Prof. Dr. Ahmed A. Ahmed
Civil Engineering Department, Mustansiriyah University, Baghdad, Baghdād, Iraq
'%3e%3cpath%20d='M22.1642%2019.0924C21.7317%2018.068%2021.1041%2017.1375%2020.3163%2016.3527C19.5309%2015.5656%2018.6006%2014.9381%2017.5766%2014.5048C17.5674%2014.5002%2017.5582%2014.4979%2017.5491%2014.4933C18.9774%2013.4616%2019.9059%2011.7811%2019.9059%209.88504C19.9059%206.74408%2017.3611%204.19922%2014.2201%204.19922C11.0792%204.19922%208.53429%206.74408%208.53429%209.88504C8.53429%2011.7811%209.46282%2013.4616%2010.8912%2014.4956C10.882%2014.5002%2010.8728%2014.5025%2010.8636%2014.5071C9.83652%2014.9404%208.91487%2015.5617%208.1239%2016.355C7.33685%2017.1404%206.70933%2018.0707%206.276%2019.0947C5.85031%2020.0972%205.62072%2021.172%205.59967%2022.2609C5.59905%2022.2853%205.60335%2022.3097%205.61229%2022.3325C5.62123%2022.3553%205.63465%2022.376%205.65174%2022.3935C5.66883%2022.4111%205.68926%2022.425%205.71182%2022.4345C5.73437%2022.444%205.7586%2022.4489%205.78308%2022.4489H7.15868C7.25956%2022.4489%207.3398%2022.3686%207.3421%2022.2701C7.38795%2020.5001%208.09868%2018.8425%209.35506%2017.5861C10.655%2016.2862%2012.3814%2015.5709%2014.2201%2015.5709C16.0588%2015.5709%2017.7852%2016.2862%2019.0852%2017.5861C20.3415%2018.8425%2021.0523%2020.5001%2021.0981%2022.2701C21.1004%2022.3709%2021.1807%2022.4489%2021.2815%2022.4489H22.6571C22.6816%2022.4489%2022.7058%2022.444%2022.7284%2022.4345C22.751%2022.425%2022.7714%2022.4111%2022.7885%2022.3935C22.8056%2022.376%2022.819%2022.3553%2022.8279%2022.3325C22.8369%2022.3097%2022.8412%2022.2853%2022.8406%2022.2609C22.8176%2021.165%2022.5907%2020.0989%2022.1642%2019.0924ZM14.2201%2013.8284C13.1678%2013.8284%2012.1773%2013.418%2011.4322%2012.6729C10.6871%2011.9278%2010.2767%2010.9374%2010.2767%209.88504C10.2767%208.83271%2010.6871%207.84227%2011.4322%207.09715C12.1773%206.35204%2013.1678%205.94165%2014.2201%205.94165C15.2724%205.94165%2016.2629%206.35204%2017.008%207.09715C17.7531%207.84227%2018.1635%208.83271%2018.1635%209.88504C18.1635%2010.9374%2017.7531%2011.9278%2017.008%2012.6729C16.2629%2013.418%2015.2724%2013.8284%2014.2201%2013.8284Z'%20fill='%238590A2'/%3e%3c/g%3e%3c/svg%3e)
Co-authors
Following
Followers
Research Focus & Metrics
Explore full metrics on Scilit
Academic Career Length
16Years (2011-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications24 August 2022 in Construction and Building Materials
Journal Article
Ahmed A. AhmedMSMahmoud Shakouri
Mahmoud Shakouri
DTDavid Trejo
David Trejo
NVNaga Pavan Vaddey
Naga Pavan Vaddey
1 August 2023 in Journal of Materials in Civil Engineering
Journal Article
MSMahmoud Shakouri
Mahmoud Shakouri
Ahmed A. AhmedMTMohammad Teymouri
Mohammad Teymouri
DTDavid Trejo
David Trejo
8 December 2023 in Construction and Building Materials
Journal Article
Journal Article
Graphene nanoplatelet aggregates (GNAs) are a low-cost, low-quality alternative to graphene nanoplatelets (GNPs), characterized by their three-dimensional stacked structure and porous surface morphology. Despite their affordability, limited research has been conducted on the effects of GNAs in cementitious systems. This study investigates the impact of GNAs on hydration kinetics, phase assemblage, mortar consistency, mechanical strength, bulk electrical resistivity, water absorption, and pore solution pH. Mortar mixtures with 0%, 0.05%, and 1% GNAs by cement weight were prepared using a water-to-cement ratio of 0.42 and cured for 28 days. The results showed that GNAs had minimal influence on hydration kinetics, with no significant changes in hydration products detected by XRD and TGA analyses. Mortar consistency consistently decreased with increasing GNA content. At 0.05%, GNAs had no significant effect on compressive strength or bulk electrical resistivity, whereas 1% GNAs reduced compressive strength by 10%. Water absorption was significantly lower in specimens with 1% GNAs as well, while pore solution pH increased at this dosage. The findings of this study indicate that the incorporation of GNAs at a 0.05% replacement level does not inherently enhance cementitious properties but can influence specific behaviors, such as workability and water absorption, when used at 1% dosages.
