Burak Sengoz
Ege University, İnşaat Mühendisliği, Faculty Member
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Trafik hacmindeki ve dingil yüklerindeki artışlar ve üretim hataları, yollardan beklenen performansı ve hizmet ömrünü düşürmekte, tekerlek izi oluşumu, yorulma ve düşük sıcaklık... more
Trafik hacmindeki ve dingil yüklerindeki artışlar ve üretim hataları, yollardan beklenen performansı ve hizmet ömrünü düşürmekte, tekerlek izi oluşumu, yorulma ve düşük sıcaklık çatlakları gibi bozulmalara sebep olmaktadır. Kaplamanın öngörülen ömür ve konfor düzeyinin sağlanması, büyük ölçüde karışımlarda kullanılan bitümlü bağlayıcının özelliklerine bağlıdır. Bu özelliklerin en önemlilerinden biri yaşlanmadır. Yaşlanma, özellikle oksidasyon nedeni ile asfaltın sertleşmesi olarak tanımlanmaktadır. Bu çalışmada, bitümlü karışımlarda yaşlanma üzerinde asfalt film kalınlığının etkisini incelemek üzere kısa (135ºC, 4 saat) ve uzun dönem (85ºC, 120 saat) yaşlandırılmış numuneler üzerine esneklik modülü deneyi uygulanmıştır. Esneklik modülü model eğrileri film kalınlığına bağlı olarak ...
All railway systems are more reliable than other transit modes for the operating point of view. Because most of the other transit modes are affected from random conditions of the traffic, in which demand-supply balances cannot be adjusted... more
All railway systems are more reliable than other transit modes for the operating point of view. Because most of the other transit modes are affected from random conditions of the traffic, in which demand-supply balances cannot be adjusted warrantably for the most of operating time. In this case, capacity of the transit mode may not be modulated for the transportation demand. However, especially for metros, capacity analysis is the major and most applied criterion for the operation planning of the transit system, because of the completely controlled traffic conditions. In this study, four different capacity calculation methods are discussed to obtain a suitable approach to operational purposes for rail transit systems. Some of these methods consider not only physical capacity of line and train elements of transit system, but also operational factors such as train control and signaling, station dwells, passenger loading levels and train performance. Also, operational plan of Izmir Lig...
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The use of polymer modified bitumen has become a very important part of pavement construction due to its superior performance, including less ageing, enhanced rutting resistance and lower fatigue cracking properties. The polyethylene is a... more
The use of polymer modified bitumen has become a very important part of pavement construction due to its superior performance, including less ageing, enhanced rutting resistance and lower fatigue cracking properties. The polyethylene is a type of product normally not used as additive to bitumen, generally showing a congealing point of 92-100°C. Areas where it has been used are for instance in plastics and polishes, as thickener for lubricating oils and petrolatum and as paraffin wax improver/up-grader. Although the many significant researches which have been carried out related to the polymer modified bitumen in road applications, more studies should be undertaken on the compatibility, in the interaction between polymer and the different sources bitumens according to the needs of refineries in different countries. The main purpose behind this study is to minimize the fatigue damage of waxes within bitumens obtained from different sources. For this purpose; bitumen samples were modi...
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Porous asphalt pavement is defined as an asphalt concrete that is designed with open gradation aggregate which helps in removing the water with an air void content of about 20% by creating drainage channels. Open gradation consists of... more
Porous asphalt pavement is defined as an asphalt concrete that is designed with open gradation aggregate which helps in removing the water with an air void content of about 20% by creating drainage channels. Open gradation consists of large amounts of coarse aggregates and small amounts of fine aggregates. The water is drained due to this hollow structure, this air void content in the porous asphalt mixture which inevitably decreases with time is the main parameter affecting the service life as well as the structural and functional performance. Moreover, the reduction in air void content is one of the main reasons for the loss of permeability in porous asphalt pavements and this lead to the increase in pavement density under heavy traffic conditions. Each country has its own technical asphalt specification involving the required compaction energy and temperature. This study involves the effect of compaction temperatures and numbers on the air void in porous asphalt pavements prepare...
