Ghassan Chehab | American University of Beirut (original) (raw)

Papers by Ghassan Chehab

Research paper thumbnail of Specimen geometry study for direct tension test based on mechanical tests and air void variation in asphalt concrete specimens compacted by Superpave gyratory compactor : Asphalt Mixtures 2000

Transportation Research Record Journal of the Transportation Research Board, 2000

... Superpave Gyratory Compactor Ghassan R. Chehab, Emily O'Quinn, and Y. Richard Ki... more ... Superpave Gyratory Compactor Ghassan R. Chehab, Emily O'Quinn, and Y. Richard Kim ... According to ASTM D1188-96, asphalt concrete speci-mens have to be covered with Parafilm membrane to make the spec-imen impermeable to water. ...

Research paper thumbnail of Implementing the Mechanistic-Empirical Design Guide Procedure for a Hot-Mix Asphalt-Rehabilitated Pavement in Indiana

Transportation Research Record Journal of the Transportation Research Board, Feb 2, 2015

Page 1. Implementing the Mechanistic–Empirical Design Guide Procedure for a Hot-Mix Asphalt–Rehab... more Page 1. Implementing the Mechanistic–Empirical Design Guide Procedure for a Hot-Mix Asphalt–Rehabilitated Pavement in Indiana Khaled A. Galal and Ghassan R. Chehab 121 Transportation Research Record: Journal of the Transportation Research Board, No. ...

Research paper thumbnail of Recycling construction materials in a developing country: four case studies

International Journal of Engineering Management and Economics, 2012

This study identifies, documents, and assesses the existing levels of awareness and implementatio... more This study identifies, documents, and assesses the existing levels of awareness and implementation of sustainability practices amongst the different participants in the Lebanese construction industry. The analysis is based on a survey of owners, designers, and contractors supplemented with four case studies illustrating the recycling of construction demolition waste (CDW). The results indicate an acceptable level of awareness, but a mediocre level of implementation of sustainable practices which were limited to green design efforts and uncoordinated attempts at recycling construction demolition materials. The study concludes with recommendations on how to 1 further improve awareness regarding sustainable practices amongst the various stakeholders in the Lebanese construction industry 2 overcome some of the obstacles preventing higher recycling rates.

Research paper thumbnail of Use Of Finite Element Method To Predict The Cooling Curves Of Newly Paved Hma And Wma

Qatar Foundation Annual Research Conference, Nov 13, 2014

Research paper thumbnail of Evaluating Recycled Asphalt Pavement Mixtures with Mechanistic-Empirical Pavement Design Guide Level 3 Analysis

Transportation Research Record: Journal of the Transportation Research Board, 2006

The main objective of this study is to assess the sensitivity of the predicted performance of rec... more The main objective of this study is to assess the sensitivity of the predicted performance of recycled asphalt pavement (RAP) mixtures to the assumed binder grade. That is achieved with the Mechanistic–Empirical Pavement Design Guide (MEPDG) software to predict the ...

Research paper thumbnail of Probabilistic Modeling of Dynamic Modulus Master Curves for Hot-Mix Asphalt Mixtures

Transportation Research Record: Journal of the Transportation Research Board, 2015

Research paper thumbnail of Use of creep compliance interconverted from complex modulus for thermal cracking prediction using the M–E pavement design guide

Http Dx Doi Org 10 1080 10298430802621531, Jan 30, 2009

... DOI: 10.1080/10298430802621531 Hao Yin a * , Ghassan R. Chehab a , Shelley M. Stoffels a ... ... more ... DOI: 10.1080/10298430802621531 Hao Yin a * , Ghassan R. Chehab a , Shelley M. Stoffels a ... wherein the prediction of pavement distresses and performance incorporate fundamental properties of AC materials as well as empirical transfer functions (Timm and Newcomb 2003 ...

