Article
Engineering, Geological
Hideo Komine
Summary: This study investigated the influence of artificial seawater on the hydraulic conductivities of different types of bentonite, revealing that sodium-type bentonites are minimally affected. The author proposed a mechanism for bentonite behavior in artificial seawater, clarifying the validity of cation filtration of montmorillonite mineral layers.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Engineering, Environmental
Hajar Share Isfahani, Amin Azhari
Summary: The research investigated the effects of different percentages of basalt fiber on the shielding performance of bentonite clay, showing that a 2% basalt fiber mixture improved the shielding effectiveness. This mixture could potentially be a new candidate for the disposal of low-level radioactive waste due to its improved performance in radiation shielding.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Environmental Sciences
L. Montes, E. Pavon, A. Cota, Alba
Summary: The study evaluated the influence of clay minerals on the retention of Zr(IV) in nuclear waste, and found three immobilization mechanisms including cation exchange, precipitation/crystallization, and chemical interaction. This is of significant importance for waste management and environmental risk control.
Article
Environmental Sciences
Esperanza Pavon, Maria D. Alba
Summary: This study aims to predict the immobilization behavior of zirconium by clay minerals and investigate the influence of factors such as zirconium cation nature, temperature, time, and pH on the immobilization process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Geochemistry & Geophysics
M. Carme Chaparro, Nicolas Finck, Volker Metz, Horst Geckeis
Summary: The geological disposal in deep bedrock repositories is the preferred option for high-level radioactive waste management, with carbon steel and bentonites considered as potential container and backfill materials. Research indicates that iron is sorbed at the montmorillonite surface via cation exchange in the short-term and consumed by formation of secondary phases in the long-term. The numerical model predicts that Fe-silicate minerals are the main corrosion products in the long-term.
Article
Chemistry, Multidisciplinary
Ivan Morozov, Sergey Zakusin, Pavel Kozlov, Olga Zakusina, Marat Roshchin, Michail Chernov, Kirill Boldyrev, Tatiana Zaitseva, Ekaterina Tyupina, Victoria Krupskaya
Summary: This study demonstrates the high stability of bentonite from the 10th Khutor deposit under elevated temperatures and alkaline conditions, which is crucial for ensuring the safety of radioactive waste disposal.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Teng Teng, Yuming Wang, Xiaoyan Zhu, Xiangyang Zhang, Sihai Yi, Guowei Fan, Bin Liu
Summary: Nuclear power has rapidly developed, but the storage of nuclear waste remains a difficult issue. This study proposed a coupled heat-solid-gas model for simulation analysis, revealing that nuclear waste storage initially heats up the surrounding coal seam before being heated by the far-field reservoir.
Article
Energy & Fuels
Jan Verstricht, Xiang Ling Li, Didier Leonard, Maarten Van Geet
Summary: Monitoring plays a crucial role in the geological disposal of radioactive waste, and HADES URL in Belgium has accumulated valuable experience and sensor data. By assessing the performance of different sensor types, the reliability of monitoring can be improved.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Jiang-Feng Liu, Xu-Lou Cao, Hong-Yang Ni, Kai Zhang, Zhi-Xiao Ma, Li-Ke Ma, Hai Pu
Summary: The study indicates that gas pressure significantly affects the sealing ability of compacted bentonite, with higher gas pressure leading to water expulsion and decreased water saturation degree. Gas breakthrough occurs at 4 MPa, highlighting the sensitivity of water saturation degree in samples to gas pressure.
Review
Nuclear Science & Technology
Lotanna Ohazuruike, Kyung Jae Lee
Summary: This study aims to provide a comprehensive review on the illitization process of bentonite, covering basic clay mineralogy, smectite expansion, mechanisms and observation of illitization, and illitization in Engineered Barrier Systems (EBS). Understanding of smectite illitization is crucial for securing the safety and integrity of nuclear waste disposal systems using bentonite buffer. This thorough review study is expected to provide essential and concise information for the preventive EBS design.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
K. A. Daniels, J. F. Harrington, P. Sellin, S. Norris
Summary: Bentonites are commonly proposed for use in the geological disposal of high heat generating radioactive wastes. This study examined the effect of elevated temperature on the development of swelling and swelling pressure of sodium-activated MX80 bentonite samples, finding that even under extreme conditions, the bentonite was able to swell and completely fill void spaces. Heating the bentonite reduced test duration by about 60%, likely due to a reduction in the viscosity of the test permeant at higher temperatures.
