Papers by Ghazi Al-Khateeb
International Journal of Fatigue, 2014
This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/authorsrights
Emergent materials, Dec 30, 2022
2022 Advances in Science and Engineering Technology International Conferences (ASET), 2022
A problem that emerges from the abundant use of plastic is the disposal of plastic wastes. In thi... more A problem that emerges from the abundant use of plastic is the disposal of plastic wastes. In this paper, Polyethylene Terephthalate (PET) plastic waste from water bottles was utilized to modify asphalt at two different dosages, 2% and 4%. The processed plastic waste was added to a 60/70 penetration grade asphalt binder. The neat and modified asphalt binders were tested for performance grade using the dynamic shear rheometer (DSR). The results provided by the DSR tests were used to simulate the performance of the plastic waste modified asphalt pavement using AASHTOWare Pavement ME Design software. To predict the field performance, two sections were proposed: a thin 3-inch section with light traffic and a thick 6-inch section with heavy traffic, both under Sharjah’s climate conditions. At 90% reliability, AASHTOWare simulation runs showed that the addition of 4% PET plastic increased the bottom-up fatigue resistance by 2.75 years in the 6-inch section. The 3-in pavement did not fail during the 20-year design life for permanent deformation but improved rut resistance. In the 6-inch pavement, the control binder had a service life of 8.92 years. The addition of 2% PET increased the service life due to permanent deformation by 1 year. However, the addition of 4% increased the service life by 8 years. The addition of plastics as an asphalt binder modifier may help solve plastic disposal problems and minimize the negative economic and environmental impact.
IOP Conference Series: Earth and Environmental Science, 2021
This research work focuses on investigating the fatigue and thermal cracking resistance of asphal... more This research work focuses on investigating the fatigue and thermal cracking resistance of asphalt binder with different percentages of styrene-butadiene-styrene (SBS) utilizing rheological testing methods. The laboratory experimental program includes the Dynamic Shear Rheometer (DSR) test at intermediate temperature for fatigue cracking and Bending Beam Rheometer (BBR) at low temperature to assess thermal cracking. The polymer-modified asphalt binders were prepared using four different SBS contents of 2.5, 4.2, 4.8, and 6.1% by asphalt binder weight. The test results were then used to compare the performance of four different SBS modified binders and the control asphalt binder without SBS. The findings showed that the addition of the SBS to asphalt binder improved the fatigue resistance as it was noted that the fatigue parameter (G*.sin δ) was decreasing as the temperature decreases. The BBR results also showed that the addition of SBS enhanced the low-temperature performance by lo...
Sustainable Civil Infrastructures
Case Studies in Construction Materials
Construction and Building Materials, 2022
Serviceability is the ability of a specific section of pavement to serve high speed, high volume,... more Serviceability is the ability of a specific section of pavement to serve high speed, high volume, and mixed traffic in its existing condition. Serviceability is one of the methods to measure pavement behavior or performance at the time. In this study, thirty-five pavement sections (with 1,200 ft length) for urban highways were selected. The data collected included the present serviceability rating (PSR), the slope variance (SV) representing roughness, and physical measurements of pavements distresses including: rutting, fatigue (alligator) cracking, potholes, linear cracking, patching, debonding, potholes, bumps & sags, and depressions. The PSR was determined based on ride quality using a scale from 0 to 5, where 0 represents the poorest rate and 5 is the best rate. It was measured by a panel of five engineers. Each engineer provided the rating independently of the others to avoid bias in PSR. In addition, the PSR was provided by a group of seven drivers (road users) of different types of trucks, buses, and passenger cars. This step was done to validate the results of the fiveengineer panel. A multiple regression experimental model was developed for the present serviceability index (PSI) of flexible pavements for urban highways in Jordan. It was found that potholes provided the most significant variable for computing PSI. Linear cracking and bumps and sags (combined as one variable) provided the second major variable for computing PSI. On the other hand, rut depth had the lowest effect on the variation of PSR.
Jordan Journal of Civil Engineering, 2010
Road safety is a primary concern and goal of highway and traffic engineers worldwide. The road ne... more Road safety is a primary concern and goal of highway and traffic engineers worldwide. The road network in Jordan exhibits relatively high traffic volumes, particularly in urban areas and in the Central Business District (CBD) areas of major cities. Jordan ranks one of the top countries worldwide in terms of having higher numbers of road traffic accidents leading to a relatively high number of fatalities and injuries. In the past few years in particular, the number of registered vehicles in Jordan has considerably increased. As a result, traffic volumes and Vehicle Miles of Travel (VMT) have significantly increased leading to deteriorating traffic flows and escalating traffic congestions and jams. Consequently, the number of road traffic accidents has also noticeably increased in Jordan in the past decade. Complete analysis of statistical data obtained for traffic accidents in Jordan was conducted in this study. Evaluation of the possible leading causes of traffic accidents in Jordan was also carried out. Different possible causes along with behaviors of drivers and pedestrians were investigated and correlated with the number of traffic accidents, fatalities and injuries. Jordan was found to have accident, fatality and injury rates that are considerably higher than those of other countries in the world. Nonetheless, as rates with time, the fatality and injury rates seemed to be moving in the right direction. Yet, the number of traffic accidents, fatalities and injuries looked critical. Traffic accidents and casualties were observed to be higher in summer times. More than 90 percent of traffic accidents, fatalities and injuries occurred on roads with speed limits between 40 and 60 km/h. Pedestrians composed the highest percentage of the total numbers of fatalities and injuries. The majority of driver casualties and passenger casualties (fatalities and injuries) belonged to the age group of 18-42 years. On the other hand, the highest percentage of pedestrian casualties belonged to the age group of 0-18 years. However, about 80 percent of the casualties in Jordan were males and only 20 percent were females. "Tailgating" and "not taking safety measurements during driving" were the most two important driver behaviors in terms of traffic accidents. Yet, behaviors of "using wrong lane" and "not taking safety measurements during driving" led to the highest percentages of the total number of fatalities and injuries. The majority of the pedestrian fatalities and injuries were in fact walking on road during the time of the accident occurrence and about one third of them were walking on sidewalk. Other behaviors of drivers and pedestrians were also important and created traffic complexity and hazardous situations leading to a reduction in saturation flow rates and in capacities and causing bottleneck conditions and traffic jams; hence resulting in traffic safety concerns.
