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EVALUATION OF STONE MASTIC ASPHALT USING PALM OIL FUEL ASH
AS FILLER MATERIAL
NOOR AZREENA BINTI KAMALUDDIN
A project report submitted in partial fulfillment of the
requirements for the award of the degree of
Master of Engineering (Civil - Transportation and Highway)
Faculty of Civil Engineering
Universiti Teknologi Malaysia
JUNE 2008
iii
“Dedicated to my beloved mother,
Napisah Jusoh and father, Kamaluddin Md. Noh
My sisters, Noor Aizam, Noor Adeeb, Intan Baiduri and Norlia
My brothers, Ahmad Azwan, Mohd. Kamarul Hafiz, Mohd Safari and Luqman
My nephew, Mohd Afiq Ruzaini
My sweeties nieces, Nur Fatin Nadia and Putri widat Khairina
and to very special person, Mohd Faizal Abd. Rahman
for their love, support and patience are awesome”
I Love u all very much......Thank you
iv
ACKNOWLEDGEMENT
In the name of Allah S.W.T, I would like to express my gratefulness to Him
for giving me strength to finish my master project. I also would like to express my
deep sense of gratitude to Assoc. Prof. Dr. Mohd Rosli Hainin, my project’s
supervisor, for his extraordinary help, guidance, encouragement and critics in making
and completing this project. I am very thankful to all my members of project
presentation consisted of Assoc. Prof Dr. Abdul Aziz bin Chik, Tn. Hj. Che Ros bin
Ismail and Miss Nor Hidayah Hassan for their critical judgments and advice during
the masters project presentation.
During the various phases of the laboratory research, I was fortunate and
happy to be associated with all technicians of Highway and Transportation
Laboratory UTM, Mr. Suhaimi, Mr. Ahmad Adin, Mr. Abdul Rahman, Mr. Azman
and Mr. Sahak. I thank to their contribution during the laboratory experimental
work. Special thanks also to all my fellow postgraduate friends, Wadat, Ros, Tiong,
Esarwi, Nhat and Ricky for their support, assistance and encouragements towards the
success of this study. Last but not least, thank you very much for those who involve
direct or indirectly in completing this project. I hope this project can give “new
energy” as a contribution for the research development.
v
ABSTRACT
This paper presents a study of laboratory evaluation on the performance of
Stone Mastic Asphalt (SMA) using Palm Oil Fuel Ash (POFA) as filler material.
POFA produced by burning palm fibre and shell which is generally used as boiler
fuel to produce steam for electricity generation in the mill. POFA is one of the
materials identified to have a potential of becoming an alternative filler material in
SMA mixes. In this project, a small portion of POFA (passing 75µm) was used to
modify asphalt mixtures. POFA was incorporated into asphalt mixes by using dry
process method which refers to technologies that mix POFA with the aggregate prior
to mixing it with asphalt binder. The aggregate gradations use in this study is gap
graded (stone mastic asphalt with 14mm nominal maximum aggregate size-SMA14).
The percentage of POFA added was varied from 0 to 7 % (2% hydrated lime) by
weight of the total aggregate which is 0 to 100% by weight of the filler content.
Samples was prepared and compacted using Marshall Method. Several performance
indicators of mixes was evaluated using laboratory work were moisture induced
damage/stripping resistant and Marshall volumetric properties. The performance
results of modified asphalt mixes were compared to conventional asphalt mixes
(unmodified samples). Based on the results, the performance of HMA mixes such as
stability, flow and stiffness was significantly affected with the addition of POFA.
