Mohammed Ghazi Ibrahim

Year: 2025

Academic Degree: Master

Supervisor Type: Supervisor

Supervisor State: In Progress

Bachelor Degree in Building and Construction Engineering

Oct 1, 1997 - Jun 27, 2001

Structural Engineering

Higher Diploma degree in Bridges Engineering

Oct 1, 2001 - Jul 20, 2002

Master degree in Highway and Transportation Engineering

Oct 1, 2002 - Jun 5, 2006

Transportation planning and design

PhD in Highway and Transportation Engineering

May 5, 2014 - Mar 20, 2019

Head of Architecture and building techniques engineering Department [Head of Department]

Sep 3, 2023 - Jun 30, 2025

Deputy Dean for Scientific Affairs [Deputy Dean for Scientific Affairs]

Jul 1, 2025 - Present

Deputy Dean for Scientific Affairs [Deputy Dean for Scientific Affairs]

Sep 15, 2021 - Jul 11, 2023

Head of Civil Technique Department [Head of Department]

Nov 5, 2019 - Sep 15, 2021

Head of Civil Technique Department

Utilization of response surface methodology for predicting and optimizing the physical properties of rubberized asphalt modified with nanosilica and waste denim fiber

Aug 1, 2023

Journal Cleaner Engineering and Technology

publisher Case Studies in Construction Materials

DOI https://doi.org/10.1016/j.cscm.2021.e00633

Volume Volume 15

The complicated behavior of modified asphalt binders in the asphalt matrix makes it difficult to predict their consistency, particularly when waste materials and two or more modifiers are present. This research investigated the effect of waste denim fiber (WDF) and/or nanosilica (NS) on the physical characteristics of asphalt modified by sludge tire pyrolysis oil (S-TPO). Response surface methodology (RSM) has also been investigated as a potential method to develop prediction models for the penetration, softening point, and temperature sensitivity of control and modified asphalt binders. According to the experimental work's findings, treated asphalt's consistency greatly improved up to a particular level of WDF and/or NS particle content. In comparison to S-TPO-modified asphalt, all modified asphalt binders with WDF and/or NS displayed reduced penetration and greater softening point and penetration index values. This finding may be the result of the interactions between the modifiers utilized, which improve stiffness and temperature resistance. However, there was a minor decrease in consistency at high concentrations of WDF and NS compared to that at lower concentrations, which might be caused by the particles aggregating at such high concentrations. In contrast to the individual modifiers, which have no significant impacts, the composite WDF/NS has a substantial impact on the consistency of S-TPO-modified asphalt, according to RSM analysis. For all responses, the developed RSM-based predictive models showed a correlation coefficient (R2) of greater than 0.74. This shows that the addition of WDF and/or NS was responsible for at least 74% of the changes in the consistency of S-TPO-modified asphalt. The multi-objective optimization revealed that the optimum contents for the S-TPO-modified asphalt to achieve the desired consistency were 5.1 WDF and 2.6 NS. Overall, it was discovered that RSM is an effective method for accurately predicting the consistency of S-TPO-modified asphalt with WDF and/or NS parti

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Investigating the mechanical properties and durability of asphalt mixture modified with epoxidized natural rubber (ENR) under short and long-term aging conditions

Nov 4, 2022

Journal Polymers

publisher Case Studies in Construction Materials

DOI https://doi.org/10.1016/j.cscm.2021.e00633

Modifiers such as fibers, fillers, natural and synthetic polymer extenders, oxidants and anti-oxidants, and anti-stripping agents are added to produce modified asphalt. However, polymers are the most widely utilized modifiers to enhance the function of asphalt mixtures. The objective of this research was to evaluate the mechanical properties and durability of epoxidized natural rubber (ENR)-modified asphalt mix under short- and long-term aging conditions. The physical and rheological characteristics of the base asphalt and ENR-modified asphalt (ENRMA) were tested. In order to evaluate the mechanical properties and durability of the modified mixtures, the resilient modulus of the ENR–asphalt mixtures under unaged, and short- and long-term aging conditions at various temperatures and frequencies was obtained. Furthermore, the resistance to moisture damage of asphalt mixtures was investigated. The findings showed that the stiffness of the ENR–asphalt mixes increased because of the mutual influence of short- and long-term aging on the mixes. In addition, ENR reduced the susceptibility to moisture damage. The stiffness of the mixes was influenced by the temperature and frequencies. By using mathematical modelling via the multivariable power least squares method, it was found that temperature was the dominant factor among all other factors. The results suggested that the durability of asphalt pavements is improved by using ENR.

