Ghazi Al-Khateeb

University of Sharjah | US · Department of Civil and Environmental Engineering

This paper presents a new mechanistic empirical model for predicting dynamic modulus of asphalt paving mixtures at a wider range of temperatures and loading frequencies, which can be shifted into a master curve for characterizing asphalt concrete. Available predictive models seem to be not capable of predicting dynamic modulus of asphalt mixtures a...

This paper presents a new fatigue failure criterion for asphalt paving mixtures that is simple, unique, and distinctive. Bending beam fatigue testing in the controlled strain mode at a 1000-microstrain level and 19C temperature was performed on eleven asphalt mixtures that included unmodified and modified binders. Analysis of fatigue load-deformati...

The primary objective of this full-scale accelerated pavement testing was to evaluate the performance of unmodified and polymer modified asphalt binders and to recommend improved specification tests over existing SUperior PERforming Asphalt PAVEment (Superpave®) binder performance grading methodologies.

A simple quantitative method is presented which is applicable to any type of fatigue testing that uses sinusoidal strain/stress input and which will work for experimentally identifying points of failure due to fatigue damage of any kind of material being tested. The present work utilizes strain-controlled bending beam fatigue test on asphalt mixtur...

The use of non-traditional alternatives in asphalt as substitution to virgin aggregates has been extensively spread in an attempt to shift towards sustainable road construction practices. Municipal Solid Waste Incineration Fly Ash (MSWI-FA) is amid the non-traditional materials that are used as a substitution for raw aggregates in bituminous mixtur...

Over time, roads undergo deterioration caused by various factors such as traffic loads, climate conditions, and material properties. Considering the substantial global investments in road construction, it is crucial to periodically assess and implement maintenance and rehabilitation (M and R) plans to ensure the network’s acceptable level of servic...

Rutting is one of the significant distresses in flexible pavements. Examining the methods to decrease permanent deformation is of considerable importance to provide long service life and safe highways. The main objective of this paper is to undertake a state-of-the-art review to combine the existing work on the permanent deformation of asphalt conc...

Rutting is one of the most important distresses in asphalt concrete pavements. It is typically caused by consolidation or lateral movement of the materials (reorientation of aggregate particles) due to traffic loading in a hot climate. The ability to predict rutting depth in asphalt concrete pavements is an important aspect of pavement design. In t...

The thickness of the asphalt binder’s film surrounding the aggregate particles in Hot-Mix Asphalt (HMA) plays a significant role in the durability of the pavement. This study introduces a new approach for determining the film thickness of the asphalt binder using a reflective digital stereo microscope. Image analysis was performed using the thresho...

Asphalt pavements are subjected to major distresses like fatigue, rutting, and low-temperature cracking due to repeated traffic loading and climatic conditions. The modification of the asphalt binder (a major component of an asphalt paving mixture) using additives helps in minimizing the possibility of pavement distresses. The cement additive was u...

This research proposes a hybrid approach for predicting incident duration that integrates the salient features of both factorial design of experiments (DOE) and machine learning (ML). This study compares DOE with another widely used technique, forward sequential feature selection (FSFS). Moreover, to confirm the effectiveness and robustness of the...

Rutting or Permanent deformation is one of the primary distresses that occur in asphalt pavements. Many researchers showed that about 55 to 80% of rutting occurred in the surface layer of asphalt pavement. Since this layer contains 90–95% aggregates by weight, studying the properties of the aggregate component becomes very crucial. Gradation is one...

The asphalt binder coating aggregate particles in hot-mix asphalt (HMA) is considered the key factor that is responsible for the durability of asphalt mixtures and hence the service life of Asphalt Concrete (AC) layers of asphalt pavements. This portion of the asphalt binder is what so-called the asphalt film in the mixture. Estimating the thicknes...

In the 21st century, United Arab Emirates (UAE) is one of many countries that started focusing on building a sustainable eco-friendly system based on recycling waste materials rather than depositing them into landfills. Rubber generated from tires waste is one of those materials that have been proven to be a beneficial material in several applicati...

Zero shear viscosity (ZSV) is believed to be a good indicator of asphalt binder resistance to permanent deformation. It has widespread use in rutting characterization and is considered a good substitute for vacuum capillary viscosity. In the past many years, a number of test methods have been developed to measure the ZSV of asphalt binders. However...

With climate change and the energy crisis gripping the world, countries are looking for sustainable solutions in every aspect of life. Using by-products and recycled materials in highway construction reduces the costs and the carbon footprint of asphalt production. This study investigates the addition of date seed ash, a common waste in the middle...

Asphalt binder plays an important role in the overall resistance of an asphalt mixture to pavement distresses. The rheological properties should be fully characterized before it is put into field use. Usually, a grading system is employed to evaluate and select the appropriate asphalt binder. The Superpave performance grading (PG) system made the f...

Design of experiments (DOE) is a systematic process that allows the investigator to design a set of experiments and study the effect of each factor on a response variable. This research proposes an application of DOE to maximize the reinforced concrete flat slabs' punching shear strength using macro-synthetic fibers. An experimental program was dev...

The thickness of the asphalt binder’s film surrounding the aggregate particles in Hot-Mix Asphalt (HMA) plays a significant role in the durability of the pavement. This study introduces a new approach for determining the film thickness of the asphalt binder using a reflective digital stereo microscope. Image analysis was performed using the thresho...

In CEN/TS 15324 (2008), the equiviscous temperature (EVT) of an asphalt binder was recognized as a potential rutting indicator. A test method, which consisted of temperature sweep and frequency sweep, was developed to determine the EVT based on the concept of low shear viscosity (LSV). In this study, this test method was firstly evaluated in terms...

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 Bendin...

