Article
Mechanics
Bulat N. Galimzyanov, Anatolii Mokshin
Summary: The porous titanium nickelide is characterized by unique physical and mechanical properties, and the degree of porosity affects its mechanical behavior under tension, compression, and shear. Different types of pore structures influence the elastic characteristics and resistance to tensile and shear, providing insights for developing and improving amorphous metal foams.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Engineering, Mechanical
Wenli Zhu, Zhenyu Qiu, Jiannan Zhou, Fengnian Jin, Hualin Fan
Summary: This study investigates the influence of size design on the tensile and compressive properties of parallel bamboo strand lumber (PBSL) using different sizes of tensile specimens and compression components. Four nonlinear constitutive models are applied to model the compressive stress-strain curves.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Construction & Building Technology
Abbas Abdulalim Abbara, Abdelrahman Abdelhalim, Mohammed Al-Ajamee, Omer Ahmed, Suman Kumar Adhikary, Mohamedelmustafa Ahmed
Summary: This study investigates the mechanical properties of rubberized concrete and proposes new equations for predicting its properties, improving upon existing models.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Geological
T. Thongprapha, K. Tengpakwaen, J. J. K. Daemen, K. Fuenkajorn
Summary: This study investigates the mechanical properties of rock salt under different confining pressures through compression tests. The results show that the strength of salt is lowest under low confinement and increases as the confining pressure increases. Plastic deformation occurs under high confinement. The orientation of bedding planes has a significant influence on the strength and dilation behavior of salt.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Chemistry, Physical
Masayuki Yamamoto, Masaki Tanaka, Osamu Furukimi
Summary: Nanoindentation testing was conducted to explore the relationships among indentation hardness, elastic work energy, plastic work energy, and total energy for a wide range of pure metal and alloy samples. The results showed that the ratios of elastic work energy to total energy and plastic work energy to total energy were positively and negatively correlated with elastic strain resistance, respectively. Additionally, the ratio of plastic work energy to elastic work energy was found to be well correlated with elastic strain resistance for all the studied materials.
Article
Energy & Fuels
Alberto Minardi, Silvio B. Giger, Russell T. Ewy, Rudy Stankovic, Jorn Stenebraten, Magnus Soldal, Marco Rosone, Alessio Ferrari, Lyesse Laloui
Summary: The triaxial testing of argillaceous rocks and shales presents significant challenges due to their low permeability, sensitivity to environment, and lack of international standards. A benchmark study involving three leading service laboratories demonstrated good reproducibility of effective stress paths under similar initial conditions. Testing on Opalinus Clay shale showed that robust triaxial testing results can be achieved for shales when key challenges are addressed.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2021)
Article
Materials Science, Characterization & Testing
A. Belashov, Y. M. Beltukov, O. A. Moskalyuk, I. Semenova
Summary: This study applied a methodology based on analyzing changes in acoustic wave velocities under static stress to measure the third-order elastic moduli in three polystyrene-based nanocomposites with different fillers. The results demonstrated substantial variations in the nonlinear elastic moduli of composites with different fillers, which were in qualitative agreement with theoretical predictions.
Article
Construction & Building Technology
Hiroshi Sasano, Ippei Maruyama
Summary: The study elucidated the mechanism of change in properties of concrete after drying through numerical calculation, indicating that the impact of drying-induced microcracking around coarse aggregates and the change in mechanical properties of mortar due to drying determine the change in compressive strength. These mechanisms alter the applied load required to reach critical crack width and distribution, leading to the isolation of the rim of the specimen and a decrease in the load sustained by the rim.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Construction & Building Technology
Bin Liang, Hai Zhang, Zhongxian Liu, Jilin Hou
Summary: The investigation of masonry buildings in Chinese villages revealed that over 90% of the buildings were made of masonry structures. The use of mortars in these structures has evolved from mud to white clay/slag and eventually to cement. This article highlights the discrepancy in compressive strength between the Chinese standard code and experimental results, prompting the testing of masonry columns with different types of mortars to modify the equations. The research delves into the stress-strain curve, elastic modulus, Poisson's ratio, and compressive strength of masonry columns. The findings indicate that the compressive strength of the masonry increases with the strength of the mortar. The experimental values were 1.2 times higher than the calculated values specified in the code, leading to the proposal of a revised equation for masonry considering stress-strain relationship, elastic modulus, Poisson's ratio, and compressive strength.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Xiaolian Zhang, Pengcheng Zhai, Xiege Huang, Sergey Morozov, Bo Duan, Wenjuan Li, Gang Chen, Guodong Li, William A. Goddard