APPLIED CLAY SCIENCE
(2021)
Article
Engineering, Geological
Daichi Ito, Hailong Wang, Hideo Komine
Summary: Both the design and safety assessment of radioactive waste disposal facilities require an accurate evaluation of the hydraulic conductivity of compacted bentonite. This study developed a hydraulic conductivity test system using 2-mm-thick specimens and demonstrated its accuracy and reduced test period compared to traditional methods.
SOILS AND FOUNDATIONS
(2022)
Article
Engineering, Geological
Tian Chen, Majid Sedighi, Andrey P. Jivkov, Suresh C. Seetharam
Summary: The study focused on the hydraulic behavior and conductivity of compacted smectite, proposing a predictive model based on experimental data and microstructure evolution, which shows close agreement with the experimental results.
Article
Engineering, Environmental
Abbas Salati, Hajar Share Isfahani, Mohammad Ali Roshanzamir, Amin Azhari
Summary: The study investigates the radiation shielding performance of bentonite clay with hematite powder as an additive. The experiment reveals that as the percentage of hematite powder increases, the attenuation coefficient grows linearly, while the hydraulic permeability also increases. The bentonite with 45% hematite powder shows the best improvement in gamma-ray radiation shielding and a decrease in TVL and HVL values.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Environmental Sciences
Nicole A. DiBlasi, Ezgi Yalcintas, Floyd E. Stanley, Donald T. Reed, Amy E. Hixon
Summary: The study indicates that EDTA can affect the distribution of plutonium oxidation states, and time, pH, and ligand-to-metal ratio also play a role. EDTA mainly stabilizes the Pu(IV) oxidation state, but Pu(V)-EDTA may persist under environmentally-relevant conditions.
Article
Construction & Building Technology
Sayyed Mehran Khoshoei, Hamid Mortazavi Bak, Sayyed Mahdi Abtahi, Sayyed Mahdi Hejazi, Babak Shahbodagh
Summary: This study experimentally investigated the cyclic behavior of steel slag ballast materials mixed with tire-derived aggregate (TDA), and found that the optimal percentage of TDA in the mixture is 10% by weight (16.5% by volume). The behavior of the ballast was affected by the TDA percentage, with settlement and damping ratio increasing, and breakage index and stiffness decreasing with higher TDA percentages.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Engineering, Chemical
Mehdi Eshaghzadeh, Meysam Bayat, Rassoul Ajalloeian, Sayyed Mahdi Hejazi
Summary: This study investigates the enhancement of mechanical characteristics of ceramic fiber-reinforced soil samples by attaching nanosilica particles to the fiber surface. Results show that the addition of ceramic fibers significantly increases the shear strength of silty sand, while the addition of nanosilica noticeably increases cohesion. However, the dilative behavior of the soil decreases with the addition of ceramic fibers, and in most cases, nanosilica has a negative effect on increasing the CBR of fiber-reinforced specimens.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Sohrab Pahlevani, Kazem Jadidi, Sayyed Mahdi Abtahi, Sayyed Mahdi Hejazi, Moses Karakouzian
Summary: The accumulation of steel slag is a major issue for steel manufacturing companies due to its space occupancy in the company's yard. Investigators have suggested various applications for using slag in other industries, with potential for using slag as an aggregate in road and railway construction. This research studied the potential use of gilsonite-modified slag as a replacement for traditional subballast material in railway construction, showing significant improvement in shear strength properties.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Materials Science, Composites
Zahra Jamshidi, Sayyed Mahdi Hejazi, Mohammad Sheikhzadeh, Azam Alirezazadeh
Summary: The study investigates the impact of thermal cycles of different durations on glass fiber reinforced polyester composites. It found that porosity and mechanical properties showed significant changes in long cycles, especially when fabric reinforced samples were further reinforced by NPs. The study also showed that fiber deformation was a hidden factor affecting the elastic modulus of the composites.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Materials Science, Textiles
Mehrdad Masoumi, Sayyed Behzad Abdellahi, Sayyed Mahdi Hejazi
Summary: In this study, filament wound pipes were fabricated using glass and polypropylene yarns with different winding angles, and their bending behavior was investigated. The experimental results showed that a winding angle of 55 degrees was superior in improving the flexural strength of the composite. Additionally, using hybrid yarn to manufacture composite samples increased flexural strength and energy absorption. A multi-scale finite element model was used to predict the flexural behavior of the composites, showing good agreement with experimental results.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Textiles
Reyhaneh Laghaei, Seyyed Mahdi Hejazi, Hossein Fashandi, Saleh Akbarzadeh, Samira Shaghaghi, Alireza Shamaei-Kashani
Summary: Incorporation of hollow fibers in polymer base composites has attracted great interest due to their flexibility and lightweight structure. This study aimed to investigate the fracture toughness and impact resistance of E-glass/epoxy composites hybridized with a layer of polyethylene terephthalate hollow fibers. The results showed that PETHF-STs weakened the mechanical performance, while PETHF-FIs enhanced the fracture toughness and impact resistance.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Composites
Fatemeh Shahramforouz, Seyed Mahdi Hejazi, Aboozar Taherizadeh
Summary: This article investigates the impact of structural parameters on the tribological, mechanical, and thermal functions of composites. The hybrid-Kevlar/PTFE-55 degrees composite exhibited the best tribological and mechanical performance, with tungsten carbide (WC) used to increase thermal conductivity. The results may aid in developing self-lubricant composites embedded in WC fillers applicable in bearings.
