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Emad Kassem
Department of Civil and Environmental Engineering, University of Idaho, Moscow, ID 83844, USA

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Short communication
Published: 13 August 2021 in Case Studies in Construction Materials
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The ambient air temperature greatly influences tire-pavement noise measurements. Therefore, various international standards recommended a temperature correction factor to compensate for noise measurements at varying temperatures. This temperature correction factor is developed based on the local environment (temperature varying from 5 °C to 35 °C) and generally varies with different pavements. Pavements in the Gulf region experienced harsh weather conditions, with temperatures often crossing 40 °C during summer. This study investigates the effect of air temperature on noise measurements in hot climatic conditions of Gulf regions. The On-Board Sound Intensity (OBSI) noise measurements technique was used to collect the noise data at different temperatures ranging from 25 °C to 43 °C. A linear regression analysis was performed to verify the relationship between noise and temperature. Three statistical criteria were selected to avoid parasitic phenomena and contamination of noise data during measurement. Statistical analysis demonstrated a strong relationship between noise intensity and temperature, especially at a frequency above 1250 Hz. Spectra analysis of the noise measurements also showed that the temperature coefficient is frequency-dependent, and generally, a frequency above 1250 Hz has a higher temperature coefficient. OBSI test results at various pavements with different mean texture depths of dense-graded pavement showed that the temperature coefficient varied from 0.052 dB/°C to 0.142 dB/°C. There is an apparent trend of decreasing temperature coefficient with increasing mean texture depth of dense graded asphalt pavements. However, no clear dependence on the temperature coefficient on the vehicle’s speed is observed in this study.

ACS Style

Okan Sirin; Ohiduzzaman; Emad Kassem. Influence of temperature on tire-pavement noise in hot climates: Qatar case. Case Studies in Construction Materials 2021, 15, e00651 .

AMA Style

Okan Sirin, Ohiduzzaman, Emad Kassem. Influence of temperature on tire-pavement noise in hot climates: Qatar case. Case Studies in Construction Materials. 2021; 15 ():e00651.

Chicago/Turabian Style

Okan Sirin; Ohiduzzaman; Emad Kassem. 2021. "Influence of temperature on tire-pavement noise in hot climates: Qatar case." Case Studies in Construction Materials 15, no. : e00651.

Research article
Published: 29 April 2021 in Advances in Civil Engineering
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There is pressing and growing demand from the public to design and construct roads with a low noise level. This paper investigated the acoustic performance of asphalt pavements in the State of Qatar to assist transport authorities in designing and constructing quieter pavements. In this study, a field-testing setup was assembled to measure the tire-pavement noise of dense-graded asphalt (DGA) pavements at the source using the on-board sound intensity (OBSI) method. The repeatability and reproducibility of test results demonstrated that the assembled OBSI test setup could measure the sound intensity with excellent repeatability and reproducibility. The measured noise level of existing pavements varied from 101.8 dBA to 106.2 dBA depending on the age of pavement sections. Measured noise levels of pavements in Qatar were higher than typical DGA pavements in Europe and the US. Test results also demonstrated that the acoustic performance of pavements in Qatar deteriorates faster compared to those in the US and Europe. The findings of this study demonstrate that there is a need to consider alternative asphalt mixture designs in Qatar and the Arabian Gulf. The results also showed a good correlation between the mean texture depth of studied pavement sections and noise level, especially at the low-frequency range.

ACS Style

Okan Sirin; Ohiduzzaman; Emad Kassem; Wahid Hassan. Acoustic Performance Evaluation of Dense-Graded Asphalt Pavements in Qatar. Advances in Civil Engineering 2021, 2021, 1 -16.

AMA Style

Okan Sirin, Ohiduzzaman, Emad Kassem, Wahid Hassan. Acoustic Performance Evaluation of Dense-Graded Asphalt Pavements in Qatar. Advances in Civil Engineering. 2021; 2021 ():1-16.

Chicago/Turabian Style

Okan Sirin; Ohiduzzaman; Emad Kassem; Wahid Hassan. 2021. "Acoustic Performance Evaluation of Dense-Graded Asphalt Pavements in Qatar." Advances in Civil Engineering 2021, no. : 1-16.

