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The compressive dynamic modulus (E*) and the flexural modulus (MF) of an asphalt mixture are two of the main criteria in structural design and evaluation of flexible pavements. The correlation between these properties and the characterisation of their trends indicates a dynamic response of the asphalt concrete mixtures. In this study, a non-dimensional compressive dynamic modulus index (φE*) and a non-dimensional flexural modulus index (φMF) are proposed as ways to characterise the trends of changes of the dynamic modulus at different temperatures and frequencies. Analysis of Variance (ANOVA) and Ridge Regression were used in analysis of different variables of experiments and statistical modelling, respectively. ANOVA results showed that the proposed parameters are function of the temperature, frequency, and the interactions. Also, the analysis of trends showed that the values of φMF converge at 3% as temperature increases, while only a decreasing trend was observed for φE*. Furthermore, the correlation between φMF and φE* depends on the type of binder. The effect of binder type can be seen in the master curves. Furthermore, the analysis showed that the values of MF are at least 75% of E*, so this can be used as proximity factor to convert MF into E* for use in mechanistic pavement design. In addition, a statistical predictive model was proposed as function of MF, temperature and frequency. The outputs showed that MF and temperature at the frequency domain have significant effects on E* with a high correlation. In conclusion, the proposed parameters and the model can be used as a basis for development of a universal predictive model of dynamic modulus through trends of changes and material properties.
Ali Jamshidi; Greg White; Mehdi Hosseinpour. Revisiting the correlation between the dynamic modulus and the flexural modulus of hot mixture asphalt. Construction and Building Materials 2021, 296, 123697 .
AMA StyleAli Jamshidi, Greg White, Mehdi Hosseinpour. Revisiting the correlation between the dynamic modulus and the flexural modulus of hot mixture asphalt. Construction and Building Materials. 2021; 296 ():123697.
Chicago/Turabian StyleAli Jamshidi; Greg White; Mehdi Hosseinpour. 2021. "Revisiting the correlation between the dynamic modulus and the flexural modulus of hot mixture asphalt." Construction and Building Materials 296, no. : 123697.
Significant differences exist between pavement and building structures, particularly with respect to the type and mode of loading conditions: structural elements, beams and columns of buildings are subjected to static loads and pavement to dynamic loads. However, the design of structural members for buildings might need to address temporary dynamic loads due to wind, earthquake or other factors depending on building or structure height and application. In contrast, pavements are subjected to the moving loads of vehicles as well as to further loads due to temperature gradients. Since the layers of various materials used in pavements may vary in thickness and the statically indeterminate nature of pavement (due to the full contact with the bed soil layer or the lower layers), any deformation caused by changes in the moisture content and temperature can result in internal stresses in pavement structures. Consequently, analysis of pavement structures can be very complicated, requiring skills in material characterization, mathematics and modeling. In this regard, a useful book that covers various subjects in the pavement design and analysis was reviewed. Th details of each chapter were briefly explained. This book is recommended for consultant engineers and pavement researchers.
Ali Jamshidi. Analysis of Pavement Structures. By Animesh Das. CRC Press: Boca Raton, FL, USA, 2014; 194p; ISBN 978-1466558557. Sustainability 2021, 13, 6098 .
AMA StyleAli Jamshidi. Analysis of Pavement Structures. By Animesh Das. CRC Press: Boca Raton, FL, USA, 2014; 194p; ISBN 978-1466558557. Sustainability. 2021; 13 (11):6098.
Chicago/Turabian StyleAli Jamshidi. 2021. "Analysis of Pavement Structures. By Animesh Das. CRC Press: Boca Raton, FL, USA, 2014; 194p; ISBN 978-1466558557." Sustainability 13, no. 11: 6098.