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Optimisation of Recoverable Horizontal Deformation and Size Ratio of Compacted Rubberized Stone Mastic Asphalt Based on Rubber and Binder Contents Using Response Surface Methodology

Mar 1, 2022

Journal IOP Conference Series: Earth and Environmental Science

publisher IOP Publishing

DOI 10.1088/1755-1315/999/1/012005

Issue 1

Volume 999

The use of waste materials such as rubber powder in stone mastic asphalt (SMA) has improved the structural performance to some extent, and the research on the improvement is still ongoing. Rubberised stone mastic asphalt has shown good performance in terms of resilient modulus. In this research, response surface methodology was utilised to increase the efficiency in determining the recoverable horizontal deformation and samples compaction level using optimum rubber and binder content. Thirty-one tests were performed on different binders and rubber contents, and the recoverable horizontal deformation and ratio of height to the diameter of Marshall compacted samples were recorded. The ANOVA analysis showed a low P-value with a high correlation coefficient, and the optimisation showed that adding almost 3% rubber powder to SMA could improve the compaction level and desirable recoverable deformation

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Evaluation of measured and predicted resilient modulus of rubberized Stone Mastic Asphalt (SMA) modified with truck tire rubber powder

Dec 1, 2021

publisher Case Studies in Construction Materials

DOI https://doi.org/10.1016/j.cscm.2021.e00633

Volume Volume 15

Rubberized asphalt is known for its elastic deformation recovery and good resilience in response to loads owing to the elastic characteristics of tire rubber powder. There are several methods for the prediction of the stiffness modulus of asphalt mixtures. However, there are limited studies on predicting the stiffness modulus incorporating both wet and dry rubberization methods based on the available methods of Asphalt Institute (AI) and IDOT (Illinois department of transportation). In this research, Stone Mastic Asphalt (SMA) mixtures were modified with truck tire rubber powder (TRP) with two different processes: SMA-WP (SMA mixtures modified in the wet process) and SMA-DP (SMA mixtures modified in the dry process). In both methods, 3%, 6%, and 9% of TRP were used for modification, and the performance of the control and modified mixtures was evaluated under indirect tensile strength (ITS) and indirect tensile stiffness modulus (ITSM) tests. Finally, the results of ITSM were compared to predicted resilient modulus based on the Asphalt Institute (AI) and Illinois Department of Transportation (IDOT). The experiments revealed that SMA-DP mixes have higher ITS than SMA-WP. At the same time, both methods showed a decrease in ITS as TRP content increases. Furthermore, the SMA-WP samples showed a lower phase angle than SMA-DP samples, indicating higher elasticity for the mixtures. In addition, SMA-WP showed lower horizontal deformation than SMA-DP, which helps reduce rutting on the surface layer. Finally, the prediction results showed that the IDOT method could not predict the Stiffness Modulus, while the AI method was more accurate and can be used for prediction

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Improve Recycled Concrete Aggregate properties in Order to Use It in Paving Application as Aggregate