Journal article
Published: 13 February 2021 in Construction and Building Materials
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Alkali silica reaction (ASR), commonly referred to as “concrete cancer”, is a major durability problem in concrete structures. ASR is a chemical reaction that occurs between the reactive amorphous silica from the natural aggregates and the alkalis in cement in the presence of moisture. This reaction causes undue expansion and cracks in hardened concrete which over time results in deterioration. The use of supplementary cementitious materials (SCMs) has been proven effective to minimize ASR distress. In this study, a synergistic function of glass powder was evaluated in binary and ternary blends with conventional SCMs (slag and silica fume) for ASR mitigation. The ASR mitigation was evaluated using the accelerated mortar bar test (AMBT) and miniature concrete prism test (MCPT) methods. Additional testing including the flow test, strength activity index (SAI), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and energy-dispersive x-ray spectral analysis (EDS) was conducted to examine the pozzolanic activity, microstructural analysis, and chemical composition. The results demonstrated that the use of SCMs along with glass powder reduce ASR expansion substantially. The binary or ternary blends of 20% replacement of glass powder, slag, or silica fume can be utilized for ASR mitigation without compromising other concrete properties. Also, the ternary system containing glass powder with other conventional SCMs performed better compared to individual use of SCMs to mitigate ASR. These results were also supported by the findings of the microstructure and chemical analysis, in which the glass powder and SCMs were found to reduce the cracks due to ASR expansion.

ACS Style

Ebenezer O. Fanijo; Emad Kassem; Ahmed Ibrahim. ASR mitigation using binary and ternary blends with waste glass powder. Construction and Building Materials 2021, 280, 122425 .

AMA Style

Ebenezer O. Fanijo, Emad Kassem, Ahmed Ibrahim. ASR mitigation using binary and ternary blends with waste glass powder. Construction and Building Materials. 2021; 280 ():122425.

Chicago/Turabian Style

Ebenezer O. Fanijo; Emad Kassem; Ahmed Ibrahim. 2021. "ASR mitigation using binary and ternary blends with waste glass powder." Construction and Building Materials 280, no. : 122425.

Article in press
Published: 23 December 2020 in International Journal of Pavement Research and Technology
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There are various models for predicting the friction or skid number of asphalt pavements based on inputs such as aggregate characteristics, aggregate gradation, and traffic level. However, existing models are deterministic as they incorporate mean values of the input parameters and yield an average skid number value for a pavement section. Consequently, these models are not capable of accounting for variability in material properties and associated variation in the predicted skid number values. This study aims to develop a probabilistic approach that determines the mean as well as the variation in skid number in a pavement section. The efficacy of this approach is demonstrated by selecting one of the validated models that incorporate a wide range of aggregate characteristics. The results showed that while the average skid number predicted by the deterministic model may satisfy a required threshold/specification value, a fair percentage of the distribution could fall below the required value. The probabilistic approach is useful for engineers to determine the effect of aggregate characteristics on skid resistance distribution and to identify risks associated with the probability of skid resistance values in a pavement section fall below the required limit.

ACS Style

Abdullah Azzam; Mohammad Ali Khasawneh; Aslam Ali Al-Omari; Eyad Masad; Emad Kassem. A statistical approach for predicting skid resistance of asphalt pavements. International Journal of Pavement Research and Technology 2020, 14, 647 -654.

AMA Style

Abdullah Azzam, Mohammad Ali Khasawneh, Aslam Ali Al-Omari, Eyad Masad, Emad Kassem. A statistical approach for predicting skid resistance of asphalt pavements. International Journal of Pavement Research and Technology. 2020; 14 (6):647-654.

Chicago/Turabian Style

Abdullah Azzam; Mohammad Ali Khasawneh; Aslam Ali Al-Omari; Eyad Masad; Emad Kassem. 2020. "A statistical approach for predicting skid resistance of asphalt pavements." International Journal of Pavement Research and Technology 14, no. 6: 647-654.

Articles
Published: 27 August 2020 in Road Materials and Pavement Design
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This study aimed to develop, evaluate, and validate a new cyclic cracking assessment test that has advantages over the available monotonic and cyclic cracking assessment tests. Also, it addresses the major concerns related to the implementation of the Balanced Mix Design (BMD) such as long specimen preparation and testing time and the validity of cracking performance assessment tests. The laboratory evaluation findings showed that the proposed test and derived performance indicators were sensitive to the composition of mixes, had variability lower than other cyclic tests, and similar to the one obtained from the monotonic performance indicators. Besides, it correlated well with the observed field cracking performance of sixteen field projects. The derived indicators were able to distinguish between different field cracking performance groups and develop a pass/fail performance cracking assessment threshold.