Research paper thumbnail of Exploratory Analysis of Accelerated Wear Testing to Evaluate Performance of Pavement Markings

Transportation Research Record: Journal of the Transportation Research Board, 2009

... Before testing, baseline Donnell, Chehab, Tang, and Schall 79 ... FIGURE 3 Pavement marking s... more ... Before testing, baseline Donnell, Chehab, Tang, and Schall 79 ... FIGURE 3 Pavement marking strips layout. (Section 1 contains six markings because glass beads were not dispensed on one of the lines as prescribed in the evaluation protocol. ...

Research paper thumbnail of Investigation of Ultra-Rapid-Setting Emulsion for Tack Coat Applications

Transportation Research Record: Journal of the Transportation Research Board, 2012

Research paper thumbnail of Measuring the Complex Modulus of Asphalt Concrete Using Ultrasonic Testing

Journal of Engineering Science and Technology Review

Dynamic modulus mastercurves are essential for the design and modeling of asphalt concrete (AC). ... more Dynamic modulus mastercurves are essential for the design and modeling of asphalt concrete (AC). One way of improving the accuracy of the upper asymptote of the mastercurve is to test at extremely high frequencies or extremely low temperatures. Ultrasound is used extensively in the nondestructive testing of materials and the work completed here demonstrates the potential for the application of this technology to AC. Since testing at extremely low temperatures is not practical, a new ultrasonic technique is developed for measuring the complex moduli of AC. A theoretical explanation of the measurement process is provided. Two AC specimens were tested using the ultrasonic method and the dynamic modulus method in the indirect tensile test (IDT) mode. Both test techniques were performed at four different temperatures. The mastercurves were constructed using time-temperature superposition on the IDT test data and the upper asymptotes were extrapolated. The ultrasonic data was shifted to the desired reference temperature and the predicted moduli were compared to those of the IDT test. It was found that the moduli predicted using the ultrasound measurement agreed well for the specimen with a lower air-void content and differed more for the specimen with a higher air-void content. The phase angles predicted by the ultrasonic method were higher than those obtained from the IDT test. It is believed that this was a result of wave scattering from air-voids and aggregates. Suggestions are made to further increase the accuracy of the technique.

Research paper thumbnail of Characterization of asphalt concrete in uniaxial tension using a viscoelastoplastic model

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

... Corporate Authors: Association of Asphalt Paving Technologists. 400 Selby Avenue, Suite I St ... more ... Corporate Authors: Association of Asphalt Paving Technologists. 400 Selby Avenue, Suite I St Paul, MN 55102 USA. Availability: Association of Asphalt Paving Technologists. 400 Selby Avenue, Suite I St Paul, MN 55102 USA. Find a library where document is available. ...

Research paper thumbnail of Stress dependent master curve construction for dynamic (complex) modulus

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

ABSTRACT

Research paper thumbnail of Development of a simplified fatigue test and analysis procedure using a viscoelastic, continuum damage model

This dissertation presents a methodology by which the material response under any uniaxial tensil... more This dissertation presents a methodology by which the material response under any uniaxial tensile testing condition (type of loading and temperature) can be predicted from the material response obtained from a single testing condition. The methodology makes use of a ...

Research paper thumbnail of The ME Pavement Design Guide: A Case Study on HMA Overlays over Fractured PCC Slabs

The release of the Mechanistic-Empirical Pavement Design Guide (MEPDG) has provided a unique oppo... more The release of the Mechanistic-Empirical Pavement Design Guide (MEPDG) has provided a unique opportunity for Indiana DOT (INDOT) research engineers to evaluate, calibrate, and validate the new M-E design process. To achieve rational design, designers need to gain enough familiarity with the new MEPDG software and knowledge of the incorporated design methodology, design inputs and Levels, and their relationships to key distresses and performance. In the presented research, a design of experiment was developed and numerous software runs were conducted to evaluate the impact and sensitivity of critical design inputs on pavement response and distresses. The Design Level of the inputs was not pre-selected; rather, it varied from one parameter to the other based on the data available and that is currently used for design by INDOT. The results of this study would help determine the extent to which the various design inputs need to be incorporated and further evaluated in INDOT's local calibration and implementation plan. As a byproduct, the performance of the rubblized section used as a reference in the sensitivity analysis is assessed. An example calibration procedure is provided for the rutting distress prediction model using measured data from the HMA rubblized pavement section.

