Mahmoud Enieb

• Doctor of Engineering
• Professor (Full) at Assiut University

Laboratory evaluation of elastomer- and plastomer-modified asphalt binders using different grades of asphalt binders and produced asphalt concrete mixes is the subject of this paper. The evaluated polymer modifiers in this study were an elastomer (commercially available styrene-butadiene-styrene (SBS) and a plastomer (functionally modified olefin c...

In the study, the effect of nano ferric oxide (Fe2O3) modification was investigated to improve the rheolog- ical properties of bitumen and mechanical properties of Hot Mix Asphalt (HMA). Rutting potential and non-recoverable compliance (Jnr) were determined after subjecting modified bitumen to short-term and long-term aging. Multiple Stress Creep R...

This research aims to study the impact of Zycobond and Terrasil (liquid nano-acrylic co-polymer) as additives with cement and hydrated lime for stabilizing highway subgrade silty soil. Laboratory tests were conducted to identify the most suitable rehabilitation technique for subgrade silty soils with high plasticity at optimal moisture levels, and...

Abstract of research submitted for promotion to the position of Professor

Reflective cracking poses a significant challenge to the performance and durability of Hot-Mix Asphalt (HMA) overlays, particularly when applied over deteriorated Joint Plain Concrete (JPC) pavements. This study explores the effects of reflective cracking on overlay pavements through Finite Element Analysis (FEA) using ABAQUS, integrating the Cohes...

Moisture damage has been identified as one of the most common causes of distress in asphalt mixes. The attachment between bitumen aggregate components deteriorates when water interacts at the interface, causing the binder to be stripped from the exterior of the aggregate and cohesive breakdown inside the asphalt binder. To reduce the moisture sensi...

In recent years, the use of waste plastic materials such as low-density polyethylene (LDPE) to modify asphalt binders and enhance mixture performance has garnered significant attention. One major concern with using such materials is the higher production temperature required, which necessitates the use of a bitumen extender agent, such as waste eng...

Climate change and limited power supplies receive significant incentives to develop alternative paving materials and technologies. Reclaimed asphalt pavement (RAP) and Warm Mix Asphalt (WMA) are technologies that can provide significant benefits to both the environment and the economy. This study used response surface methodology (RSM) to analyze t...

The use of reclaimed asphalt pavement (RAP) represents a recycling method with environmental benefits along with cost savings. RAP in new combinations of asphalt mixtures has benefits such as lowering the amount of virgin material, reducing cost and natural resources, and causing less environmental harm. In order to improve the physical and rheolog...

The purpose of this study was to examine the high and low-temperature rheological characteristics of asphalt binders modified with waste plastic (WP) and crumb rubber (CR). In this study, three types of asphalt cement were used: neat binder (VB) obtained from a local refinery, VB+3% WP, and VB+15% CR. Performance grade and other physical properties...

The aim of this study is to implement both experimental and numerical approaches to investigate the permanent deformation in asphalt paving mixtures modified with waste plastic (WP) and crumb rubber (CR). In this study, three types of asphalt cement were used: neat binder (VB) obtained from a local refinery, VB+3% WP, and VB+15% CR. Two aggregate g...

Cost overruns are a common problem in the global construction industry, which affects the development of road construction, particularly in developing countries. Moreover, many risk factors in road construction might result in project cost overruns, particularly during COVID-19. So, the research aimed to look into the new risk variables' severity w...

Top 500 authors in EGYPT in field of Asphalt Pavement by SciVal

Most of the pavement distress in warmer regions is due to rutting and moisture damage. As a result, additives are now required to enhance the properties of asphalt binders and mixtures. The influence of nano titanium dioxide (TiO ) modification on the physical and rheological characteristics of the asphalt binder, as well as the rutting performance...

Evaluating the performance of rejuvenated asphalt mixes is crucial for pavement design and construction, as using a rejuvenator not only boosts recycling and contributes to positive effects on the environment but also increases the sensitivity to rutting and moisture. This study was executed to evaluate the effect of a warm mix asphalt (WMA) antist...

Submitted in partial fulfillment of the requirements for Professor of Highway Engineering

The increase in the cost of virgin materials and the environmental sustainability have contributed to increasing the incentive to use asphalt mixtures containing high percentages of recycled asphalt pavement (RAP). However, the use of high percentage of RAP into virgin asphalt mixture could negatively affect the performance of some properties of as...