ACS Style

Hamza Alkuime; Emad Kassem; Fouad M. Bayomy; Richard J. Nielsen. Development of a multi-stage semi-circle bending cyclic test to evaluate the cracking resistance of asphalt mixtures. Road Materials and Pavement Design 2020, 1 -21.

AMA Style

Hamza Alkuime, Emad Kassem, Fouad M. Bayomy, Richard J. Nielsen. Development of a multi-stage semi-circle bending cyclic test to evaluate the cracking resistance of asphalt mixtures. Road Materials and Pavement Design. 2020; ():1-21.

Chicago/Turabian Style

Hamza Alkuime; Emad Kassem; Fouad M. Bayomy; Richard J. Nielsen. 2020. "Development of a multi-stage semi-circle bending cyclic test to evaluate the cracking resistance of asphalt mixtures." Road Materials and Pavement Design , no. : 1-21.

Journal article
Published: 17 July 2020 in Construction and Building Materials
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The main objective of this study was to review and evaluate the current monotonic cracking performance assessment tests and indicators. The testing requirements of various test standards were compared. Also, key publications, concepts, calculation methods, physical meaning, and advantages and disadvantages of various performance indicators were documented. In addition, a comprehensive laboratory evaluation was conducted to examine indicators sensitivity to mix compositions, variability, and statistical grouping as well as mix performance ranking. The results showed that the indirect tension test provided better cracking assessment as compared to semi-circle bending tests. In addition, the Weibull cracking resistance indicator was recommended over other performance indicators.

ACS Style

Hamza Alkuime; Fahmid Tousif; Emad Kassem; Fouad M.S. Bayomy. Review and evaluation of intermediate temperature monotonic cracking performance assessment testing standards and indicators for asphalt mixes. Construction and Building Materials 2020, 263, 120121 .

AMA Style

Hamza Alkuime, Fahmid Tousif, Emad Kassem, Fouad M.S. Bayomy. Review and evaluation of intermediate temperature monotonic cracking performance assessment testing standards and indicators for asphalt mixes. Construction and Building Materials. 2020; 263 ():120121.

Chicago/Turabian Style

Hamza Alkuime; Fahmid Tousif; Emad Kassem; Fouad M.S. Bayomy. 2020. "Review and evaluation of intermediate temperature monotonic cracking performance assessment testing standards and indicators for asphalt mixes." Construction and Building Materials 263, no. : 120121.

Journal article
Published: 27 June 2020 in Transportation Geotechnics
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The subgrade layer often represents the weakest component of a pavement system, and can significantly affect pavement response and performance under loading. Adequate characterization of subgrade properties is critical to the design and construction of long-lasting, economical pavement systems. The Mechanistic-Empirical (M-E) pavement design protocol implemented through AASHTOWare Pavement ME Design requires resilient modulus of the subgrade soil as one of the primary input parameters. However, performing repeated load triaxial tests to establish the resilient modulus properties of soils is a cumbersome task, and is rarely undertaken by state transportation agencies on a regular basis. The Idaho Transportation Department (ITD) has recently invested significant amount of time and resources to facilitate state-wide implementation of M-E pavement design practices. This study was recently undertaken to characterize typical subgrade soils in Idaho. Extensive laboratory characterization of the soils was carried out including repeated load triaxial testing for determining the resilient modulus values. Several different pavement sections were analyzed by using currently used default values and laboratory-established soil properties as subgrade layer inputs during M-E design. Currently used default soil modulus values were found to be significantly higher than laboratory-established values, and therefore, resulted in the design of pavement sections that would fail considerably early into their service lives. The effect of moisture content on subgrade soil properties was also studied, and the importance of restricting soil moisture contents to the dry side of optimum was highlighted.

ACS Style

Jibon; Debakanta Mishra; Emad Kassem. Laboratory characterization of fine-grained soils for Pavement ME Design implementation in Idaho. Transportation Geotechnics 2020, 25, 100395 .

AMA Style

Jibon, Debakanta Mishra, Emad Kassem. Laboratory characterization of fine-grained soils for Pavement ME Design implementation in Idaho. Transportation Geotechnics. 2020; 25 ():100395.