In this study, an innovative methodology is proposed to characterize the short-term aging of asphalt binders using the matrix analysis method. The rotational viscosity and complex shear modulus of asphalt binders were chosen as target rheological properties for the analysis of aging. A set of square matrices was developed based on test temperatures and the synthetic additive wax content. Transformational short-term aging matrices were obtained that characterize the trend of the aging process as a function of binder type, temperature sweep, and additive percentage. The results of the matrix analysis show that the trend of short-term aging depends on the binder performance grade and the rheological characteristic chosen for the analysis of aging. In addition, transformational aging matrices can provide detailed information about the range of the aging rate and the trend in aging for each binder type. Furthermore, the components of the transformational matrices clearly show the sensitivity of the binders to aging. In conclusion, the matrix analysis of aging can be used to compare the effects of short-term aging of different asphalt binders.
Ali Jamshidi; Greg White; Wim Van Den Bergh; Seyed Omranian; Meor Hamzah. Development of a Matrix Analysis Methodology for Characterization of Short-Term Aging in Asphalt Binders Modified by Synthetic Wax. Sustainability 2021, 13, 5784 .
AMA StyleAli Jamshidi, Greg White, Wim Van Den Bergh, Seyed Omranian, Meor Hamzah. Development of a Matrix Analysis Methodology for Characterization of Short-Term Aging in Asphalt Binders Modified by Synthetic Wax. Sustainability. 2021; 13 (11):5784.
Chicago/Turabian StyleAli Jamshidi; Greg White; Wim Van Den Bergh; Seyed Omranian; Meor Hamzah. 2021. "Development of a Matrix Analysis Methodology for Characterization of Short-Term Aging in Asphalt Binders Modified by Synthetic Wax." Sustainability 13, no. 11: 5784.
Laboratory tests and field investigations show promising results of structural performance of warm mix asphalt (WMA). Also, the lower environmental burdens and fuel requirement in WMA production increase sustainability in the asphalt industry. However, there are challenges that significantly affect WMA performance and marketing in the future. In this paper, all these challenges are discussed, and the trend of WMA technology is evaluated. The statistics indicate that the energy market plays a pivotal role in enthusiasm for WMA. Lastly, WMA requires further investigations to meet requirements of post-modern pavement, as a new concept of pavement design in the 21st century.
Ali Jamshidi; Greg White. The Challenges of Warm Mix Asphalt as a Mature Technology. Lecture Notes in Civil Engineering 2020, 93 -102.
AMA StyleAli Jamshidi, Greg White. The Challenges of Warm Mix Asphalt as a Mature Technology. Lecture Notes in Civil Engineering. 2020; ():93-102.
Chicago/Turabian StyleAli Jamshidi; Greg White. 2020. "The Challenges of Warm Mix Asphalt as a Mature Technology." Lecture Notes in Civil Engineering , no. : 93-102.
Asphalt binders are modified to address various types of distresses, especially crack-related and permanent deformation of the pavement structure. This study focuses on evaluating the effects of Gripper, a new wax additive, on the performance of natural rubber latex (NRL)-modified asphalt binders. The morphology of the modified asphalt binders was also investigated. In this study, two percentages of NRL were considered, i.e., 3% and 6% based on the weight of the asphalt binder. Penetration value, softening point, rotational viscosity, storage stability, complex modulus, phase angle, rutting potential and torsional recovery parameters were determined to analyze the base asphalt binder (60/70) and NRL-modified asphalt binders (with and without Gripper). Also, the dispersion efficiency of NRL in the asphalt binder was observed using a polarizing optical microscope. The results demonstrate that the addition of NRL improved the performance of the asphalt binder in terms of rutting and fatigue resistance. The addition of Gripper has further improved the stability and mechanical performance of modified asphalt binders. An agglomerated and globular continuous network of mixed microstructures was formed in the modified asphalt binder irrespective of aging condition. Moreover, the unaged, short-term aged and long-term aged binders prepared with the incorporation of Gripper indicate uniformly dispersed network morphology. It can therefore be concluded that the modified asphalt binders prepared with the newly introduced additive portrays better resistance toward rutting and fatigue failures.
Ashiru Sani; Mohd Rosli Mohd Hasan; Khairul Anuar Shariff; Ali Jamshidi; Sharvin Poovaneshvaran; Khairul Anuar Shahid. Physico-Mechanical and Morphological Properties of Wax Latex-Modified Asphalt Binder. Iranian Journal of Science and Technology, Transactions of Civil Engineering 2020, 45, 865 -878.