26 April 2021 in Sustainable and Resilient Infrastructure
Journal Article
Ahmed A. AhmedNVNaga Pavan Vaddey
Naga Pavan VaddeyChloride concentrations are often evaluated for concrete mixtures used in new construction for quantity control purposes. This paper reports on the reliability of results from ASTM C1152 (acid-soluble) and ASTM C1218 (water-soluble) tests commonly adopted for measuring chlorides in concrete. The effects of cementitious material type, water-binder ratio, admixed chloride level, and degree of carbonation on chloride concentrations of cementitious systems are evaluated. Results show that the release of bound chlorides due to carbonation could be represented by an increase in ASTM C1218 test value. Chloride concentrations measured using ASTM C1152 testing could be significantly lower than the actual chloride concentration for carbonated systems. This underestimation, as a percent of total chloride concentration, could be as high as 40% depending on the cementitious material type and chloride admixed level. Preliminary results indicate that ASTM C1218 could be more reliable when compared to ASTM C1152 for systems with admixed chlorides.
8 August 2024 in E3S Web of Conferences
Conference Paper
AJAqeel Raheem Jabur
Aqeel Raheem Jabur
Ahmed A. AhmedAAAhmed S.D. Al-Ridha
Ahmed S.D. Al-RidhaThe current study examines the impact of using Chopped-Carbon-Fiber (CCF) on the density and compressive strength properties of pure gypsum. Four distinct combinations of pure gypsum were used. The combinations are categorized into two groups based on their water-to-pure gypsum ratio of 0.55 and 0.75. Each group set is separated into two groups based on the volume fraction (Vf) of 0.0% and 0.35% of CCF (Fibrous and Non-Fibrous pure gypsum). Three samples measuring 50 * 50 * 50 mm were used for each admixture. The use of CCF in pure gypsum mixtures has been shown to boost and improve compressive strength for two water-to-pure gypsum ratios (W/PG). The rate at which compressive strength improves with the application of CCF is directly proportional to the ratio of W/PG. In addition, it should be noted that an increase in the W/PG ratio leads to a decrease in both density and compressive strength. Conversely, the behavior of the fibrous pure gypsum reduce drop rate of decline in both density and compressive strength..
About Me
Dr. Ahmed is an Associate Professor in the Department of Civil Engineering at Mustansiriyah University. A dedicated researcher in civil and construction engineering, he has built a strong international academic profile focused on infrastructure resilience and sustainability. Dr. Ahmed earned his Ph.D. in Civil Engineering from Oregon State University in the United States, where he specialized in concrete technology and sustainable infrastructure materials. His doctoral training heavily influenced his subsequent academic contributions, which bridge the gap between material microstructures and field-scale civil applications. His core research focuses on optimizing the mechanical, thermal, and durability properties of cementitious systems. Utilizing advanced microstructural analysis, Dr. Ahmed explores the performance of complex materials and investigates innovative testing protocols. His notable research contributions include assessing water-soluble and acid-soluble chloride testing methodologies in concrete to address critical infrastructure challenges like reinforcement corrosion. As an active member of the professional engineering community, Dr. Ahmed contributes to global industry standards through his associate membership in several American Concrete Institute (ACI) committees and his membership in the American Society of Civil Engineers (ASCE). His career reflects a commitment to developing practical, scalable, and resilient solutions for the modern built environment.
Social Links