Research paper thumbnail of Time-temperature superposition principle for asphalt concrete with growing damage in tension state

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

It is known that asphalt concrete in its linear viscoelastic range is thermorheologically simple.... more It is known that asphalt concrete in its linear viscoelastic range is thermorheologically simple. This paper presents the experimental/analytical research that demonstrates the validity of the principle of time-temperature superposition even with growing damage and viscoplastic straining by conducting constant crosshead rate tests on specimens that were pulled apart in tension until failure. Direct benefits and applications from this finding include reduction in testing program conditions, development of strength and corresponding strain mastercurves as a function of reduced time, a methodology for the prediction of stress-strain curves for any given crosshead strain test, and simplification of thermorheological analysis of pavement structures.

Research paper thumbnail of Practical application of continuum damage theory to fatigue phenomena in asphalt concrete mixtures

Research paper thumbnail of Evaluation of fiber reinforced bituminous interlayers for pavement preservation

Research paper thumbnail of Direct effects of thermal cracks on pavement roughness

... Worel, Benjamin. Minnesota Department of Transportation. Chehab, Ghassan R. ... Conference: 2... more ... Worel, Benjamin. Minnesota Department of Transportation. Chehab, Ghassan R. ... Conference: 2007 Journal of the Association of Asphalt Paving Technologists: From the Proceedings of the Technical Sessions Location: San Antonio TX Date: 2007-3-11 to 2007-3-14. Availability: ...

Research paper thumbnail of Laboratory study of geogrid reinforcement in Portland cement concrete

Research paper thumbnail of Sensitivity of RAP binder grade on performance predictions in the MEPDG

This paper assesses the sensitivity of assumed binder grade on performance prediction of mixtures... more This paper assesses the sensitivity of assumed binder grade on performance prediction of mixtures containing Reclaimed Asphalt Pavement (RAP). This was achieved by utilizing the Mechanistic-Empirical Design Guide (MEPDG) software to predict the rutting, fatigue, and ...

Research paper thumbnail of Specimen geometry study for direct tension test based on mechanical tests and air void variation in asphalt concrete specimens compacted by Superpave gyratory compactor : Asphalt Mixtures 2000

Transportation Research Record Journal of the Transportation Research Board, 2000

... Superpave Gyratory Compactor Ghassan R. Chehab, Emily O'Quinn, and Y. Richard Ki... more ... Superpave Gyratory Compactor Ghassan R. Chehab, Emily O'Quinn, and Y. Richard Kim ... According to ASTM D1188-96, asphalt concrete speci-mens have to be covered with Parafilm membrane to make the spec-imen impermeable to water. ...

Research paper thumbnail of Implementing the Mechanistic-Empirical Design Guide Procedure for a Hot-Mix Asphalt-Rehabilitated Pavement in Indiana

Transportation Research Record Journal of the Transportation Research Board, Feb 2, 2015

Page 1. Implementing the Mechanistic–Empirical Design Guide Procedure for a Hot-Mix Asphalt–Rehab... more Page 1. Implementing the Mechanistic–Empirical Design Guide Procedure for a Hot-Mix Asphalt–Rehabilitated Pavement in Indiana Khaled A. Galal and Ghassan R. Chehab 121 Transportation Research Record: Journal of the Transportation Research Board, No. ...

Research paper thumbnail of Recycling construction materials in a developing country: four case studies

International Journal of Engineering Management and Economics, 2012

This study identifies, documents, and assesses the existing levels of awareness and implementatio... more This study identifies, documents, and assesses the existing levels of awareness and implementation of sustainability practices amongst the different participants in the Lebanese construction industry. The analysis is based on a survey of owners, designers, and contractors supplemented with four case studies illustrating the recycling of construction demolition waste (CDW). The results indicate an acceptable level of awareness, but a mediocre level of implementation of sustainable practices which were limited to green design efforts and uncoordinated attempts at recycling construction demolition materials. The study concludes with recommendations on how to 1 further improve awareness regarding sustainable practices amongst the various stakeholders in the Lebanese construction industry 2 overcome some of the obstacles preventing higher recycling rates.