The results suggest that 50% POFA by weight of filler content is the optimum value.
vi
ABSTRAK
Kajian ini dijalankan untuk menilai tahap prestasi ‘Stone Mastic Asphalt’
(SMA) yang ditambah abu kelapa sawit (POFA) sebagai bahan pengisi. POFA
terhasil dari proses pembakaran sabut dan tempurung kelapa sawit yang pada
kebiasaannya digunakan sebagai bahan bakar dandang untuk menghasilkan wap bagi
menjana sistem elektrik di dalam kilang memproses minyak kelapa sawit. POFA
adalah salah satu bahan yang dikenalpasti mempunyai potensi untuk dijadikan bahan
pengisi alternatif di dalam campuran SMA. Di dalam kajian ini, POFA (melepasi
saiz ayak 75μm) digunakan dalam kuantiti yang sedikit untuk mengubahsuai
campuran SMA. POFA akan dimasukkan ke dalam campuran asfalt dengan
menggunakan kaedah proses kering (dry process) di mana POFA dicampurkan ke
dalam aggreget sebelum diadun dengan bitumen. Campuran aggregate yang akan
digunakan di dalam kajian ini ialah ‘gap graded’ (Stone mastic asphalt dengan
14mm saiz nominal maksimum – SMA 14). Peratus POFA yang digunakan di dalam
kajian ini divariasikan dari 0 hingga 7% (2% hydrated lime) dari berat keseluruhan
aggreget di mana 0 hingga 100% dari berat keseluruhan bahan pengisi. Sampel
disediakan dan dipadatkan dengan menggunakan kaedah Marshall. Beberapa ujian
prestasi campuran yang dijalankan ialah ujian kerosakan akibat lembapan (moisture
induced damage) dan ciri-ciri isipadu Marshall. Keputusan prestasi campuran yang
telah diubahsuai dibandingkan dengan campuran yang tidak diubahsuai (tanpa
POFA). Berdasarkan dari keputusan yang diperolehi, dapat diperhatikan bahawa
POFA memberi kesan yang ketara terhadap prestasi campuran asfalt terutamanya
kestabilan, aliran dan kekukuhan. Keputusan menunjukkan 50% POFA dari
kandungan pengisi adalah nilai optimum yang boleh digunakan.
vii
TABLE OF CONTENTS
CHAPTER TITLE PAGE
DECLARATION OF THE STATUS OF THESIS
SUPERVISOR’S DECLARATION
TITLE PAGE
DECLARATION ii
DEDICATION iii
ACKNOWLEDGEMENT iv
ABSTRACT v
ABSTRAK vi
TABLE OF CONTENTS vii
LIST OF TABLES xi
LIST OF FIGURES xiii
LIST OF ABBREVIATIONS/SYMBOLS xvi
LIST OF APPENDICES xviii
1 INTRODUCTION 1
1.1 Background 1
1.2 Problem Statement 3
1.3 Objective of the Study 4
1.4 Scope of the Study 4
1.5 Significant of the Study 5
viii
2 LITERATURE REVIEW 6
2.1 Introduction 6
2.2 Hot Mix Asphalt 7
2.3 Stone Mastic Asphalt 7
2.3.1 Advantages of SMA 10
2.3.2 Disadvantages of SMA 11
2.3.3 Composition of SMA 11
2.4 Stone Mastic Asphalt Materials 13
2.4.1 Aggregate 13
2.4.2 Asphalt Binder 13
2.4.3 Mineral Filler 16
2.5 Palm Oil Fuel Ash (POFA) 16
2.5.1 Chemical Composition of POFA 18
2.6 Grading Types 18
2.6.1 Dense Graded 19
2.6.2 Gap Graded 20
2.6.3 Open Graded 21
2.6.4 Fine Gap Graded 22
2.7 Mix Design Method 22
2.7.1 Marshall Mix Design Method 24
2.8 Stripping 27
3 METHODOLOGY 28
3.1 Introduction 28
3.1.1 Aggregate 30
3.1.2 Palm Oil Fuel Ash (POFA) 30
3.1.3 Stabilising Agent 31
3.1.4 Stone Mastic Asphalt (SMA) Mixture 32
3.2 Operational Framework 34
3.3 Sieve Analysis of Fine and Coarse Aggregate 35
3.3.1 Apparatus 35
3.3.2 Procedures 36