AMA StyleAshiru Sani, Mohd Rosli Mohd Hasan, Khairul Anuar Shariff, Ali Jamshidi, Sharvin Poovaneshvaran, Khairul Anuar Shahid. Physico-Mechanical and Morphological Properties of Wax Latex-Modified Asphalt Binder. Iranian Journal of Science and Technology, Transactions of Civil Engineering. 2020; 45 (2):865-878.
Chicago/Turabian StyleAshiru Sani; Mohd Rosli Mohd Hasan; Khairul Anuar Shariff; Ali Jamshidi; Sharvin Poovaneshvaran; Khairul Anuar Shahid. 2020. "Physico-Mechanical and Morphological Properties of Wax Latex-Modified Asphalt Binder." Iranian Journal of Science and Technology, Transactions of Civil Engineering 45, no. 2: 865-878.
Paved surfaces must reliably bear heavy loads, often under challenging environmental and geotechnical conditions. These requirements are addressed through the use of high-quality, newly produced materials in pavement design. However, in remote locations, newly produced materials are often expensive or unavailable, making waste or alternative materials more attractive. Waste materials can be used in their natural condition but are more commonly stabilised or otherwise improved to meet performance targets. However, this practice can incorporate unwarranted risk into pavement design solutions. The decision to use waste materials in a pavement is a balance between technical risk, maintenance liability, available materials, environmental emissions and capital cost. This study reviews the use of waste materials in pavement design and construction. Reclaimed asphalt pavement (RAP) materials and processed waste plastic for pavement construction are considered. Additionally, blast furnace slag (BFS) and waste glass in pavement construction are evaluated. This review focuses on the effects of alternative materials on the properties of asphalt pavement. The results indicate that RAP is acceptable as an alternative material, while BFS, waste plastic and waste glass can be used under specific conditions. Also, the current and future challenges for the use of waste materials in the pavement industry are discussed.
Ali Jamshidi; Greg White. Evaluation of Performance and Challenges of Use of Waste Materials in Pavement Construction: A Critical Review. Applied Sciences 2019, 10, 226 .
AMA StyleAli Jamshidi, Greg White. Evaluation of Performance and Challenges of Use of Waste Materials in Pavement Construction: A Critical Review. Applied Sciences. 2019; 10 (1):226.
Chicago/Turabian StyleAli Jamshidi; Greg White. 2019. "Evaluation of Performance and Challenges of Use of Waste Materials in Pavement Construction: A Critical Review." Applied Sciences 10, no. 1: 226.
The effects of the reclaimed asphalt pavement (RAP) source and content on the dynamic modulus (E*) of hot mix asphalt concrete were characterized. Two parameters were proposed: the non-dimensional dynamic modulus-temperature index (∇ET*) and non-dimensional dynamic modulus-frequency index (∇Efr*). Parameter ∇Efr* indicates the increase of relative E* per unit percent RAP from different sources during frequency and temperature sweeps, while ∇ET* characterizes the reduction of relative E* per 1 °C temperature increase. An analysis of the results showed that ∇ET* of RAP mixes were 6.80% to 12% higher than those of the control samples, indicating less temperature susceptibility. Furthermore, an analysis of ∇Efr* trends showed temperature independency at higher temperature ranges. In addition, the results showed that the activation energy (AE) of the mixes was 1.51 MJ/mol/K to 9.86 MJ/mol/K higher than that of the control samples (without RAP), which depends on the RAP content and source. Moreover, E* linearly increases as AE increases. In conclusion, the increase of intermolecular forces owing to the higher AE in the blended binders increased the mix stiffness, which resulted in a higher E* in mixes containing RAP.
Ali Jamshidi; Greg White; Mehdi Hosseinpour; Kiyofumi Kurumisawa; Meor Othman Hamzah. Characterization of effects of reclaimed asphalt pavement (RAP) source and content on dynamic modulus of hot mix asphalt concrete. Construction and Building Materials 2019, 217, 487 -497.