The multiple stress creep recovery (MSCR) test has been regarded by many as the best available test method to evaluate the high-temperature performance of asphalt binders. However, recent studies have shown that the 9-s recovery time may not allow a full recovery of viscoelastic strain for some modified asphalt binders. In that case, some potential...

Fatigue cracking and low-temperature cracking are two major distresses that occur in asphalt pavements. Fatigue cracking is a load-associated distress caused by the tensile stresses at the bottom/top of the asphalt concrete (AC) layer due to repeated traffic loading. On the other hand, low-temperature cracking occurs when tensile stresses built up...

Fatigue cracking is considered one of the major distresses that occur in asphalt pavements, which can decrease the expected service life of this type of pavements. This study aimed at investigating the effect of aging, strain level, modification and temperature on the fatigue behavior of asphalt binders. To achieve the objectives of this study, a 6...

The multiple stress creep recovery (MSCR) test has been recently accepted to improve the rutting assessment of the Superpave performance grading (PG) system. The non-recoverable creep compliance and the percent recovery are two major parameters obtained from the MSCR test. The non-recoverable creep compliance measured at 3.2 kPa is used as a measur...

Flexible pavements in the UAE are subjected to heavy traffic loading repetitions and severe weather conditions which are the main causes of local pavement deteriorate. Fatigue cracking and rutting are most common deterioration types. One effective solution to mitigate both pavement distresses is to use asphalt modifier technologies to improve the p...

Major distresses such as rutting, fatigue, and thermal cracking are facing asphalt pavement structures due to continuous heavy traffic loading and climate change. The modification of asphalt binders (one of the main components of the asphalt paving mix) has the potential to mitigate distresses through using different additives. Polymer modified asp...

This study focused on characterizing the shear-thinning behavior of asphalt binders. The first objective was to identify the existence of yield stress behavior and to employ a rheological model to describe the flow curve of asphalt binders. The second objective was to verify the applicability of the Cox-Merz rule to asphalt binders with considerati...

Highway Lighting (HL) is designed and implemented on the transportation system for expected societal, safety and security reasons. The use of Technologies such as LED lighting and the solar power can encourage many transportation agencies to implement the Highway Lighting on their roads, especially on the rural roads where there are difficulties to...

Highway Lighting (HL) is designed and implemented on the transportation system for expected societal, safety and security reasons. The use of Technologies such as LED lighting and the solar power can encourage many transportation agencies to implement the Highway Lighting on their roads, especially on the rural roads where there are difficulties to...

As the construction industry drives towards sustainability, all construction sectors, including the asphalt pavement, are suggested to explore more environmental approaches in their developments. Despite that the demand for oil is continuously increasing, the production of the worldwide oil is started to diminish due to the depletion of the resourc...

The master curve of a viscoelastic variable is of significance due to its capability of characterizing the linear viscoelastic (LVE) property in an extended time or frequency range. However, the master curves constructed using the traditional approach fail to strictly comply with the LVE theory, leading to inaccurate predictions in the extended ran...

Pavement serviceability index (PSI) is one of the pavement performance measures that have been originally used in the AASHO (currently AASHTO) road test to evaluate the pavement condition. The PSI is highly correlated to roughness index which is currently used in the Mechanistic-Empirical Pavement Design Method to predict pavement performance. Ther...

In this research, Styrofoam in its waste form was first collected, disintegrated, washed and then dried prior to mixing it with asphalt. A 70-80-penetration grade asphalt binder was used and mixed with the processed waste Styrofoam. Mixing percentages of Styrofoam to asphalt (S/A) were: 0.0 % (control sample), 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, an...

Preventive maintenance is the most cost-effective way to extend the pavement service life by retarding the future pavement deterioration. This study presents an overview of preventive maintenance of asphalt pavements regarding the selection of appropriate preventive maintenance treatment and determination of right maintenance time. As part of the S...

This study aims at studying the effect of fillers of waste materials passing sieve # 200 on the rheological properties of asphalt binders used for paving construction. Filler-asphalt mastics were prepared using three mineral fillers of three waste materials: glass, stone sawdust, and medical ash and a fourth filler from the virgin limestone aggrega...

This study aimed at using waste glass to improve shear properties of asphalt binders. Asphalt-glass mastics were prepared at four glass/asphalt (G/A) ratios: 0.05, 0.10, 0.20, and 0.30 by volume of asphalt. The Superpave dynamic shear rheometer (DSR) was used to measure the complex shear modulus value (|G*|) and phase angle (δ) for the control asph...

https://www.hindawi.com/journals/amse/si/534020/

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, an...

This study aims at investigating the influence of laboratory aging on the fatigue performance of asphalt mixtures prepared using the superpave method. In this study, one type of asphalt binder (PG64-10) and one type of aggregate (limestone) were used. Loose mixtures were short-term aged (STA) in a draft oven at 135C for 2 hours, 3 hours and 4 hour...

The Superpave aggregate criteria originally include a restricted zone that lies along the maximum density line and through which gradations are not recommended to pass. The debate with regard to whether or not such a restriction needs to be imposed has been ongoing and inconclusive. In this study, fifteen different gradations of limestone aggregate...

The durability of asphalt mixtures and hence the service life of asphalt pavement surface layers depends to a large extent on the asphalt film thickness. The current Superpave Voids in Mineral Aggregate (VMA) criterion relates mixture durability with VMA. The need to modify the Superpave criterion was supported by a previous study [1]. As the Super...

This study presented a new simplified micromechanical model that describes the asphalt mastic behavior at intermediate and high temperatures. Asphalt mastics were prepared using four fillers: glass, limestone, stone sawdust, and medical ash and one asphalt binder with a penetration grade of 60/70 (PG 64-10). The mastics were prepared at four volume...