Research paper thumbnail of Use Of Finite Element Method To Predict The Cooling Curves Of Newly Paved Hma And Wma

Qatar Foundation Annual Research Conference, Nov 13, 2014

Research paper thumbnail of Evaluating Recycled Asphalt Pavement Mixtures with Mechanistic-Empirical Pavement Design Guide Level 3 Analysis

Transportation Research Record: Journal of the Transportation Research Board, 2006

The main objective of this study is to assess the sensitivity of the predicted performance of rec... more The main objective of this study is to assess the sensitivity of the predicted performance of recycled asphalt pavement (RAP) mixtures to the assumed binder grade. That is achieved with the Mechanistic–Empirical Pavement Design Guide (MEPDG) software to predict the ...

Research paper thumbnail of Probabilistic Modeling of Dynamic Modulus Master Curves for Hot-Mix Asphalt Mixtures

Transportation Research Record: Journal of the Transportation Research Board, 2015

Research paper thumbnail of Use of creep compliance interconverted from complex modulus for thermal cracking prediction using the M–E pavement design guide

Http Dx Doi Org 10 1080 10298430802621531, Jan 30, 2009

... DOI: 10.1080/10298430802621531 Hao Yin a * , Ghassan R. Chehab a , Shelley M. Stoffels a ... ... more ... DOI: 10.1080/10298430802621531 Hao Yin a * , Ghassan R. Chehab a , Shelley M. Stoffels a ... wherein the prediction of pavement distresses and performance incorporate fundamental properties of AC materials as well as empirical transfer functions (Timm and Newcomb 2003 ...

Research paper thumbnail of Exploratory Analysis of Accelerated Wear Testing to Evaluate Performance of Pavement Markings

Transportation Research Record: Journal of the Transportation Research Board, 2009

... Before testing, baseline Donnell, Chehab, Tang, and Schall 79 ... FIGURE 3 Pavement marking s... more ... Before testing, baseline Donnell, Chehab, Tang, and Schall 79 ... FIGURE 3 Pavement marking strips layout. (Section 1 contains six markings because glass beads were not dispensed on one of the lines as prescribed in the evaluation protocol. ...

Research paper thumbnail of Investigation of Ultra-Rapid-Setting Emulsion for Tack Coat Applications

Transportation Research Record: Journal of the Transportation Research Board, 2012

Research paper thumbnail of Measuring the Complex Modulus of Asphalt Concrete Using Ultrasonic Testing

Journal of Engineering Science and Technology Review

Dynamic modulus mastercurves are essential for the design and modeling of asphalt concrete (AC). ... more Dynamic modulus mastercurves are essential for the design and modeling of asphalt concrete (AC). One way of improving the accuracy of the upper asymptote of the mastercurve is to test at extremely high frequencies or extremely low temperatures. Ultrasound is used extensively in the nondestructive testing of materials and the work completed here demonstrates the potential for the application of this technology to AC. Since testing at extremely low temperatures is not practical, a new ultrasonic technique is developed for measuring the complex moduli of AC. A theoretical explanation of the measurement process is provided. Two AC specimens were tested using the ultrasonic method and the dynamic modulus method in the indirect tensile test (IDT) mode. Both test techniques were performed at four different temperatures. The mastercurves were constructed using time-temperature superposition on the IDT test data and the upper asymptotes were extrapolated. The ultrasonic data was shifted to the desired reference temperature and the predicted moduli were compared to those of the IDT test. It was found that the moduli predicted using the ultrasound measurement agreed well for the specimen with a lower air-void content and differed more for the specimen with a higher air-void content. The phase angles predicted by the ultrasonic method were higher than those obtained from the IDT test. It is believed that this was a result of wave scattering from air-voids and aggregates. Suggestions are made to further increase the accuracy of the technique.