AMA StyleAli Jamshidi, Greg White, Mehdi Hosseinpour, Kiyofumi Kurumisawa, Meor Othman Hamzah. Characterization of effects of reclaimed asphalt pavement (RAP) source and content on dynamic modulus of hot mix asphalt concrete. Construction and Building Materials. 2019; 217 ():487-497.
Chicago/Turabian StyleAli Jamshidi; Greg White; Mehdi Hosseinpour; Kiyofumi Kurumisawa; Meor Othman Hamzah. 2019. "Characterization of effects of reclaimed asphalt pavement (RAP) source and content on dynamic modulus of hot mix asphalt concrete." Construction and Building Materials 217, no. : 487-497.
Researchers dealing with pavements and experts on materials have been increasingly focused on the structural strength of the pavement materials without paying sufficient attention to the environment and cultural norms. In the 21st century, the concept of pavement design and rehabilitation needs to be modified owing to new requirements such as the additional structural loads derived from the climate change, environmental challenges, social requirements, and aging population. Therefore, the concept of post-modern pavement (PMP) was proposed to address the structural, sustainability, and socio-psychological requirements. In this review of the state-of-the-art, the potential of the interlocking concrete block pavement (ICBP) was evaluated based on its laboratory and field structural performance, sustainability, and social acceptance as a PMP in Japan. Therefore, the relevant literature in English and Japanese, including journals, conference proceedings, technical reports, books, and theses, over a span of 47 years (1971–2018), were studied. It was found that the structural and functional performances of the ICBP in different facilities were satisfying. Furthermore, owing to its waste material use, less noise emission, air purifying characteristics, and heat island reduction, the environmental performance of ICBP was in harmony with sustainable practices. In addition, pavements users, both able and differently abled, rated the ICBP as a more appropriate pavement system owing to its physical appearance, serviceability, aesthetic features, lower heat island effect, rapid maintenance, and positive psychologic effects after earthquake and tsunami events. As a result, the ICBP can be recommended as a PMP for the design and development of resilient transportation infrastructure assets in Japan.
Ali Jamshidi; Kiyofumi Kurumisawa; Gregory White; Tatsuo Nishizawa; Toshifumi Igarashi; Toyoharu Nawa; Jize Mao. State-of-the-art of interlocking concrete block pavement technology in Japan as a post-modern pavement. Construction and Building Materials 2019, 200, 713 -755.
AMA StyleAli Jamshidi, Kiyofumi Kurumisawa, Gregory White, Tatsuo Nishizawa, Toshifumi Igarashi, Toyoharu Nawa, Jize Mao. State-of-the-art of interlocking concrete block pavement technology in Japan as a post-modern pavement. Construction and Building Materials. 2019; 200 ():713-755.
Chicago/Turabian StyleAli Jamshidi; Kiyofumi Kurumisawa; Gregory White; Tatsuo Nishizawa; Toshifumi Igarashi; Toyoharu Nawa; Jize Mao. 2019. "State-of-the-art of interlocking concrete block pavement technology in Japan as a post-modern pavement." Construction and Building Materials 200, no. : 713-755.
In this study, the effect of fly ash (FA) as an alternative filler mineral was evaluated regarding workability, structural performance, durability, and its sustainability when prepared using hot (HMA) and warm mix asphalt (WMA) technologies. The results revealed that workability of HMA and WMA samples containing FA are comparable to the mixes containing cement powder, yet the WMA mixes containing 4% Sasobit® prepared at 145 °C exhibited the highest workability, regardless of filler type. However, the compaction energy index (CEI) of WMA samples containing FA is more sensitive to the Sasobit® content variations at each mixing temperature. Besides, use of FA as an alternative filler mineral increased the resilient modulus up to 7.5% as compared to HMA and WMA containing cement powder. The tensile strength ratios of asphalt mixtures containing FA are not only satisfied the design criteria, but it is also higher than those of samples with cement filler. Use of WMA technology improves sustainability in the construction phase, while incorporation of FA filler decreases the greenhouse gas emissions during the raw material manufacturing stage. Therefore, synergistic effects of using the WMA technology and FA improve the sustainability of both construction and raw material processing within the cradle to gate phases. In conclusion, a higher workability and resilient modulus test result together with less environmental emission indicate that the WMA technology using Sasobit® and FA as an alternative filler are showing great potential for the production of eco-friendly asphalt pavement.