3.4 Washed Sieve Analysis of Mineral Filler 36
ix
3.4.1 Apparatus 37
3.4.2 Procedures 38
3.5 Aggregate Gradation 38
3.6 Specific Gravity of Aggregates 39
3.6.1 Specific Gravity for Coarse Aggregate 40
3.6.1.1 Apparatus 40
3.6.1.2 Procedures 40
3.6.2 Specific Gravity for Fine Aggregate 41
3.6.2.1 Apparatus 42
3.6.2.2 Procedures 42
3.7 Bituminous Binder 43
3.8 Palm Oil Fuel Ash (POFA) 44
3.9 Marshall Mix Design 44
3.9.1 Marshall Sample Preparation (Compacted Sample) 45
3.9.1.1 Apparatus 45
3.9.1.2 Procedures 46
3.9.2 Theoretical Maximum Density (Loose Mix) 47
3.9.2.1 Apparatus 49
3.9.2.2 Procedures 49
3.9.3 Flow and Stability Test 50
3.9.3.1 Apparatus 50
3.9.3.2 Procedures 51
3.9.4 Data Analysis 53
3.9.4.1 Bulk Specific Gravity 53
3.9.4.2 Void Fill with Bitumen (VFB) 54
3.9.4.3 Void in Total Mix (VTM) 54
3.9.4.4 Void in Mineral Aggregate (VMA) 54
3.9.4.5 Determination of Optimum Bitumen
Content (OBC)
55
3.9.5 Binder Draindown Test 56
3.9.5.1 Apparatus 57
3.9.5.2 Procedures 58
3.9.5.3 Calculation 58
x
3.10 Moisture Induced Damage Test 59
3.10.1 Apparatus. 59
3.10.2 Procedures 60
3.10.2.1 Preparation of Laboratory Test Specimens 60
3.10.2.2 Evaluation of Test Specimens and Grouping 61
3.10.2.3 Preconditioning of Test Specimens 61
3.10.2.4 Testing 64
3.10.3 Calculations 66
4 RESULTS AND DISCUSSIONS 68
4.1 Introduction 68
4.2 Materials Preparation 68
4.2.1 Aggregate 69
4.2.1.1 Aggregate Gradation 69
4.2.1.2 Washed Sieve Analysis 71
4.2.1.3 Specific Gravity 71
4.2.2 Asphalt Cement 72
4.2.3 Palm Oil Fuel Ash (POFA) 72
4.3 Marshall Sample 73
4.3.1 Sample Preparation 74
4.3.2 Determination of Optimum Bitumen Content (OBC) 74
4.3.3 Theoretical Maximum Density (TMD) 75
4.3.4 Results of Volumetric Properties 75
4.3.5 Determination of Optimum POFA Content 79
4.4 Moisture Induced Test 80
5 CONCLUSIONS AND RECOMMENDATIONS 86
5.1 Conclusions 86
5.2 Recommendations 87
REFERENCES 88
APPENDICES A-G 91
xi
LIST OF TABLES
TABLE NO TITLE PAGE
2.1 Design criteria for the Marshall method 26
2.2 Minimum percent voids in mineral aggregate (VMA) for
the Marshall method26
3.1 SMA mix requirements 29
3.2 50 blows Marshall criteria for surface mixes 33
3.3 Gradation limit for SMA 14 39
3.4 Total number of samples 45
4.1 Gradation limit for SMA 14 70
4.2 Mass of dust in washed sieve analysis 71
4.3 Specific gravity of materials 71
4.4 Chemical composition and physical properties of POFA 73
4.5 Details of mixes produced 74
xii
4.6 Marshall mix design results of the SMA mixes 76
4.7 Moisture Induced Damage results 82
xiii
LIST OF FIGURES
FIGURE NO TITLE PAGE
2.1 Comparison between SMA and conventional HMA 8
2.2 SMA aggregate skeleton 9
2.3 Major components of SMA mixture 12
2.4 Palm oil shell 17
2.5 Palm Oil Fuel Ash (POFA) after grounded 17
2.6 Structure of dense graded mix 19
2.7 Structure of gap graded mix 20
2.8 Structure of open graded mix 21
3.1 Palm Oil Fuel Ash (POFA) after grounded 31
3.2 Flow chart for laboratory process and analysis 34
3.3 Mechanical sieve shaker 37
xiv
3.4 The aggregate was sieve in the mechanical sieve shaker 37
3.5 Automatic Marshall compactor 48