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The aim of this research was to investigate fundamental mechanical properties of different bamboo types which are relevant to construction work .Four bamboo species imported from IHBT Palampur were tested namely Dendrocalumus Hamiltonii,... more
The aim of this research was to investigate fundamental mechanical properties of different bamboo types which are relevant to construction work .Four bamboo species imported from IHBT Palampur were tested namely Dendrocalumus Hamiltonii, Bambusa Nutans, Bambusa Tulda, Bambusa Balcoa. These species were subjected to three point bending test, tensile test parallel to grain, compression test parallel to axis of culm, shear test parallel to fibre. The results showed that Bambusa Nutans possess excellent mechanical properties in compression and tensile strength, which indicates it can be used as construction material. Most of the bamboo species are hollow but this study takes into account a bamboo which is nearly solid named as Bambusa tulda.The research revealed out that solid bamboo is not too far from hollow one in terms of mechanical properties and can equally be utilized for construction work.
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Research Interests: Mathematics, Computer Science, Asphalt, Inference, Mathematical Sciences, and 12 moreHybrid Learning, System, adaptive neuro fuzzy inference system (ANFIS), Membership Function, Adaptive Network Based Fuzzy Inference System, Bitumen, Fuzzy Inference System, Modulus, Dynamic Shear Rheometer, Ethylene Vinyl Acetate, Complex modulus, and Statistical Method
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In the last decades, increasing awareness about the environment has tremendously contributed to the concerns related with disposal of the generated solid wastes. With the scarcity of space for land filling area and due to its ever... more
In the last decades, increasing awareness about the environment has tremendously contributed to the concerns related with disposal of the generated solid wastes. With the scarcity of space for land filling area and due to its ever increasing cost, waste utilization has become an attractive alternative to disposal. Therefore, the use of waste products in asphalt not only makes it economical, but also helps in reducing disposal problems. The purpose of the experimental study is to investigate the possibility of using granular Poly-Ethylene Terephthalate (PET) waste in asphalt mixes which would replace a portion of mineral coarse aggregate. For this purpose the mechanical properties of asphalt mixes involving different contents PET waste were compared with control samples. This study focused on the parameters of Marshall stability, flow, Marshall quotient (stability-to-flow ratio), Indirect Tensile Strength as well as rutting test. Experimental results exhibited that the PET modified a...
ABSTRACT In last decades, warm mix asphalt (WMA) has become a significant alternative paving technology to hot mix asphalt (HMA), due to the relatively low temperatures required to heat asphalt during production and placement, minimising... more
ABSTRACT In last decades, warm mix asphalt (WMA) has become a significant alternative paving technology to hot mix asphalt (HMA), due to the relatively low temperatures required to heat asphalt during production and placement, minimising environmental damage while maintaining the advantages of HMA. However, low production and placement temperatures may result moisture-induced damage of asphalts. The objective of this study was to evaluate the moisture susceptibility characteristics of asphalts containing natural zeolite and its comparison with synthetic zeolite, organic, and chemical WMA additives. The stripping properties and moisture susceptibility characteristics of the specimens have been evaluated by means of the Nicholson stripping test and modified Lottman test, respectively.
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The objective of this study was to improve the performance of flexible pavement through suitable aggregate gradation. Thus, initially, the dynamic modulus of asphalt mixtures |E*| for different aggregate gradations were predicted, and... more
The objective of this study was to improve the performance of flexible pavement through suitable aggregate gradation. Thus, initially, the dynamic modulus of asphalt mixtures |E*| for different aggregate gradations were predicted, and suitable aggregate gradation was determined. Then the performance of three different pavement structures for two aggregate gradations (Mid and Suitable), using AASHTOWare Pavement ME Design 2.5. 5, were evaluated for local conditions of Izmir, Turkey. The analysis result revealed that using suitable values compared to middle values increased the |E*| and improved the rutting and fatigue resistance of all pavement structures for any traffic levels. The output of this study can be used as a guide for hot mixed asphalt mix design and pavement design based on Mechanistic-Empirical Pavement Design Guide as well.