Ali Jamshidi; Mohd Rosli Mohd Hasan; Mei Ting Lee. Comparative study on engineering properties and energy efficiency of asphalt mixes incorporating fly ash and cement. Construction and Building Materials 2018, 168, 295 -304.
AMA StyleAli Jamshidi, Mohd Rosli Mohd Hasan, Mei Ting Lee. Comparative study on engineering properties and energy efficiency of asphalt mixes incorporating fly ash and cement. Construction and Building Materials. 2018; 168 ():295-304.
Chicago/Turabian StyleAli Jamshidi; Mohd Rosli Mohd Hasan; Mei Ting Lee. 2018. "Comparative study on engineering properties and energy efficiency of asphalt mixes incorporating fly ash and cement." Construction and Building Materials 168, no. : 295-304.
Ali Jamshidi; Meor Othman Hamzah; Zulkurnain Shahadan; Ahmad Shukri Yahaya. Evaluation of the Rheological Properties and Activation Energy of Virgin and Recovered Asphalt Binder Blends. Journal of Materials in Civil Engineering 2015, 27, 04014135 .
AMA StyleAli Jamshidi, Meor Othman Hamzah, Zulkurnain Shahadan, Ahmad Shukri Yahaya. Evaluation of the Rheological Properties and Activation Energy of Virgin and Recovered Asphalt Binder Blends. Journal of Materials in Civil Engineering. 2015; 27 (3):04014135.
Chicago/Turabian StyleAli Jamshidi; Meor Othman Hamzah; Zulkurnain Shahadan; Ahmad Shukri Yahaya. 2015. "Evaluation of the Rheological Properties and Activation Energy of Virgin and Recovered Asphalt Binder Blends." Journal of Materials in Civil Engineering 27, no. 3: 04014135.
Ali Jamshidi; Kiyofumi Kurumisawa; Toyoharu Nawa; Meor Othman Hamzah. Analysis of structural performance and sustainability of airport concrete pavements incorporating blast furnace slag. Journal of Cleaner Production 2015, 90, 195 -210.
AMA StyleAli Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Meor Othman Hamzah. Analysis of structural performance and sustainability of airport concrete pavements incorporating blast furnace slag. Journal of Cleaner Production. 2015; 90 ():195-210.
Chicago/Turabian StyleAli Jamshidi; Kiyofumi Kurumisawa; Toyoharu Nawa; Meor Othman Hamzah. 2015. "Analysis of structural performance and sustainability of airport concrete pavements incorporating blast furnace slag." Journal of Cleaner Production 90, no. : 195-210.
Meor Othman Hamzah; Babak Golchin; Ali Jamshidi; Emmanuel Chailleux. Evaluation of Rediset for use in warm-mix asphalt: a review of the literatures. International Journal of Pavement Engineering 2014, 16, 809 -831.
AMA StyleMeor Othman Hamzah, Babak Golchin, Ali Jamshidi, Emmanuel Chailleux. Evaluation of Rediset for use in warm-mix asphalt: a review of the literatures. International Journal of Pavement Engineering. 2014; 16 (9):809-831.
Chicago/Turabian StyleMeor Othman Hamzah; Babak Golchin; Ali Jamshidi; Emmanuel Chailleux. 2014. "Evaluation of Rediset for use in warm-mix asphalt: a review of the literatures." International Journal of Pavement Engineering 16, no. 9: 809-831.
Warm mix asphalt using Sasobit® (Sasol Wax Company, Sasolburg, South Africa) is a new technology to reduce construction temperatures of asphalt mixes. This article presents the rheological properties of Sasobit-modified asphalt binder at high temperatures using response surface methodology. The results showed that the temperature at which the asphalt binder was blended with Sasobit had no effect on the high-temperature properties of Sasobit-modified asphalt binder, including viscosity and viscosity–temperature susceptibility, at each aging state. All empirical viscosity and aging models of Sasobit-modified asphalt binder follow second-order polynomial trends with test temperature, Sasobit contents, and their interactions at each aging condition.
