Dr. Mahmoud Enieb
Assiut University, Civil Engineering, Faculty Member
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- Dr. Enieb is Associate Professor and Director of the Roads and Airport Laboratory in the Department of Civil Engineer... moreDr. Enieb is Associate Professor and Director of the Roads and Airport Laboratory in the Department of Civil Engineering, Assiut university, Egypt. He has been an active Associate Professor and his teaching interests include pavement materials and design, highway geometric design, traffic safety, traffic flow and controls. His research group currently consists of three postgraduate students under his supervision and in collaboration with different researchers from Egypt, Turkey, Iraq, Malaysia, Libya, and India. Dr. Enieb has multiple research interests in nanomaterials, modeling, advanced testing and instrumentation of asphalt materials, chemical and rheological properties of asphalt binder, asphalt pavement technologies and sustainability, and traffic safety.edit
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... more
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) antistripping agent, namely nano-ZycoTherm, on the moisture-induced damage and rutting potential of asphalt mixtures containing 30% and 60% aged (RAP) binder and rejuvenated with 12% waste engine oil (WEO). For this purpose, the rutting resistance of asphalt mixes in wet and dry conditions was examined utilizing a loaded wheel tracker. In addition, the impacts of moisture on the performance of the mixtures were evaluated using different experiments, such as modified Lottman (AASHTO T283), resilient modulus, dynamic creep, aggregate coating and wheel tracking tests. Fourier transform infrared (FTIR) spectroscopy and thermogravimetric (TG) analysi...
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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... more
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 identify potential risk categories that could impede the success of road construction in Egypt. On the other hand, road construction in Egypt faces numerous challenges with increasing unexpected parameters throughout the project life cycle. In other words, unanticipated risk factors have a significant impact on the success of project execution. As a result, the study’s primary goals are to investigate the majority of the risk factors that cause road construction delays in Egypt. The impact of numerous risk factors has changed the delays in road projects as the COVID-19 pandemic spread across the world. As a result, the study incorporates p...
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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... more
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. Therefore, the use of bitumen and asphalt mixture improver were necessary to reduce the negative effects generated with the use of RAP. This paper aims to study the effect of fiberglass (FG) (0.5%, 1.0%, 1.5%, and 2%) on the mechanical properties of asphalt concrete containing 25%, 50% RAP and 9% waste engine oil. The performance of RAP asphalt mixtures incorporated with FG was evaluated using the Marshall stability test, moisture susceptibility test, and immersion wheel rutting test. The results indicated that the use of FG and RAP materials to rejuvenated asphalt mixtures resulted in an increase in the values of Marshall stability and rutting r...
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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... more
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, and 50%) by asphalt weight as modifying additives to asphalt binder. The chemically prepared nanosilica (NS), as a high-cost nanomaterial, was employed at the contents of 2, 4, and 6% by asphalt weight for comparison purposes. Transmission electronic microscopy was used for scanning the nanostructure particles, and scanning electron microscopy was utilized to assess the homogeneity of modified binders. Changes in the chemical bonds of the modified asphalts were investigated using Fourier transform infrared spectroscopy. The modified binder's physical–rheological properties, temperature susceptibility, aging effect, and economic benefit were investigated. Prediction models were utilized to estimate the rutting parameter ( G */sin δ ) for the modified asphalts. The results revealed that significant improvements in physical–rheological properties, temperature susceptibility, and rutting resistance of the modified asphalt with high contents of NSF were attained. It was found that the NSF additive significantly decreased the short aging acceleration compared to NS. Predictive equations with high correlation have been inferred to correlate NSF content with both the rutting parameter and the rotational viscosity of the modified asphalt, thus enabling the designer to select the appropriate NSF content to achieve specified binder characteristics in the mix to serve pavement performance conditions.
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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... more
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 characteristics in how to use the optimal content of RAP and its effect on some basic properties such as resilient modulus, susceptibility to moisture, permanent deformation, and fatigue. This study mainly focuses on the advantages of using RAP materials in hot mix asphalt (HMA). The results indicated that adding 30% of RAP to virgin asphalt mixtures gives the best performance in terms of the most studied characteristics.
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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... more
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 satellite images from WorldView-2 and WorldView-3 were used. Classification of image by pixel-based and object-based was carried out to find the appropriate classification method for road extraction. Then, road class refinement by morphology and angular texture signature are performed to decrease the misclassifications between roads and other spectrally similar objects. After that, an iterative and localized Hough transform method was compared with the thinning algorithm method to find the proper method that can extract road centerline segments from the refined images. The performance of the extracted roads was estimated by using the common met...
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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... more
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 of the modified asphalts was assessed using Scanning Electron Microscopy. The rotational viscosity, softening point, and penetration tests were used to evaluate the rheological-physical properties of the modified asphalt binders. The stiffness, moisture damage, rutting, and fatigue of the hot mixes prepared with NSF-modified binders were evaluated using Marshall, indirect tensile strength, and double punching tests. The results showed a significant improvement in the rheological-physical properties of the modified binders with high content compared 379 Aboelmagd et al., Evaluation of Hot Mix Asphalt and Binder Performance Modified with ... ...
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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... more
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 and passenger comfort. A case study is the Greater Cairo metro line No. 4, Phase 1. The configuration of twin tunnels includes vertical, horizontal and diagonal alignment. Two cases for diagonal alignment, one of them tunnels pass under the River Nile. Also, two cases for horizontal alignment, one of them tunnels running above bottom clayey soil. Proper clear distance between twin tunnels has been identified according to internal forces and displacement in tunnels. Vertical and horizontal displacements have been presented for twin tunnels and for the surrounding soil. Moreover, induced internal forces in tunnel lining have been computed. Tw...
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ABSTRACT
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ABSTRACT 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... more
ABSTRACT 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 and passenger comfort. A case study is the Greater Cairo metro line No. 4, Phase 1. The configuration of twin tunnels includes vertical, horizontal and diagonal alignment. Two cases for diagonal alignment, one of them tunnels pass under the River Nile. Also, two cases for horizontal alignment, one of them tunnels running above bottom clayey soil. Proper clear distance between twin tunnels has been identified according to internal forces and displacement in tunnels. Vertical and horizontal displacements have been presented for twin tunnels and for the surrounding soil. Moreover, induced internal forces in tunnel lining have been computed. Two-dimensional numerical models are employed by using PLAXIS program to perform the analysis. Also, the procedures of construction of the twin tunnels have been discussed. Based on the calculated result, the clear distance between tunnels has a major effect on soil movement and internal forces in tunnel lining. It shows that the construction procedure affects the soil displacement and internal forces. Construction of the bottom tunnel at first reduces bending moment in top tunnel lining and results in small changes in bending moment in the bottom tunnel lining after the construction of top tunnel. On the other hand, the results have also shown the influence of twin tunnel configuration on railway track alignment.