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The raise in axle loads, heavy traffic, design and construction errors in the last two decade increase the failures such as rutting, fatigue and low temperature cracking. These deformations decrease the level of performance and service... more
The raise in axle loads, heavy traffic, design and construction errors in the last two decade increase the failures such as rutting, fatigue and low temperature cracking. These deformations decrease the level of performance and service life of the roads. Aging phenomenon, which is defined as the hardening of asphalt binder due to loss of volatile components and oxidation, is the primary factor of the above-mentioned failures. This study aims to evaluate the current standard (AASHTO R30) regarding to the laboratory aging procedure with the new method proposed by National Cooperative Highway Research Program (NCHRP 09-54). In order to investigate the aging effects, the indirect tensile strength tests have been performed on unaged, short and long term laboratory aged asphalt concrete specimens. The aging level of the asphalt concrete specimens had been evaluated through aging indices.
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The predicted performance and service life of the pavement depend largely on the properties of bitumen used in the mixtures. The most important feature of bitumen, which has profound effect on the performance of the road is durability.... more
The predicted performance and service life of the pavement depend largely on the properties of bitumen used in the mixtures. The most important feature of bitumen, which has profound effect on the performance of the road is durability. The durability of bitumen is expressed as the resistance to aging. In this study, the bituminous mixture aging was performed instead of bitumen aging in order to represent the aging in the field in the best possible way. The aim of this paper is to evaluate different proposed laboratory aging methods (NCHRP 09-52, NCHRP 09-54 and RILEM) in relation with the current Standard AASHTO R30 (Standard Practice For Mixture Conditioning of Hot Mix Asphalt standard) and to make comparison with the samples performance taken from the field in terms of Indirect Tensile Strength (ITS). The level of aging has also been compared with the samples taken from recently constructed pavement surface and from the five years old pavement surface. Results depicted that, labor...
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Utilization of warm mix asphalt (WMA) in pavement construction is a relatively new technology, therefore there is nearly no chance to practically evaluate the long-term characteristics of the existing WMA pavements. Due to lower... more
Utilization of warm mix asphalt (WMA) in pavement construction is a relatively new technology, therefore there is nearly no chance to practically evaluate the long-term characteristics of the existing WMA pavements. Due to lower application temperatures, it can intuitively be expected that a WMA pavement would be less subjected to aging-induced failures. This study attempts to evaluate the effects of a chemical WMA additive on aging characteristics of bituminous mixtures. The chemical additive tested within the scope of this study is a combination of both organic additive and a kind of cationic surfactant developed by Akzo Nobel. Short- and long-term aging conditions were simulated on mixtures containing various contents of chemical WMA additive as well as on control specimens. To estimate the proportions of hardening, aging indices were determined based on indirect tensile strength (ITS) results. The aging indices unveiled that the specimens containing chemical WMA additive demonst...
Trafik hacmindeki ve dingil yuklerindeki artislar ve uretim hatalari, yollardan beklenen performansi ve hizmet omrunu dusurmekte, tekerlek izi olusumu, yorulma ve dusuk sicaklik catlaklari gibi bozulmalara sebep olmaktadir. Kaplamanin... more
Trafik hacmindeki ve dingil yuklerindeki artislar ve uretim hatalari, yollardan beklenen performansi ve hizmet omrunu dusurmekte, tekerlek izi olusumu, yorulma ve dusuk sicaklik catlaklari gibi bozulmalara sebep olmaktadir. Kaplamanin ongorulen omur ve konfor duzeyinin saglanmasi, buyuk olcude karisimlarda kullanilan bitumlu baglayicinin ozelliklerine baglidir. Bu ozelliklerin en onemlilerinden biri yaslanmadir. Yaslanma, ozellikle oksidasyon nedeni ile asfaltin sertlesmesi olarak tanimlanmaktadir. Bu calismada, bitumlu karisimlarda yaslanma uzerinde asfalt film kalinliginin etkisini incelemek uzere kisa (135oC, 4 saat) ve uzun donem (85oC, 120 saat) yaslandirilmis numuneler uzerine esneklik modulu deneyi uygulanmistir. Esneklik modulu model egrileri film kalinligina bagli olarak incelendiginde yaslanmaya iliskin optimum asfalt film kalinliginin 9-10μ araliginda degistigi gorulmustur. Anahtar Kelimeler : Asfalt film kalinligi, bozulmalar,oksitlenme, yaslanma.