Delays are a common problem in the global construction industry, affecting the development of the road construction industry, particularly in developing countries. Where, the construction industry faces a lot of risk factors that can contribute to project delays, particularly during COVID-19. The road projects risk management framework was used to...

Due to the poor cracking performance of aged binders, the use of reclaimed asphalt pavement (RAP) in road pavements is limited. When applying a greater RAP percentage, the use of a rejuvenator is necessary. The re-juvenator's unfavourable softening impact, on the other hand, causes the pavement to be vulnerable to rutting. As a result, RAP binders...

Rejuvenators have been utilized to restore the physical and rheological properties of aged asphalt binders found in the reclaimed asphalt pavement (RAP). Also, the rejuvenators are utilized to enhance the cracking resistance of asphalt containing RAP. In addition, polymers have been efficiently applied to enhance the rutting performance of rejuvena...

It is frequently essential to add rejuvenators to recycled mixtures comprising reclaimed asphalt pavement (RAP) to increase their performance. In this research, CR was desulfurized using WEO to produce a compound rejuvenator. The asphalt mixes containing 100% RAP binder were modified and rejuvenated with 0%, 3%, 6%, 9%, and 12% WEO-CR. The performa...

This paper aims to evaluate the possibility of using nanosilica fume as an economic and a viable alternative to high-cost nanomaterials as a prelude to the large-scale use of nanomaterials in the pavement. Therefore, nanosilica fume (NSF), as an industrial waste material, was employed at low contents (2, 4, 6, and 8%) and high contents (20, 30, 40,...

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There is significant evidence that utilizing polymers improves asphalt cement characteristics, preserve the environment, and increases industrial-economic benefits. Consequently, the use of such modifier in asphalt cements via sustainable technology is strongly encouraged. The major goal of this research is to study the effect of modified asphalt c...

Sb2O3 nanoparticle was selected as it is expected to reduce the aging effect on bitumen, and is a novel material hasn’t studied yet in the literature. Bitumen was modified by antimony trioxide (Sb2O3) nano particle. The rutting performance of Sb2O3 modified bitumen and the performance of Hot Mix Asphalt (HMA) was investigated. Multiple stress creep...

This research focused on predicting the performance of modified asphalt mixtures with high contents of nano-silica fume (NSF) using AASHTOWare Pavement ME Design software, which is the production version of the Mechanistic-Empirical Pavement Design Guide (MEPDG). The NSF was completely mixed with the virgin asphalt using a high-shear mixer at 160 °...

Among the nanomaterials, nanosilica (NS) is widely used in asphalt modification research. However, the high price and limited available quantities of NS interdicts its practical use in pavement construction. This study attempts to find viable alternatives that offer a comparable performance of NS. Raw nanoclay (NC) and nano-silica fume (NSF) are th...

The increase in the amount of reclaimed asphalt pavement (RAP) and environmental concerns for bitumen production have contributed to the use of RAP in road construction and maintenance. The use of higher than 15% of RAP adversely affects the physical and rheological properties of the asphalt binder and the mechanical properties of mixtures. Therefo...

The concept of sustainability is considered essential in the development of the asphalt mixtures industry, due to its economic and environmental benefits. This study attempts to highlight the potential benefits of sustainability using Reclaimed Asphalt Pavement (RAP). It reviews previous studies conducted on RAP to obtain the most important charact...

This research aims to evaluate the mechanical properties of hot asphalt mixtures prepared using modified asphalt binders with various contents of nano-silica fume (NSF). The modification to virgin bitumen is done by shear mixing with NSF at low contents (2, 4, 6, and 8%) and high contents (20, 30, 40, and 50%) with bitumen weight. The homogeneity o...

This research provides a methodology which can be used in the design of metro tunnel projects, which helps the contractors and tunneling engineers to select the suitable metro tunnel system. For improving the efficiency and lower the cost of tunneling projects. The selection of the tunnel system is an iterative process which depends heavily upon th...

Lectures on Asphalt Binder Rheological for Master students, Faculty of Engineering, University of Kufa, Iraq.

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This study is aimed at investigating short- and long-term aged properties of glass fibre (GF)-reinforced asphalt mixtures using indirect tensile strength (ITS) and associated fracture energy, moisture susceptibility, creep compliance, resilient modulus, and indirect tension continuous and discontinuous (IDT) fatigue tests. Also, to portray the infl...

This webinar is the summery of published paper in Journal of Materials in Civil Engineering (ASCE).