3.6 Apparatus for TMD test 48
3.7 Water bath for submerging sample 52
3.8 Machine for flow and stability test 52
3.9 Draindown test apparatus 56
3.10 Dimension of wire basket 57
3.11 Unconditioned samples wrapped with plastic 62
3.12 Conditioned samples in water bath for curing 63
3.13 Unconditioned and conditioned samples in the water bath
before test63
3.14 Indirect Tensile Strength (ITS) test 64
3.15 Unconditioned samples after tested 65
3.16 Conditioned samples after tested 65
4.1 Gradation limit for SMA 14 70
4.2 Stability vs Bitumen Content 77
4.3 Flow vs Bitumen Content 77
xv
4.4 Density vs Bitumen Content 77
4.5 VTM vs Bitumen Content 78
4.6 VFA vs Bitumen Content 78
4.7 VMA vs Bitumen Content 78
4.8 Tensile strength for unconditioned and conditioned
samples82
4.9 Samples without POFA 83
4.10 Samples with 25% POFA 83
4.11 Samples with 50% POFA 84
4.12 Samples with 75% POFA 84
4.13 Samples with 100% POFA 85
4.14 Unconditioned samples 85
4.15 Conditioned samples 85
xvi
LIST OF ABBREVIATIONS/SYMBOLS
POFA Palm Oil Fuel Ash
HMA Hot Mix Asphalt
SMA Stone Mastic Asphalt
NAPA National Asphalt Pavement Association
TSR Tensile Strength Ratio
SMA 14 Stone Mastic Asphalt with Nominal Maximum Aggregate Size
of 14mm
JKR Jabatan Kerja Raya
UTM Universiti Teknologi Malaysia
AAPA Australia Asphalt Pavement Association
DG Dense Graded
ASTM American Society for Testing and Materials
US United State
VMA Voids in Mineral Aggregate
VFA Voids Filled with Asphalt
VTM Voids in Total Mix
AASHTO American Association of State Highway and Transportation
Officials
PG Performance Grade
OBC Optimum Bitumen Content
MRP Malaysia Rock Product
TMD Theoretical Maximum Density
SSD Saturated-Surface-Dry
LAA Los Angeles Abrasion
xvii
ITS Indirect Tensile Strength
SiO2 Silicon Dioxide
AlO3 Aluminium Oxide
FeO3 Ferric Oxide
CaO Calcium Oxide
MgO Magnesium Oxide
SO3 Sulphur Trioxide
LOI Loss on Ignition
OPC Ordinary Portland Cement
HL Hydrated Lime
Gsb Combined bulk specific gravity of total aggregate
Gmb Bulk specific gravity of compacted mix
Gmm Theoretical maximum density
AC Asphalt Cement
xviii
LIST OF APPENDICES
APPENDIX TITLE PAGE
A Aggregate size distribution and determination of filler 91
B Wash sieve analysis (SMA 14) 92
C Specific gravity for coarse and fine aggregate (SMA 14) 93
D Marshall test results 96
E Determination of OBC at 4% air void (NAPA) for SMA 14 103
F Theoretical maximum density (TMD) for SMA 14 108
G Moisture induced damage results 113
CHAPTER I
INTRODUCTION
1.1 Background
Over the last few decades, the Malaysian palm oil industry has grown to
become a very important agriculture-based industry, where the country is today the
world’s leading producer and exporter of palm oil (Yusoff, 2004). At the same time,
there are lot of researches has been conducted in order to investigate other alternative
material as a filler/modifier in asphalt mixes. The concept of modifying asphalt
mixes is not new. In fact, since years ago there have been numerous efforts to
modify asphalt mixes in order to get a better performance and quality of hot asphalt
mixes.