Ali Jamshidi; M. O. Hamzah; M. A. Zahed. Rheological Evaluation and Modeling of Sasobit®-Modified Asphalt Binder at High Temperatures. Petroleum Science and Technology 2013, 31, 1574 -1584.
AMA StyleAli Jamshidi, M. O. Hamzah, M. A. Zahed. Rheological Evaluation and Modeling of Sasobit®-Modified Asphalt Binder at High Temperatures. Petroleum Science and Technology. 2013; 31 (15):1574-1584.
Chicago/Turabian StyleAli Jamshidi; M. O. Hamzah; M. A. Zahed. 2013. "Rheological Evaluation and Modeling of Sasobit®-Modified Asphalt Binder at High Temperatures." Petroleum Science and Technology 31, no. 15: 1574-1584.
Warm Mix Asphalt (WMA) technology has become increasingly popular in pavement construction because of its environmental benefits and its ability to improve the engineering properties of asphalt binders and mixtures. This state-of-the-art article focuses on various aspects of the WMA technology incorporating Sasobit® which includes the rheological characteristics of asphalt binders containing Sasobit®. The findings from laboratory tests and field performance of Sasobit®-modified WMA are also presented. This paper also reviews the life-cycle assessment, energy savings potential and greenhouse gas (GHG) emission reduction potential of WMA containing Sasobit®. The review concludes with a proposal for incorporating aspects related to environmental and energy-efficient asphalt mixes in Superpave™ mix design method.
Ali Jamshidi; Meor Othman Hamzah; Zhanping You. Performance of Warm Mix Asphalt containing Sasobit®: State-of-the-art. Construction and Building Materials 2013, 38, 530 -553.
AMA StyleAli Jamshidi, Meor Othman Hamzah, Zhanping You. Performance of Warm Mix Asphalt containing Sasobit®: State-of-the-art. Construction and Building Materials. 2013; 38 ():530-553.
Chicago/Turabian StyleAli Jamshidi; Meor Othman Hamzah; Zhanping You. 2013. "Performance of Warm Mix Asphalt containing Sasobit®: State-of-the-art." Construction and Building Materials 38, no. : 530-553.
Ali Jamshidi; Meor Othman Hamzah; Mohamad Yusri Aman. Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures. Materials Research 2012, 15, 628 -638.
AMA StyleAli Jamshidi, Meor Othman Hamzah, Mohamad Yusri Aman. Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures. Materials Research. 2012; 15 (4):628-638.
Chicago/Turabian StyleAli Jamshidi; Meor Othman Hamzah; Mohamad Yusri Aman. 2012. "Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures." Materials Research 15, no. 4: 628-638.
Incorporation of warm asphalt additives in conventional asphalt binder affects its rheological properties. This paper presents two Superpave™ binder parameters that were used to characterise the rheological properties of PG64 and PG70 asphalt binders blended with various Sasobit® contents and subjected to high and intermediate temperatures as well as under different ageing conditions. The parameters used to characterise the binder rheology at high and intermediate temperatures were the non-dimensional viscosity gradient (∇ ηS ) and non-dimensional Superpave™ rutting parameter (NSRP), respectively). The results indicated that the ∇ ηS trends differ depending on binder types, test temperatures and ageing conditions. The NSRP exhibited a significantly different trend for each Sasobit® content, depending on binder type and ageing conditions.
Meor Othman Hamzah; Ali Jamshidi; Kunnawee Kanitpong; Mohamad Yusri Aman. Parameters to characterise the effects of Sasobit®content on the rheological properties of unaged and aged asphalt binders. Road Materials and Pavement Design 2012, 13, 368 -375.
AMA StyleMeor Othman Hamzah, Ali Jamshidi, Kunnawee Kanitpong, Mohamad Yusri Aman. Parameters to characterise the effects of Sasobit®content on the rheological properties of unaged and aged asphalt binders. Road Materials and Pavement Design. 2012; 13 (2):368-375.