Pavement management systems are crucial because of monitoring the current pavement condition to supply safe, efficient, comfortable and durable riding surface for vehicles. Driving safety is the most important issue, which is closely... more
Pavement management systems are crucial because of monitoring the current pavement condition to supply safe, efficient, comfortable and durable riding surface for vehicles. Driving safety is the most important issue, which is closely related to pavement surface texture. The texture of the pavement surface and its ability to resist the polishing effect of heavy traffic is an important parameter in providing necessary skidding resistance during the service life. In this study, 4 different asphalt pavement sections located in Izmir/TURKEY with having different traffic characteristics were investigated every three months for two years aiming to evaluate the effect of traffic volume on the surface textural and frictional properties of the pavement. The textural properties were evaluated using sand patch test (SPT) and a 3D Laser Scanning System (LSS), while Dynamic Friction Tester (DFT) was employed to assess the frictional properties. As a result, lower Mean Texture Depth (MTD) and Mean...
The determination of mixing and compaction temperatures through the Equiviscous method has been defined as the standard method and it is designed for the base bitumen (unmodified bitumen) based on the viscosity measurements. The... more
The determination of mixing and compaction temperatures through the Equiviscous method has been defined as the standard method and it is designed for the base bitumen (unmodified bitumen) based on the viscosity measurements. The implementation of the Equiviscous method for the modified bitumen resulted in high mixing and compaction temperatures which may not be required during the construction of the asphalt mixtures. This study aims to investigate several alternative methods proposed in the literature named as high shear rate method, zero shear viscosity method, steady shear flow method, and phase angle method. Besides, the obtained mixing and compaction temperatures results are compared with the standard (equiviscous) method. For this purpose, 50/70 penetration grade bitumen modified with 5 % elastomeric type – Styrene Butadiene Styrene (SBS), and 1.5 % Reactive Elastomeric Terpolymer type – Elvaloy (RET) has been used. The study also aims to measure the applicability of the propo...
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In the recent times, asphalt binder modification has emerged an inevitable alternative in the paving industry to ensure better performing pavements against the distresses caused by common factors such as; moisture susceptibility and... more
In the recent times, asphalt binder modification has emerged an inevitable alternative in the paving industry to ensure better performing pavements against the distresses caused by common factors such as; moisture susceptibility and high-temperature sensitivity of asphalt binders. Nanomaterials, as asphalt-modifiers, have proved to be the most promising materials in the industry owing to their higher active surface area and small particle size. This study was devoted to assessing the modification influence of three different types of nanomaterials, including nano-Bentonite, nano-CaCO3, and ZycoTherm, on the properties of asphalt binder and HMA. Conventional and rheological tests on asphalt binders, as well as, Marshall mix design and modified Lottman test on laboratory-prepared HMA specimens were conducted in order to signify the influence of nanomodification. The research findings suggested that nanomaterials can potentially enhance the high-temperature susceptibility resistance, s...
Wax in bitumen has been referred to as petroleum wax and is obtained from refining of paraffinic crude oils. The effects of wax on bitumen properties depend on the following factors: the source, chemical composition and rheology of the... more
Wax in bitumen has been referred to as petroleum wax and is obtained from refining of paraffinic crude oils. The effects of wax on bitumen properties depend on the following factors: the source, chemical composition and rheology of the bitumen as well as the content, type, composition and crystallisation of the wax. There is a lack of literature reviews related to the effect of waxes on the rheology and properties of bitumen. The scope of this study is to evaluate the rheological properties of waxy bitumens obtained from different sources. Following the determination of wax contents by differential scanning calorimetry (DSC) and EN 12606-1, waxy bitumen properties were evaluated using conventional methods, rotational viscosity, dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The intermediate and high-temperature performances levels of bitumen were also determined according to the Superpave system by a DSR test performed on aged and unaged samples. Rutting performance of bitumens has been evaluated using zero shear viscosity (ZSV) and multiple stress creep recovery (MSCR) tests.