However, in Malaysia, the application of ash as filler in hot mix asphalt is not
significant enough. This is due to the less number of researches being conducted in
evaluating the potential of ash as an alternative material to improve the performance
of asphalt mixes according to Malaysian condition. Hence, there is a need to conduct
a detailed study on the performance of Malaysian hot mix asphalt using Palm Oil
Fuel Ash (POFA) as a modifier/filler. Recycling of the waste product will not only
have environmental significance, but it also has potential to be cost effective and
improve performance of new flexible pavements as compared to conventional hot
2
mix asphalt. Besides, if the enhanced characteristics of asphalt pavement using
POFA as filler are significant, it could be a potential for POFA to be used as a
modifier in HMA mixes.
It is necessary to address the engineering properties, environmental and
economic concerns before using these materials in order to achieve sustainable
development. SMA containing a waste material should perform equal or better than
conventional SMA. In addition, it should be also noted in environmentally issues
both for the initial construction and future recyclability.
The type of aggregate gradation used in this study was gap graded gradation
which is stone mastic asphalt (SMA14). Stone mastic asphalt is a tough, stable, rut-
resistant mixture that relies on stone-to-stone contact to provide strength and a rich
mortar binder to provide durability. The estimated 20-25% increase in cost is more
than offset by the increase in life expectancy of the mix, primarily through the
decreased rutting and increased durability. SMA is considered to be a premium mix
by several state Departments of Transportation for use in areas where high-volume
traffic conditions exist and frequent maintenance is costly (NAPA, 2002).
In this study, the investigation was conducted by using binder PG 76 on a
range of gap graded (SMA 14) containing 0% (control), 25%, 50%, 75% and 100%
Palm Oil Fuel Ash (POFA) by the total weight of the filler content. The performance
of modified and conventional SMA were compared through laboratory tests on the
mechanical properties such as stability, flow, stiffness and resistance to moisture-
induced damage in order to investigate the influence of utilisation of Palm Oil Fuel
Ash (POFA) as filler material in hot mix asphalt mixtures.
3
1.2 Problem Statement
Within the last few years, environmental issues are increasingly becoming
more important in Malaysia and all over the world. The ash produced by burning
palm fibre and shell is considered to be a waste product and the disposal of which
poses enormous problems. In many develop countries, due to the increasing cost of
materials and the continuous reduction of natural resources, the use of waste material
is a potential alternative in the construction industry. Waste material likes Palm Oil
Fuel Ash (POFA), when properly processed, have shown to be effective as
construction materials and readily meet the design specifications (Mannan and
Ganapathy, 2002). This will have the double advantage of reduction in the cost of
construction material and also as a means of disposal of waste. In this study, the
feasibility of using POFA as filler material will be evaluated.
On the other hand, the increases of traffic loading and number of heavy
vehicles caused pavements tend to fail prematurely either structurally or functionally
even though they have been designed to last longer. Repeated application of traffic
loads can cause structural damage to asphalt pavements in the forms of fatigue
cracking of asphalt layer, rutting along the wheel tracks and loss of adherent between
aggregate and asphalt cement and cause stripping. These kinds of damages quite
worst especially in hot climatic conditions like Malaysia. Government has spent
millions of ringgit to repair and maintain roads in this country. Development of
modified asphalt mixes has been explored over the past few decades in order to
improve the performance of pavements mixes. Utilisations of POFA as modifier
material in asphalt mix have not been firmly established and explored. Thus, there is
a need to conduct a study to evaluate the performance of HMA after being modified
using Palm Oil Fuel Ash (POFA) according to Malaysian condition. In this study,
resistance of compacted bituminous mixture to moisture-induced damage using
POFA was investigated.