Chicago/Turabian Style

Jibon; Debakanta Mishra; Emad Kassem. 2020. "Laboratory characterization of fine-grained soils for Pavement ME Design implementation in Idaho." Transportation Geotechnics 25, no. : 100395.

Articles
Published: 22 May 2020 in International Journal of Pavement Engineering
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Skid resistance is a key factor in road safety. Surface friction characteristics of roads are dependent on the microtexture and macrotexture of the surface. The decay of skid resistance with time is a function of traffic level and aggregate characteristics. This study developed predictive models for skid resistance of asphalt pavements and seal coat surfaces. The researchers examined the surface friction characteristics of 35 asphalt pavement test sections and 35 seal coat test sections. The skid number was measured using a skid trailer, while the microtexture and macrotexture of the test sections were measured using a dynamic friction tester and a circular texture meter, respectively. The Aggregate Image Measurement System (AIMS) and Micro-Deval test were also used to evaluate the aggregate shape properties and its resistance to polishing and abrasion. The developed skid prediction models express the skid number over time as a function of aggregate gradation, aggregate resistance to abrasion and polishing, and traffic level. The models showed good correlations with skid numbers measured in the field. These models can be used to optimise the mix design to provide adequate level of friction and estimate the skid number of asphalt pavements and seal coat surfaces over time.

ACS Style

SanD Aldagari; Mohammad Al-Assi; Emad Kassem; Arif Chowdhury; Eyad Masad. Development of predictive models for skid resistance of asphalt pavements and seal coat. International Journal of Pavement Engineering 2020, 1 -13.

AMA Style

SanD Aldagari, Mohammad Al-Assi, Emad Kassem, Arif Chowdhury, Eyad Masad. Development of predictive models for skid resistance of asphalt pavements and seal coat. International Journal of Pavement Engineering. 2020; ():1-13.

Chicago/Turabian Style

SanD Aldagari; Mohammad Al-Assi; Emad Kassem; Arif Chowdhury; Eyad Masad. 2020. "Development of predictive models for skid resistance of asphalt pavements and seal coat." International Journal of Pavement Engineering , no. : 1-13.

Article in press
Published: 11 March 2020 in International Journal of Pavement Research and Technology
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This study aimed to advance the implementation of the most promising wheel-tracking rutting assessment tests in the newly proposed Balanced Mixed Design (BMD) (or Performance-Engineered Mix Design method [PEMD]). In order to achieve this goal, the study examined the validity of two rutting assessment tests (i.e. Hamburg Wheel Tracking test [HWTT], and Asphalt Pavement Analyzer [APA] rut test) and three performance indicators (i.e., HWTT rut depth after 15,000 passes [HWTT15000], HWTT rut depth at 20,000 passes [HWTT20000], and APA rut depth after 8,000 cycles [APA8000]). A total number of 33 asphalt mixes including six Laboratory Mixed-Laboratory Compacted (LMLC), 10 Plant Mixed-Laboratory Compacted (PMLC), and 17 field projects were evaluated in this study. The results demonstrated that HWTT and APA rut test rutting performance indicators were sensitive to the variation in binder content and binder PG. Also, APA8000 results had low/moderate variability, while HWTT15000 and HWTT20000 had moderate variability. In addition, HWTT and APA rut test performance indicators were correlated with the observed field rutting of the evaluated field projects. Several pass/fail performance assessment thresholds were proposed including maximum rut depth of 5 mm, 10 mm, and 12.5 mm for APA8000, HWTT15000, HWTT20000, respectively. Also, the results showed that both HWTT and APA rut test provided similar rutting assessment for the evaluated mixes. The study recommended using HWTT over APA rut test since HWTT can be also used to evaluate the resistance to both rutting and moisture damage. Also, the study recommended using HWTT15000 over HWTT20000 as a performance indicator, since it requires less testing time.

ACS Style

Hamza Alkuime; Emad Kassem. Comprehensive evaluation of wheel-tracking rutting performance assessment tests. International Journal of Pavement Research and Technology 2020, 13, 334 -347.

AMA Style

Hamza Alkuime, Emad Kassem. Comprehensive evaluation of wheel-tracking rutting performance assessment tests. International Journal of Pavement Research and Technology. 2020; 13 (3):334-347.