Research paper thumbnail of Characterization of asphalt concrete in uniaxial tension using a viscoelastoplastic model

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

... Corporate Authors: Association of Asphalt Paving Technologists. 400 Selby Avenue, Suite I St ... more ... Corporate Authors: Association of Asphalt Paving Technologists. 400 Selby Avenue, Suite I St Paul, MN 55102 USA. Availability: Association of Asphalt Paving Technologists. 400 Selby Avenue, Suite I St Paul, MN 55102 USA. Find a library where document is available. ...

Research paper thumbnail of Stress dependent master curve construction for dynamic (complex) modulus

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

ABSTRACT

Research paper thumbnail of Development of a simplified fatigue test and analysis procedure using a viscoelastic, continuum damage model

This dissertation presents a methodology by which the material response under any uniaxial tensil... more This dissertation presents a methodology by which the material response under any uniaxial tensile testing condition (type of loading and temperature) can be predicted from the material response obtained from a single testing condition. The methodology makes use of a ...

Research paper thumbnail of The ME Pavement Design Guide: A Case Study on HMA Overlays over Fractured PCC Slabs

The release of the Mechanistic-Empirical Pavement Design Guide (MEPDG) has provided a unique oppo... more The release of the Mechanistic-Empirical Pavement Design Guide (MEPDG) has provided a unique opportunity for Indiana DOT (INDOT) research engineers to evaluate, calibrate, and validate the new M-E design process. To achieve rational design, designers need to gain enough familiarity with the new MEPDG software and knowledge of the incorporated design methodology, design inputs and Levels, and their relationships to key distresses and performance. In the presented research, a design of experiment was developed and numerous software runs were conducted to evaluate the impact and sensitivity of critical design inputs on pavement response and distresses. The Design Level of the inputs was not pre-selected; rather, it varied from one parameter to the other based on the data available and that is currently used for design by INDOT. The results of this study would help determine the extent to which the various design inputs need to be incorporated and further evaluated in INDOT's local calibration and implementation plan. As a byproduct, the performance of the rubblized section used as a reference in the sensitivity analysis is assessed. An example calibration procedure is provided for the rutting distress prediction model using measured data from the HMA rubblized pavement section.

Research paper thumbnail of Time-temperature superposition principle for asphalt concrete with growing damage in tension state

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

It is known that asphalt concrete in its linear viscoelastic range is thermorheologically simple.... more It is known that asphalt concrete in its linear viscoelastic range is thermorheologically simple. This paper presents the experimental/analytical research that demonstrates the validity of the principle of time-temperature superposition even with growing damage and viscoplastic straining by conducting constant crosshead rate tests on specimens that were pulled apart in tension until failure. Direct benefits and applications from this finding include reduction in testing program conditions, development of strength and corresponding strain mastercurves as a function of reduced time, a methodology for the prediction of stress-strain curves for any given crosshead strain test, and simplification of thermorheological analysis of pavement structures.

Research paper thumbnail of Practical application of continuum damage theory to fatigue phenomena in asphalt concrete mixtures

Research paper thumbnail of Evaluation of fiber reinforced bituminous interlayers for pavement preservation

Research paper thumbnail of Direct effects of thermal cracks on pavement roughness

... Worel, Benjamin. Minnesota Department of Transportation. Chehab, Ghassan R. ... Conference: 2... more ... Worel, Benjamin. Minnesota Department of Transportation. Chehab, Ghassan R. ... Conference: 2007 Journal of the Association of Asphalt Paving Technologists: From the Proceedings of the Technical Sessions Location: San Antonio TX Date: 2007-3-11 to 2007-3-14. Availability: ...

Research paper thumbnail of Laboratory study of geogrid reinforcement in Portland cement concrete

Research paper thumbnail of Sensitivity of RAP binder grade on performance predictions in the MEPDG

This paper assesses the sensitivity of assumed binder grade on performance prediction of mixtures... more This paper assesses the sensitivity of assumed binder grade on performance prediction of mixtures containing Reclaimed Asphalt Pavement (RAP). This was achieved by utilizing the Mechanistic-Empirical Design Guide (MEPDG) software to predict the rutting, fatigue, and ...