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Abstract In the last few years, transparent bitumen has been used instead of traditional black bitumen in order to construct roads in wide range of colors. Roads in natural earth color to bright red color, or livelier light blue to yellow... more
Abstract In the last few years, transparent bitumen has been used instead of traditional black bitumen in order to construct roads in wide range of colors. Roads in natural earth color to bright red color, or livelier light blue to yellow or green or in any requested color can be constructed using transparent bitumen. This paper reports the determination and comparison of the rheological properties of traditional black bitumen and transparent bitumen. Both base black bitumen and transparent bitumen were modified with 5% elastomeric type – Styrene Butadiene Styrene (SBS), and 2% plastomeric type – Ethylene Vinyl Acetate (EVA) polymer. Base and polymer modified bitumens were subjected to conventional and rheological bitumen tests. The intermediate and high temperature performances levels of bitumen were determined according to the Superpave system by performing DSR test on aged and unaged samples. Rutting performance of each bitumen sample was evaluated through zero shear viscosity (ZSV) and multiple stress creep recovery (MSCR) tests. Furthermore, the behavior of both traditional black bitumen and transparent bitumen at high and low frequencies levels at different temperatures were investigated by performing the Frequency Sweep test.
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In recent years, environmental protection is increasingly becoming a major issue in transportation including asphalt production. Despite the fact that hot mix asphalt (HMA) is widely used around the world, some recent studies suggest that... more
In recent years, environmental protection is increasingly becoming a major issue in transportation including asphalt production. Despite the fact that hot mix asphalt (HMA) is widely used around the world, some recent studies suggest that using warm mix asphalt (WMA) technology reduces the production and placement temperature of asphalt mixes. Currently, a common way of producing WMA is through the utilization of additives. This paper firstly characterizes the effect of WMA additives (organic, chemical, water-containing additives) on base bitumen properties. Following the determination of optimum bitumen content of the mixtures with different WMA additives through Marshall test, Hamburg wheel-tracking device is used to measure the permanent deformation characteristics of WMA mixtures. Based on the findings of this study, the utilization of WMA additives helps in the reduction in viscosity values which in return decreases mixing and compaction temperature leading to the reduction in energy costs as well as emissions. Besides, it can be concluded that all WMA mixtures performed better than HMA mixtures in the matter of rut depth.
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The raise in the level of living conditions and social and economic development during the last three decades increased the demand for safe and comfortable pavements with a higher driving quality. It is obvious that this demand can only... more
The raise in the level of living conditions and social and economic development during the last three decades increased the demand for safe and comfortable pavements with a higher driving quality. It is obvious that this demand can only be satisfied with proper pavement design procedures aiming at resistance to deformations with a longer service life. Nevertheless, the commonly encountered distresses such as rutting, fatigue and low temperature cracking occurring in pavements due to increase in axle loads, heavy traffic, construction error and climatic conditions decrease the expected performance and service life of the roads. The level of performance and service life of the roads has a close relationship with the aging property of the asphalt binder. Aging phenomenon, which is the primary factor for contributing to the above-mentioned failures, is defined as the hardening of asphalt binder due to loss of volatile components and oxidation. High permeability, high air voids and thin asphalt film thicknesses are the primary causes of the aging of asphalt binder. This study is aimed at determining the relationship between the asphalt film thickness and the short-term (aging of asphalt binder during mixing with aggregate, transportation to job-site, compaction) and long-term (during service life of the road) aging characteristics of hot mix asphalt. Resilient modulus test is conducted on the compacted specimens using Superpave Gyratory Compactor in order to obtain optimum film thickness for satisfactory mix durability. From the figures plotted between asphalt film thickness and resilient modulus of the aged samples, accepted quadratic functions and an optimum asphalt film thickness is obtained. For the covering abstract see ITRD E121480.