Chicago/Turabian Style

Hamza Alkuime; Emad Kassem. 2020. "Comprehensive evaluation of wheel-tracking rutting performance assessment tests." International Journal of Pavement Research and Technology 13, no. 3: 334-347.

Journal article
Published: 10 July 2019 in Applied Sciences
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Asphalt mixtures are subjected to short-term aging during the production, placement, and compaction processes. Proper evaluation of asphalt pavement performance relies on the accurate characterization of asphalt mixtures during the design stage. In this study, three different loose asphalt mixtures often used in Qatar were evaluated to develop a laboratory short-term aging procedure. Sample mixtures 1 and 3 were collected from a construction site, while mixture 2 was obtained from an asphalt plant. Virgin aggregates and binders were also collected to reproduce the mixtures in the laboratory. Laboratory-produced mixtures were conditioned at 135 °C using various time durations. The mechanical properties of laboratory-produced mixtures were compared to those of mixtures produced on site. The results of the mechanical and binder testing demonstrated that the proper short-term aging protocol for asphalt mixtures often used in road construction in the State of Qatar would involve heating asphalt mixtures for 4 h at 135 °C before laboratory compaction.

ACS Style

Okan Sirin; Dalim K. Paul; Emad Kassem; Ohiduzzaman; Paul. Evaluation of Short-Term Aging Protocol for Asphalt Mixtures. Applied Sciences 2019, 9, 2783 .

AMA Style

Okan Sirin, Dalim K. Paul, Emad Kassem, Ohiduzzaman, Paul. Evaluation of Short-Term Aging Protocol for Asphalt Mixtures. Applied Sciences. 2019; 9 (14):2783.

Chicago/Turabian Style

Okan Sirin; Dalim K. Paul; Emad Kassem; Ohiduzzaman; Paul. 2019. "Evaluation of Short-Term Aging Protocol for Asphalt Mixtures." Applied Sciences 9, no. 14: 2783.

Journal article
Published: 16 October 2018 in Road Materials and Pavement Design
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ACS Style

Okan Sirin; Ohiduzzaman; Emad Kassem; Dalim K. Paul. Comprehensive evaluation of long-term aging of asphalt mixtures in hot climatic condition. Road Materials and Pavement Design 2018, 21, 927 -949.

AMA Style

Okan Sirin, Ohiduzzaman, Emad Kassem, Dalim K. Paul. Comprehensive evaluation of long-term aging of asphalt mixtures in hot climatic condition. Road Materials and Pavement Design. 2018; 21 (4):927-949.

Chicago/Turabian Style

Okan Sirin; Ohiduzzaman; Emad Kassem; Dalim K. Paul. 2018. "Comprehensive evaluation of long-term aging of asphalt mixtures in hot climatic condition." Road Materials and Pavement Design 21, no. 4: 927-949.

Conference paper
Published: 17 September 2018 in MATEC Web of Conferences
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The acoustical performance of asphalt pavements changes with time due to combined effects of environmental conditions and various distresses induced by repeated and heavy traffic. This study examined the changes in the acoustical performance of dense graded asphalt (DGA) pavements over time in the State of Qatar. Tire-pavement noise was measured using on board sound intensity (OBSI) method. The OBSI noise measurements were conducted on DGA pavements with different age and the results were analyzed to evaluate the effect of aging on tire-pavement noise. The results demonstrated that the tire-pavement noise increased with pavement age. The frequency analysis of three road segments showed that at early stage of pavement service life, the noise level is more affected at higher frequency due to the densification and increased air pumping mechanism. At later stage of pavement service life, the noise level is more affected at lower frequency due to the change in pavement surface conditions (e.g., cracking and raveling).

ACS Style

Okan Sirin; Ohiduzzaman; Emad Kassem. Effect of Pavement Surface Aging on Tire-Pavement Noise: A Case Study in the State of Qatar. MATEC Web of Conferences 2018, 203, 05002 .

AMA Style

Okan Sirin, Ohiduzzaman, Emad Kassem. Effect of Pavement Surface Aging on Tire-Pavement Noise: A Case Study in the State of Qatar. MATEC Web of Conferences. 2018; 203 ():05002.

Chicago/Turabian Style

Okan Sirin; Ohiduzzaman; Emad Kassem. 2018. "Effect of Pavement Surface Aging on Tire-Pavement Noise: A Case Study in the State of Qatar." MATEC Web of Conferences 203, no. : 05002.