Roads extraction from VHR satellite images are very paramount for GIS and map updating. Due to the high resolution of satellite images, there are many obstacles broken roads such as shadow, and vehicles. The present work aims to find the most suitable road extraction approach that can be applied in the Egyptian environment. In this study, two satel...

Although the use of polymeric additives has been widely accepted as a promising strategy to improve broad spectrum of pavement deficiencies, aging-induced mechanisms of polymer-modified asphalt binders and mixtures still have critical aspects that should be studied to a comprehensive extent. The primary objective of this paper is to advance the und...

This study is devoted to understand the mechanisms of mineral fillers in asphalt at the mixture and mastic scales. To do so, the physical properties of asphalt mixtures and mastics were evaluated; in addition, a chemical investigation was presented into the mastic scale for the sake of providing insight into the possible mechanisms between asphalt...

The aim of this study is to address the feasibility of using Nanosilica (NS) in bituminous pavements from the perspective of asphalt binder and corresponding mixture characteristics. In this paper, the characteristics of asphalt binder containing 0%, 2%, 4% and 6% of NS have been investigated in terms of the penetration, softening point, viscosity,...

Over the years, researchers have developed many laboratory methods for conditioning and evaluating the moisture damage of asphalt mixtures. Most of the tests do not fully simulate field conditions and the evaluation criterion does not always predict the long-term susceptibility to moisture damage. This paper aims to present a comprehensive conditio...

Construction of twin tunnels in crowded urban cities compels the designer to select a suitable configuration and the associated railway alignment. Therefore, the estimation of optimum clear distance between tunnels, then vertical and horizontal curves of rails is significant for twin tunnel projects to obtain the optimum design of tunnels, safety a...

The study objective of this paper is analysis of different loads affecting the urban railway tunnel systems to determine the optimum tunnel system (single tunnel or twin tunnel). A case study is The Greater Cairo metro line No. 4, which passes under the River Nile in Egypt land. Analysis of settlement and stresses was carried out using three differ...

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The objective of the study is to investigate the influence of seismic analysis of tunnel systems (single and twin tunnels). The seismic analysis is significant for tunnel projects in urban cities to avoid the collapse of tunnels in this crowded city due to displacements generated as a result of earthquake waves. A case study is The Greater Cairo me...

This study investigates wind analysis which is conducted by manual analysis and computer analysis for airports outside population settlements. The accuracy of used software in computer analysis was checked by comparing their results with the manual procedure. The manual analysis represented by windrose type II while the computer analysis represente...

This study investigates the affects that liquid antistrip (LAS) has on the wettability, surface tension and surface free energy (SFE) of bitumen before and after short-term aging. A PG 58-34 asphalt binder was modified with LAS at concentrations of 0.0%, 0.5%, 2.0%, and 5.0% by mass of bitumen and then subjected to short-term aging. The use of cont...

Many principal distresses that affect asphalt concrete (AC) relate to a phenomenon called moisture damage which can lead to longitudinal cracking, spalling, rutting, shoving, stripping and ravelling. The level of susceptibility of an AC to moisture damage depends on the aggregate and binder properties, volumetric mix properties, environmental facto...

Determination of a runway orientation is a critical task in the planning and design of an airport. Runways usually oriented in the direction of the prevailing winds. The best direction can be decided through proper execution of wind analysis for designated area. In this study, wind analysis is conducted by manual analysis and computer analysis to c...

While the demand for transportation is growing rapidly, many problems are facing planners and traffic operators in urban areas; such as; low performance and efficiency levels of passengers transport system. The strategy for tackling these problems has been for years to consider adding more capacity to the transport supply system, through huge inves...

While the demand for transportation is growing rapidly, many problems are facing planners and traffic operators in urban areas; such as; low performance and efficiency levels of passengers transport system. The strategy for tackling these problems has been for years to consider adding more capacity to the transport supply system, through huge inves...

The present study is concerned with the stability of side slope for the highways lying between two canals, eastern Nag Hamady canal and western side canal at Km(70.8).The canals and highway are located on the right bank of the Nile, and pass through the governorates of Assiut and Sohag. The side slope cracks as well as cracks in the asphalt road us...

The deformation within soils is commonly observed to concentrate in narrow zones called shear bands. In the recent years, the localization of strain in geomaterials has been the subject of extensive research. Localization is a physical phenomenon in which the nearly homogenous deformation of the body is abruptly changed into a highly concentrated d...