Chicago/Turabian StyleMeor Othman Hamzah; Ali Jamshidi; Kunnawee Kanitpong; Mohamad Yusri Aman. 2012. "Parameters to characterise the effects of Sasobit®content on the rheological properties of unaged and aged asphalt binders." Road Materials and Pavement Design 13, no. 2: 368-375.
Ali Jamshidi; Meor Othman Hamzah; Zulkurnain Shahadan. Selection of reclaimed asphalt pavement sources and contents for asphalt mix production based on asphalt binder rheological properties, fuel requirements and greenhouse gas emissions. Journal of Cleaner Production 2012, 23, 20 -27.
AMA StyleAli Jamshidi, Meor Othman Hamzah, Zulkurnain Shahadan. Selection of reclaimed asphalt pavement sources and contents for asphalt mix production based on asphalt binder rheological properties, fuel requirements and greenhouse gas emissions. Journal of Cleaner Production. 2012; 23 (1):20-27.
Chicago/Turabian StyleAli Jamshidi; Meor Othman Hamzah; Zulkurnain Shahadan. 2012. "Selection of reclaimed asphalt pavement sources and contents for asphalt mix production based on asphalt binder rheological properties, fuel requirements and greenhouse gas emissions." Journal of Cleaner Production 23, no. 1: 20-27.
Warm-mix asphalt (WMA) has been gaining popularity in the asphalt industry primarily because of its ability to lower the energy required to blend asphalt mixes, which in turn results in less fuel consumption, slower aging of the asphalt binder and reduced emission of greenhouse gases. This paper evaluates the effects of different quantities of a WMA additive known as Sasobit® on the required heat energy and the amount of CO2 produced to increase the temperature of two aggregates from three sources and one binder from 25 °C to the point of mixing. The results showed that incorporating 1% Sasobit® can potentially reduce the required heat energy and amount of CO2 produced by 2.8% and 3.0%, respectively, for all aggregate types and sources investigated. The paper also presented design charts that enable energy policy makers and engineers to select the appropriate Sasobit® content to produce the most cost effective asphalt mixture with less environmental impact. The design charts show that 1.6% Sasobit® content is the most suitable proportion to be blended into the asphalt binder without compromising pavement resistance against fatigue failure. Two similar aggregates from different sources may exhibit similar specific gravities, but their specific heat capacities can vary widely. These differences have a significant effect on the required heat energy, asphalt production cost and the amount of emissions released into the environment.
Meor Othman Hamzah; Ali Jamshidi; Zulkurnain Shahadan. Evaluation of the potential of Sasobit® to reduce required heat energy and CO2 emission in the asphalt industry. Journal of Cleaner Production 2010, 18, 1859 -1865.
AMA StyleMeor Othman Hamzah, Ali Jamshidi, Zulkurnain Shahadan. Evaluation of the potential of Sasobit® to reduce required heat energy and CO2 emission in the asphalt industry. Journal of Cleaner Production. 2010; 18 (18):1859-1865.
Chicago/Turabian StyleMeor Othman Hamzah; Ali Jamshidi; Zulkurnain Shahadan. 2010. "Evaluation of the potential of Sasobit® to reduce required heat energy and CO2 emission in the asphalt industry." Journal of Cleaner Production 18, no. 18: 1859-1865.
Meor Othman Hamzah; Ali Jamshidi; Z. Shahadan; Mohd Rosli Mohd Hasan; A.S. Yahaya. Evaluation of Engineering Properties and Economic Advantages of WMA using Local Materials. Journal of Applied Sciences 2010, 10, 2433 -2439.
AMA StyleMeor Othman Hamzah, Ali Jamshidi, Z. Shahadan, Mohd Rosli Mohd Hasan, A.S. Yahaya. Evaluation of Engineering Properties and Economic Advantages of WMA using Local Materials. Journal of Applied Sciences. 2010; 10 (20):2433-2439.
Chicago/Turabian StyleMeor Othman Hamzah; Ali Jamshidi; Z. Shahadan; Mohd Rosli Mohd Hasan; A.S. Yahaya. 2010. "Evaluation of Engineering Properties and Economic Advantages of WMA using Local Materials." Journal of Applied Sciences 10, no. 20: 2433-2439.