Journal article
Published: 01 June 2018 in Journal of Transportation Engineering, Part B: Pavements
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This research assesses the influence of temperature variation on GripTester (Findlay Irvine, Penicuik, Scotland) skid resistance measurements of asphalt pavements in Qatar. It evaluated a test road with six different sections and four major highways during winter and summer seasons with ambient temperature ranging from 18 to 44°C. Close-range photogrammetry (CRP) was employed for surface texture analysis using multiple pavement surface images and proprietary software. Differences in binder type and mixture design of the test road sections did not cause significant differences in skid resistance. The south–north (SN) direction of the test road had lower friction values during summer than winter. The opposite was the case for the north–south (NS) direction. The average friction and corresponding texture parameters in the NS direction were respectively 1.4 and 1.2 times higher than in the SN direction. The major highways generally had lower friction in summer than the following winter despite traffic polishing over time. The results suggest that the effect of temperature on skid resistance becomes pronounced when the grip number drops below 0.30 and surface texture decreases.

ACS Style

Reginald B. Kogbara; Eyad A. Masad; Emad Kassem; A. (Tom) Scarpas. Skid Resistance Characteristics of Asphalt Pavements in Hot Climates. Journal of Transportation Engineering, Part B: Pavements 2018, 144, 04018015 .

AMA Style

Reginald B. Kogbara, Eyad A. Masad, Emad Kassem, A. (Tom) Scarpas. Skid Resistance Characteristics of Asphalt Pavements in Hot Climates. Journal of Transportation Engineering, Part B: Pavements. 2018; 144 (2):04018015.

Chicago/Turabian Style

Reginald B. Kogbara; Eyad A. Masad; Emad Kassem; A. (Tom) Scarpas. 2018. "Skid Resistance Characteristics of Asphalt Pavements in Hot Climates." Journal of Transportation Engineering, Part B: Pavements 144, no. 2: 04018015.

Review article
Published: 29 March 2018 in Advances in Civil Engineering
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The detrimental effects of hardening in asphalt pavements were first recognized by pioneering pavement engineers in the 1900s and have been studied extensively during the last 70 years. This hardening process, referred to as asphalt aging, is generally defined as change in the rheological properties of asphalt binders/mixtures due to changes in chemical composition during construction and its service life period. Aging causes the asphalt material to stiffen and embrittle, which affects the durability and leads to a high potential for cracking. This paper presents the state of the art on asphalt and asphalt mixture aging and use of antioxidant additives to retard the aging. A picture of complex molecular structure of asphalt and its changes due to atmospheric condition and various protocols used to simulate aging in laboratory environment are also discussed. Emphasis is given on recent studies on simulation of aging of asphalt mixtures as there has been limited research on mixtures compared to the asphalt binder. Finally, this paper presents the application of antiaging techniques and its mechanism, use of various types of antioxidant additives to retard aging of asphalt and, hence, improve the performance of asphalt pavements.

ACS Style

Okan Sirin; Dalim K. Paul; Emad Kassem. State of the Art Study on Aging of Asphalt Mixtures and Use of Antioxidant Additives. Advances in Civil Engineering 2018, 2018, 1 -18.

AMA Style

Okan Sirin, Dalim K. Paul, Emad Kassem. State of the Art Study on Aging of Asphalt Mixtures and Use of Antioxidant Additives. Advances in Civil Engineering. 2018; 2018 ():1-18.

Chicago/Turabian Style

Okan Sirin; Dalim K. Paul; Emad Kassem. 2018. "State of the Art Study on Aging of Asphalt Mixtures and Use of Antioxidant Additives." Advances in Civil Engineering 2018, no. : 1-18.

Original articles
Published: 13 December 2017 in International Journal of Pavement Engineering
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The rheological properties of asphalt binders change with aging. Aging is accelerated at elevated temperatures due to binder oxidation, leading to fatigue cracking and eventually pavement failure under heavy and repeated traffic loading. This study examined the effect of various antioxidant additives and copolymers with antioxidant agents on retarding the aging of asphalt binders. The performance of antioxidants was evaluated at the binder and mastic levels. Two unmodified binders were tested and fine asphalt mixtures made with these binders and three different aggregates were prepared and evaluated. Fatigue characteristics of asphalt binders and fine portion of asphalt mixtures (FAM) were determined before and after aging and an aging index was defined to evaluate the effect of antioxidants and copolymers on aging. The results showed that certain antioxidants and copolymers such as Redicote AP, Solprene and Calprene may retard the aging and improve the rheological properties of the asphalt binders. In addition, the results of FAM testing confirmed the favourable effect of certain antioxidants on improving the resistance to fatigue. In addition, the type of aggregate was found to influence the rate of aging of asphalt mixtures.