Feb 1, 2021

Journal IOP Conference Series: Materials Science and Engineerin

publisher Case Studies in Construction Materials

DOI 10.1088/1757-899X/1075/1/012033

Issue 1

Volume 1075

The amount of crushed cement concrete continues to increase daily as a result of the demolition of old structures, thereby increasing pollution. To cope with the pressure imposed by the rise in environmental awareness and the stringent disposal regulations set by environmental protection agencies, effective measures for handling and disposing of crushed concrete must be implemented. Instead of simply disposing of crushed concrete, alternative efforts should be considered to utilize it as a recyclable material. The objective of this study was to improve recycled concrete aggregate (RCA) to be able to using it in paving application. Three types of treatments applied to improve RCA properties. In this study three types of treatment were used to improve RCA properties. Theses treatment are soak RCA in HCL acid for 24 hours, grind RCA in Los Angeles Abrasion machine, re-grind RCA particle in jaw crush machine. In order to evaluate each treatment the aggregate properties are determined. All properties were determined for RCA passing and retained sieve size of 5 mm and 1.18 mm respectively. The calculated properties are bulk specific gravity of aggregate, absorption value, abrasion value of aggregate and angularity number of RCA.. The most important conclusions are Soaking RCA in HCL acid has side effect on the specific gravity of aggregate, Putting RCA in Los Angeles Abrasion machine make RCA particles more rounded. Finally, crush RCA in jaw crusher machine for second is best way to improve RCA properties

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Evaluation of Marshall Compactor Effect on the Degradation of Recycled Concrete Aggregate

Dec 19, 2018

Journal Journal of Civil, Construction and Environmental Engineering

DOI 10.1088/1757-899X/1075/1/012033

Issue 5

Volume 3

Demolishing structures presents the problem of disposing of crushed cement and concrete. This form of pollution is a cause for anxiety for environmental awareness agencies, inspiring the creation of more construction and structural policies and regulations that aim to address handling and disposing of crushed concrete. In place of throwing away crushed concrete, it ought to be reused. This study explores the feasibility of reusing crushed concrete in pavement construction applications, by adding it as substitute for aggregate in asphalt mixtures. The study focuses on the physical properties of crushed concrete and its degradation after the compaction of aggregates; in particular, it takes into account its absorption and abrasion qualities. The generally accepted advice is to mix crushed concrete with naturally sourced conventional aggregates. This study evaluated the suitability of variously proportioned and graded mixtures of conventional aggregates and Recycled Concrete Aggregate (RCA); six different proportions (0%, 20%, 40%, 60%, 80% and 100%) and five grades of crushed cement concrete were assessed using a 5 mm aggregate passing sieve and a 1.18 mm retaining sieve. The resulting mixtures were subjected to compaction of 20, 40, 60, 80 or 100 blows, using a Marshall Compactor. The results of the study reveal that the crushed concrete and the mixtures with the recommended ranges of sieve sizes and conventional aggregates are suitable for roads that have a medium volume of traffic.

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Effect of Compaction on the Degradation of Crushed Concrete Used as Partial Aggregate Substitute in Asphalt Mixtures

Jul 25, 2017

Journal Global Civil Engineering Conference

publisher Springer Singapore

The amount of crushed cement concrete continues to grow every day from the demolition of old structures, causing more pollution. Hence, owing to the increase in environmental awareness and stringent regulations governing the disposal, as set by environmental protection agencies, more effective measures for the handling and disposal of crushed concrete must be implemented. Instead of simply disposing of crushed concrete, effective alternative efforts should be considered to utilise it as a reusable material. The objective of this study is to evaluate the possible utilisation of crushed concrete as an aggregate substitute in asphalt mixture for pavement construction applications. However, owing to the poor physical properties of crushed concrete in terms of absorption and abrasion, this study focuses on the degradation that happens in the aggregate after compaction. The recommendation is for crushed concrete to be mixed with conventional aggregates from natural sources. In this study, suitable mixtures of crushed concrete and conventional aggregates were determined based on the combinations of five types of gradation and six different proportions of crushed cement concrete (0, 20, 40, 60, 80 and 100%) from an aggregate passing and retained sieve size of 5 mm and 1.18 mm, respectively. Mixtures of the crushed concrete and conventional aggregates were subjected to compaction of 20, 40, 60, 80 or 100 blows, using a Marshall compactor. Based on the study, the mixtures of the crushed concrete with the recommended ranges of sieve sizes and conventional aggregates are suitable for roads with a medium traffic volume.

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11th International Conference on Road and Airfield Pavement Technology (11th ICPT 2019)

Jul 10, 2019 - Jul 12, 2019

Country Malaysia

Location Malaysia

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Global Civil Engineering Conference

Jul 25, 2017 - Jul 28, 2017

Publisher Springer Singapore.

Country Malaysia

Location Malaysia

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