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Research Interests: Prevention and Aggregate
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The bitumen which is an irreplaceable material of construction industry, especially in transportation, has become a primary field of research with the improvements in material science technologies, in order to build more robust and... more
The bitumen which is an irreplaceable material of construction industry, especially in transportation, has become a primary field of research with the improvements in material science technologies, in order to build more robust and reliable roads and buildings. It has become a standard procedure to add several types of materials into the bitumen. Testing the modified bitumen is extermely important
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This paper presents a laboratory study of modified bitumen containing styrene-butadiene-styrene (SBS) copolymer. Polymer modified bitumen (PMB) samples have been produced by mixing a 50/70 penetration grade unmodified (base) bitumen with... more
This paper presents a laboratory study of modified bitumen containing styrene-butadiene-styrene (SBS) copolymer. Polymer modified bitumen (PMB) samples have been produced by mixing a 50/70 penetration grade unmodified (base) bitumen with SBS Kraton D1101 copolymer at five different polymer contents. The fundamental characteristics of the SBS PMB samples have been determined using conventional methods. The morphology of the samples as well as the percent area (%) distribution of SBS polymers throughout the base bitumen have been characterized and determined by means of fluorescence microscopy and Qwin Plus image analysis program, respectively. The mechanical properties of the hot-mix asphalt (HMA) containing SBS PMBs have also been analyzed and compared with HMA incorporating base bitumen. The effect of polymer addition on the short and long term aging characteristics of HMA have been evaluated by indirect tensile strength (ITS) test. The results indicated that polymer modification improved the conventional properties (penetration, softening point, etc.) and the mechanical properties (Marshall, ITS, etc.) of the base bitumen. It was also concluded that at low polymer contents, the samples revealed the existence of dispersed polymer particles in a continuous bitumen phase, whereas at high polymer contents a continuous polymer phase has been observed. Moreover, it was found out that the polymer addition minimizes the short and long term aging of HMA.
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Research Interests: Engineering, Construction Materials, Sensitivity Analysis, Stability, Creep, and 14 moreSteel, Solid waste, Hazardous Materials, Aggregate, HYDROCARBONS, Electrical Conductivity, Bitumen, Tensile Strength, Electric Conductivity, Hot Mix Asphalt, Steel Slag, Slag, Indirect tensile Strength, and Mechanical Property
ABSTRACT The goal of this study is to design an expert system that automatically classifies the microscopic images of polypropylene fiber (PPF) modified bitumen including seven different contents of fibers. Optical microscopy was used to... more
ABSTRACT The goal of this study is to design an expert system that automatically classifies the microscopic images of polypropylene fiber (PPF) modified bitumen including seven different contents of fibers. Optical microscopy was used to capture the images from thin films of polypropylene fiber modified bitumen samples at a magnification scale of 100 ×. A total of 313 images were pre-processed, and features were extracted and selected by the exhaustive search method. The k-nearest neighbor (k-NN) and multiclass support vector machine (SVM) classifiers were applied to quantify the representation capacity. The k-NN and multiclass SVM classifiers reached an accuracy rate of 87% and 86%, respectively. The results suggest that the proposed expert system can successfully estimate the concentration of PPF in bitumen images with good generalization characteristics. 11 Engineers.
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ABSTRACT Asphalt modification with polymers has utilized the advantages of nanotechnology including nanoclays as one of the components in addition to polymers. This led to the metamorphosis of polymer-modified asphalts into a new class of... more
ABSTRACT Asphalt modification with polymers has utilized the advantages of nanotechnology including nanoclays as one of the components in addition to polymers. This led to the metamorphosis of polymer-modified asphalts into a new class of material called polymer-modified asphalt nanocomposites which offer the cumulative characteristic features obtained by the polymer modification of asphalt as well as the innovative properties experienced from polymer nanocomposites. Polymer-modified asphalt nanocomposites including styrene butadiene and ethylene vinyl acetate have revealed additional features which were not available in polymer-modified asphalts. The compositional complexity provides a great challenge in addressing the structure property relations prevailing in these materials. This paper describes microstructural features as determined by Qwin Plus Software analysis and the rheological properties on compositional changes.