ACS Style

E. Kassem; Mohammad Khan; S. Katukuri; O. Sirin; A. Muftah; F. Bayomy. Retarding aging of asphalt binders using antioxidant additives and copolymers. International Journal of Pavement Engineering 2017, 20, 1154 -1169.

AMA Style

E. Kassem, Mohammad Khan, S. Katukuri, O. Sirin, A. Muftah, F. Bayomy. Retarding aging of asphalt binders using antioxidant additives and copolymers. International Journal of Pavement Engineering. 2017; 20 (10):1154-1169.

Chicago/Turabian Style

E. Kassem; Mohammad Khan; S. Katukuri; O. Sirin; A. Muftah; F. Bayomy. 2017. "Retarding aging of asphalt binders using antioxidant additives and copolymers." International Journal of Pavement Engineering 20, no. 10: 1154-1169.

Conference paper
Published: 10 December 2017 in Sixth International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE 2017
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ACS Style

Emad Kassem; Ohiduzzaman; Okan Sirin. Evaluation of Dynamic Modulus of Asphalt Concrete Field Cores. Sixth International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE 2017 2017, 30 -34.

AMA Style

Emad Kassem, Ohiduzzaman, Okan Sirin. Evaluation of Dynamic Modulus of Asphalt Concrete Field Cores. Sixth International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE 2017. 2017; ():30-34.

Chicago/Turabian Style

Emad Kassem; Ohiduzzaman; Okan Sirin. 2017. "Evaluation of Dynamic Modulus of Asphalt Concrete Field Cores." Sixth International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE 2017 , no. : 30-34.

Journal article
Published: 13 November 2017 in International Journal of Pavement Engineering
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The Poisson’s ratio (PR) of asphalt mixtures is an important input parameter in the constitutive models for pavement design and performance analysis. The design and performance analysis of asphalt pavements depend upon measuring proper material properties such as complex modulus and PR. The PR is often assumed to be time independent or it is calculated as the negative ratio of transverse to axial strains in the time domain under uniaxial loading when the time dependency is considered. This study used accurate methods to calculate the viscoelastic Poisson’s Ratio (VPR) under various loading conditions and demonstrated the error associated with using inaccurate methods for calculating the PR. The results demonstrated that the VPR increased with time in uniaxial unconfined tension and compression tests where shear relaxation was generally faster than dilatational relaxation. While the VPR slightly decreased with time in uniaxial confined compression tests where the dilatational relaxation was faster than the shear relaxation. In addition, the results demonstrated that asphalt mixtures with coarse aggregate gradations had lower VPR compared to asphalt mixtures with finer aggregate gradations. Also, the VPR was found to be sensitive to the ageing and moisture conditions. The VPR decreased with ageing and increased with the level and time of moisture conditioning of the asphalt mixtures. Finally, the error introduced by incorrectly calculating the PR as the negative ratio of transverse to axial strains in the time domain was found to be significant in some cases, while it was insignificant in others.

ACS Style

Nasser Alanazi; Emad Kassem; Zachary Grasley; Fouad Bayomy. Evaluation of viscoelastic Poisson’s ratio of asphalt mixtures. International Journal of Pavement Engineering 2017, 20, 1231 -1238.

AMA Style

Nasser Alanazi, Emad Kassem, Zachary Grasley, Fouad Bayomy. Evaluation of viscoelastic Poisson’s ratio of asphalt mixtures. International Journal of Pavement Engineering. 2017; 20 (10):1231-1238.

Chicago/Turabian Style

Nasser Alanazi; Emad Kassem; Zachary Grasley; Fouad Bayomy. 2017. "Evaluation of viscoelastic Poisson’s ratio of asphalt mixtures." International Journal of Pavement Engineering 20, no. 10: 1231-1238.