POLYMER COMPOSITES
(2022)
Article
Engineering, Mechanical
Sayyed Behzad Abdellahi, Sayyed Mandi Hejazi, Hossein Hasani
Summary: This study investigated the thermal behavior of three different TRC samples through heat transfer testing and 3D finite element modeling, showing that increasing spacer yarn orientation angle can reduce thermal conductivity. The research utilized theoretical models and experimental data to study heat transfer properties, with FE results showing good agreement with experimental data.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Civil
Mohsen Nourmohamadi, Hamid Hashemolhosseini, Sayyed Mahdi Abtahi, Sayyed Mahdi Hejazi
Summary: This study introduces a new type of geotextile sandwich structure that encapsulates soil and silica aerogel to prevent frost-susceptible-soil from cooling flows. The most effective reduction of thermal conductivity was achieved with 1% and 2% silica aerogel content. GSALs reduced the rate of temperature drop in frost-susceptible-soil by an average of 88%. Increasing GSAL thickness had a significant impact on its performance compared to increasing aerogel content.
TRANSPORTATION GEOTECHNICS
(2022)
Editorial Material
Construction & Building Technology
Sohrab Pahlevani, Kazem Jadidi, Sayyed Mahdi Abtahi, Sayyed Mahdi Hejazi, Moses Karakouzian
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Editorial Material
Construction & Building Technology
Vishnu Diyaljee
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Materials Science, Composites
Zahra Jamshidi, Sayyed Mahdi Hejazi, Mohammad Sheikhzadeh, Azam Alirezazadeh
Summary: Fiber reinforced polymer composites (FRPCs) have wide applications but their physical/mechanical properties can be affected by thermal shocks and thermal cycles. The understanding of their behavior under these conditions is essential to reduce failure risks.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Engineering, Manufacturing
Reyhaneh Laghaei, Seyyed Mahdi Hejazi, Hossein Fashandi, Saleh Akbarzadeh, Samira Shaghaghi, Alireza Shamaei-Kashani, Bijan Jahanara, Elaheh Shahsavari
Summary: Triaxial E-glass fabric/CNCs/epoxy composites were fabricated using the vacuum-assisted resin infusion procedure. The effects of mixing medium and CNC concentration on the mechanical properties of the composites were evaluated. Incorporation of CNCs enhanced the fracture toughness and energy absorption during fracture of the composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Civil
Alireza Rezaei, Mohammadali Rowshanzamir, Sayyed Mahdi Hejazi, Milad Banitalebi-Dehkordi
Summary: In this study, geotextiles were used as superabsorbent geotextiles to decontaminate soil polluted with crude oil. The ability of these geotextiles to absorb oil is better than that of absorbing water. The removal efficiency of the absorbent geotextile was evaluated, and the shear strengths of the decontaminated soil samples were compared with those of contaminated soil through direct shear tests.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Construction & Building Technology
Marjan Safari, Mohammadali Rowshanzamir, Sayyed Mahdi Hejazi, Milad Banitalebi-Dehkordi
Summary: This study investigated the combined effect of a waterproof polymer and rubber powder, confining pressure, and cyclic stress ratio on the properties of sand-rubber-polymer mixtures. The results showed that the inclusion of 4% rubber improved adhesion and increased the compressive strength and shear modulus. However, the inclusion of 8% rubber resulted in weaker bonds and reduced performance due to various mechanisms.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
