of state and highway transportation. Report No. TB-58; 1977.

[5] Lottman RR, Goetz WH. Effect of crushed gravel fine aggregate on the strength ofasphaltic surfacing mixtures. National sand and gravel association circular no. 63; 1956.

[6] Dukatz EL. Aggregate properties related to pavement performance. In: Proceedings of

the association of asphalt paving technologists vol. 58; 1989. [7] Vallerga BA, Seed HB, Monismith CL, Cooper RS. Effect of shape, size, and roughness

of aggregate particles on the strength of granular materials. Special technical publication,No. 212, ASTM; 1957.

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Aggregate Packing Characteristics using various aggregate gradations of Asphalt mixture in Pakistan (Research Proposa)l