Original articles
Published: 23 October 2017 in Road Materials and Pavement Design
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Ageing of asphalt binders has a significant impact on the rheological properties of asphalt binders and thus affects the performance of asphalt pavements. The rate of binder ageing is accelerated at high temperatures. This study presented a case study on the effect of ageing of the asphalt binder properties in the State of Qatar where asphalt mixtures experience harsh environmental conditions of elevated temperatures. The researchers collected field cores from 5-year-old trial pavement sections in Qatar, recovered the binder and tested to evaluate the change in the rheological properties of the binders. Test results indicated that there is a significant effect of ageing on the rheological properties of asphalt binder in Qatar. This effect was more prominent in the wearing course of pavements and diminishes with the increase in pavement depth. Binders along the wheel path experienced less ageing compared to shoulder. Aggregate type and mix design methods were also found to be affecting the extent of ageing of asphalt binder in the field. Furthermore, the researchers found that the current practice of ageing asphalt binders in pressure ageing vessel (PAV) to simulate ageing in the field is not sufficient for the Qatar case. It is recommended to extend the PAV ageing period from the standard 20 h for a hot climate like Qatar and it might go up to about 70 h based on the results of this study.

ACS Style

Okan Sirin; Dalim K. Paul; Emad Kassem; Ohiduzzaman. Effect of ageing on asphalt binders in the State of Qatar: a case study. Road Materials and Pavement Design 2017, 18, 165 -184.

AMA Style

Okan Sirin, Dalim K. Paul, Emad Kassem, Ohiduzzaman. Effect of ageing on asphalt binders in the State of Qatar: a case study. Road Materials and Pavement Design. 2017; 18 (sup4):165-184.

Chicago/Turabian Style

Okan Sirin; Dalim K. Paul; Emad Kassem; Ohiduzzaman. 2017. "Effect of ageing on asphalt binders in the State of Qatar: a case study." Road Materials and Pavement Design 18, no. sup4: 165-184.

Journal article
Published: 07 October 2017 in Applied Sciences
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Tire-pavement friction is a key component in road safety. Adhesion and hysteresis are the two main mechanisms that affect the friction between rubber tires and pavements. This study experimentally examined the relationship between rubber–pavement adhesion and friction. The adhesive bond energy between rubber and pavement surfaces was calculated by measuring the surface energy components of rubber and aggregates. The friction was measured in the laboratory using a dynamic friction tester. The results revealed that there is a fair correlation between the adhesive bond energy and measured coefficient of friction. A rubber–pavement system with higher adhesion provided higher friction at low speed. In addition, the results demonstrated that there is a strong correlation between rubber–pavement friction and rubber properties. Softer rubber provided higher friction and vice versa. The results of this study provide an experimental verification of the relationship between adhesion and pavement surface friction. The adhesive bond energy and rubber rheological properties could be incorporated in computational models to study tire-pavement friction in different conditions (e.g., speed and temperature).

ACS Style

Mohammad Al-Assi; Emad Kassem. Evaluation of Adhesion and Hysteresis Friction of Rubber–Pavement System. Applied Sciences 2017, 7, 1029 .

AMA Style

Mohammad Al-Assi, Emad Kassem. Evaluation of Adhesion and Hysteresis Friction of Rubber–Pavement System. Applied Sciences. 2017; 7 (10):1029.

Chicago/Turabian Style

Mohammad Al-Assi; Emad Kassem. 2017. "Evaluation of Adhesion and Hysteresis Friction of Rubber–Pavement System." Applied Sciences 7, no. 10: 1029.

Journal article
Published: 20 October 2016 in International Journal of Pavement Engineering
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ACS Style

Emad Kassem; Lorena Garcia Cucalon; Eyad Masad; Dallas Little. Effect of warm mix additives on the interfacial bonding characteristics of asphalt binders. International Journal of Pavement Engineering 2016, 19, 1111 -1124.

AMA Style

Emad Kassem, Lorena Garcia Cucalon, Eyad Masad, Dallas Little. Effect of warm mix additives on the interfacial bonding characteristics of asphalt binders. International Journal of Pavement Engineering. 2016; 19 (12):1111-1124.

Chicago/Turabian Style

Emad Kassem; Lorena Garcia Cucalon; Eyad Masad; Dallas Little. 2016. "Effect of warm mix additives on the interfacial bonding characteristics of asphalt binders." International Journal of Pavement Engineering 19, no. 12: 1111-1124.