Highway Planning, Survey, and Design, 2020
Highway Planning, Survey, and Design, 2020
Highway Planning, Survey, and Design, 2020
Athens Journal of Τechnology & Engineering, 2015
Polyethylene (PE) is the most common type of plastic. In daily life, plastic bags, plastic bottle... more Polyethylene (PE) is the most common type of plastic. In daily life, plastic bags, plastic bottles, and many other PE products are seen everywhere. Significant amount of plastics are not disposed properly and therefore present as waste material in the environment. Using polyethylene as an additive to asphalt binders may be considered a good way to utilize this material. However, modified asphalt binder properties should be investigated. Rheological properties at higher temperatures of asphalt binders modified with PE are investigated in this study. PE was added to asphalt binder at different percentages by volume of asphalt binder. These percentages were: 3, 4, 5, 6, and 7%. The rheological properties included: the rotational viscosity (RV), asphalt binders complex shear modulus (G*), and the phase angle (δ). It was found that the increase of PE to asphalt binder (PE/A) ratio increased the complex shear modulus (G*) and the rotational viscosity (RV) of asphalt binders. Furthermore, the rutting parameter (G*/sin δ) was improved. However, the PE/A ratio have no significant effect on the phase angle.
Advances in Materials Science and Engineering, 2018
This study intended to evaluate the use of waste stone sawdust filler with asphalt binders and co... more This study intended to evaluate the use of waste stone sawdust filler with asphalt binders and compare the mechanical properties of the waste filler-asphalt mastic with those of the asphalt mastic produced using the typical limestone filler. The mastics were prepared at four filler-to-asphalt ratios by volume of asphalt binder: 0.05, 0.10, 0.20, and 0.30. A dynamic shear rheometer (DSR) strain-controlled frequency sweep test was used to evaluate the properties of the control asphalt binder and the mastics. The test used a constant strain of 10% and loading frequencies of 10, 5.6, 3.1, 1.78, 1.0, 0.56, 0.31, 0.178, and 0.1 Hz and was conducted at wide range of temperatures: 10, 20, 30, 40, 50, 60, and 70°C. The test measured the complex shear modulus (G∗) value and the phase angle for the binder and the mastics. The findings of this study showed that the stone sawdust filler demonstrated higher resistance to fatigue and rutting behavior than the limestone filler. However, the elastic...
Construction and Building Materials, 2017
h i g h l i g h t s A new micromechanical model was developed to predict the asphalt mastic behav... more h i g h l i g h t s A new micromechanical model was developed to predict the asphalt mastic behavior. A power model was found to fit the rheological data of the mastic the best. The model had a high degree of confidence and high coefficient of determination. The new model showed improved predictions compared with available models. The stiffening ratio increased with the increase in temperature and decrease in frequency.
International Journal of Pavement Research and Technology, 2017
This study aims at investigating the effect of restricted zone in Superpave specifications for ag... more This study aims at investigating the effect of restricted zone in Superpave specifications for aggregate gradations on volumetric properties as well as compaction properties of asphalt mixtures. The aggregate specifications in the Superpave system include a restricted zone that lies along the maximum density line and through which gradations are not recommended to pass. Fifteen different gradations of limestone aggregate covering three nominal maximum aggregate sizes (NMAS) of 19.0, 12.5, and 9.5 mm were used in this study. These gradations covered five types: Below Restricted Zone (BRZ), Above Restricted Zone (ARZ), Through Restricted Zone (TRZ), Hump through Restricted Zone (HRZ), and Crossover through Restricted Zone (CRZ). Originally, it was observed that mixtures closely following the 0.45 power maximum density line in the finer gradation had unacceptably low voids in mineral aggregate (VMA). Low VMA values normally lead to less effective asphalt binder content in the asphalt mixture and result in instable mixture. In this study, the effect of these variations with respect to restricted zone avoiding, passing, crossing, or humping on the volumetric properties of mixtures was investigated.
Construction and Building Materials
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Papers by Ghazi Al-Khateeb