4
1.3 Objectives of the Study
This study was conducted to achieve several objectives. The objectives of
this study are:
i. To evaluate the performance of Marshall properties of hot mix asphalt
mixes with POFA as filler.
ii. To investigate the stripping potential due to moisture induced damage
of the asphalt mixes using POFA as filler and compared the tensile
strength and Tensile Strength Ratio (TSR) values.
1.4 Scope of the Study
The scope of this study focused on the effect of utilising Palm Oil Fuel Ash
(POFA) as filler material in hot mix asphalt. The gap graded gradation (SMA14)
was used as typical type of aggregate gradation in the mixture.
Each sample of SMA mixes was compacted as stipulated in the JKR
specifications (JKR/SPJ/2007) using Marshall design procedures. The stone mastic
asphalt mixes was modified using Palm Oil Fuel Ash (POFA). The size of POFA
that was used in the asphalt mixes is passing sieve size 75µm. The numbers of
samples prepared were divided into five categories where the percentage of POFA
used in this mixes varied from 0 to 100% by the total weight of the filler content.
These categories include unmodified samples, samples added with 25% of POFA,
samples added with 50% of POFA, samples added with 75% of POFA and samples
added with 100% of POFA in order to identify which mix that meets the desired
performances.
5
The addition of POFA in the mixes was used the method of ‘dry process’
where ash is added as part of the aggregate component first before it was blended
with the asphalt cement. The POFA was replaced a dust composition in the mixes
and reacted as filler in the mixes to improve properties of the mixture. Hydrated
lime was used in this study as stabilising agent. Laboratory stability and flow test
(Marshall) and indirect tensile strength test were performed on the mix design that
meets the best performances for volumetric properties and stripping resistance
(moisture-induced damage) measurements. The entire test was conducted at
Highway and Transportation Laboratory, UTM, Skudai, Johor, Malaysia.
1.5 Significant of the Study
From the result obtained in the end of this study, it can be proposed to
consider utilisation of POFA in stone mastic asphalt as filler material and to improve
resistance to moisture-induced damage in order to provide pavement with better
durability and strength by minimizing the distresses occurred in HMA pavement.
Hence, the road pavement will provide a safe and smooth riding for vehicular travel.
In addition, the utilisation of POFA can also be proposed to solve waste problem in
order to get sustainable development or use it as an alternative material in pavement
construction. Based on the findings, it can be proposed that utilisation of POFA in
the mixture should be taken into consideration for further studies in the future.
Utilisation of POFA in the pavement design is not well establish and explored.
Hence, contractors may have problem using POFA in the SMA mix cause by lack of
experience since this mix is considered as new mix for road pavement compared to
standard asphaltic concrete. So, from this study, the information obtained would
provide valuable information to agencies who desire to construct SMA pavement
using Palm Oil Fuel Ash (POFA) as filler material.
87
iv. Utilisation of POFA can reduce environment problem by using it as
filler material in HMA especially SMA and reduced the cost of
treatment and disposal of the waste.
Utilisation of POFA in HMA does not have any apparent effect to the mixes.
Therefore, it can be used or recycled rather than disposed in the landfill without any
purpose.
5.2 Recommendations
It is recommended that further studies be conducted on a variety of gradation
type such as dense graded and porous graded. Different percentage of POFA use can
be investigated to determine the effect to the mixture. Instead of moisture induced
damage resistance, other pavement deterioration due to rutting, fatigue and aging
should be studied in order to investigate the engineering properties of the mixes.
Detail study should be conducted to investigate the effect of utilisation of POFA in
hot mix asphalt mixture in order to provide strength and durable pavement by
minimising the distress occurred in HMA pavement. Hence, the road pavement will
provide a safe and smooth riding for vehicular travel. In addition, the most important
effort is to compile all the results obtained from all research that are related and
revised by a responsible board in order to make worth of it in improving the hot mix
asphalt performance according to Malaysian condition.
88
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