Summary: In this study, the intrinsic mechanical properties of thermoelectric clathrate Ba8Au6Ge40 were investigated using density functional theory calculations. The researchers found that the strength of Ba8Au6Ge40 varies depending on the loading direction, with {110}/<001> shearing and <110> tension being the weakest. The stretching and twisting of the Ge-Ge bonds cause distortion in the structure and ultimately lead to material failure.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Geochemistry & Geophysics
Christopher Harbord, Nicolas Brantut, David Wallis
Summary: The study investigates the influence of grain size on the rheological behavior of calcite aggregates in the semi-brittle regime. Compressive triaxial deformation tests are conducted on different rocks with varying grain sizes. The results show that both strength and hardening rate increase with decreasing grain size, and flow stress scales with the inverse of grain size. Microstructural observations reveal high twin densities in deformed samples, which increase with stress. The effect of twins on dislocation accumulation and hardening rate is likely smaller than the effect of grain size.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Engineering, Geological
Aly Abdelaziz, Giovanni Grasselli
Summary: The study investigated the interpretation of elastic modulus by conducting experiments on various systems and found that system compliance has a significant impact on the results, indicating the need to evaluate system compliance separately for each setup.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Construction & Building Technology
Satheeskumar Navaratnam, Hendrik Wijaya, Pathmanathan Rajeev, Priyan Mendis, Kate Nguyen
Summary: The research investigated the effects of elevated temperature on biochar-based mortar, finding that increasing biochar replacement reduces compressive strength and residual strength. A new stress-strain model was developed to predict the mechanical behavior of biochar-based mortar post fire.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Chao Liu
Summary: In this study, the authors use Biot's theory of poroelastodynamics to provide the first analytical solution for a fluid-saturated porous cylinder subjected to a forced deformation test. The solution captures the coupled responses of displacement, pore pressure, and stress, and explains the mechanisms for elastic moduli dispersion. The effects of loading frequency, material's poromechanical characteristics, sample size, and boundary conditions on moduli dispersion are comprehensively investigated, with excellent agreement between the analytical solution and experimental measurements.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Geosciences, Multidisciplinary
Arqam Muqtadir, Saud Al-Dughaimi, Taqi Alzaki, Jack Dvorkin
Summary: This study compares the P-wave and S-wave velocities obtained under different hydrostatic loading conditions using ultrasonic pulse transmission experiments. The results show significant differences in velocities when a smaller hydrostatic stress is added to axial stress, but these differences become smaller as the hydrostatic stress increases. The findings suggest that laboratory hydrostatic experiments can be used for in-situ velocity estimates even under strong in-situ contrasts between the vertical and horizontal stresses.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Construction & Building Technology
Diego J. De Souza, Leandro F. M. Sanchez, Juarez Hoppe Filho, Marcelo H. F. Medeiros
Summary: This paper evaluates the physical and chemical properties of mortar mixtures with different binders and exposed to different sulphate solutions. A theoretical approach to describe the susceptibility of cementitious mixtures against sulphate attack is proposed. The results show that the amount of portlandite and the potential of ettringite formation are well correlated with the expansion and damage caused by sulphate attack.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Yu Chen, Hossein Rahmani, Erik Schlangen, Og uzhan Copurog
Summary: This study presents a method to accelerate the production of limestone-calcined clay-based cementitious materials using Ca(NO3)2 solution in 3D printing, and investigates the effects of adding Ca(NO3)2 solution on the material's properties. The results show that adding Ca(NO3)2 solution can improve buildability, accelerate initial setting, and increase compressive strength.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jing Xu, Xianzhi Wang, Wu Yao, Qing Chen, Hehua Zhu, Surendra P. Shah
Summary: Concrete cracks in marine engineering are caused by the hostile seawater environment, leading to serious deterioration of infrastructures. Microbial induced carbonate precipitation (MICP) is an effective and environmentally friendly approach for self-healing of concrete cracks. However, the formation and structure of MICP products for crack healing in seawater are still unclear, which hinders the application of MICP in marine structures.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhenbo Wang, Peng Sun, Yurun Fan, Yudong Han, Yudong Hu
Summary: This study investigates the potential use of engineered cementitious composites (ECCs) with strain-hardening and self-healing characteristics as a cover material in wet coral sand exposure. The results show that ECCs can effectively close cracks, reduce water permeability, and restore the load-carrying capacity of structures. Additionally, lower strain levels are associated with decreased rebar corrosion.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhengxian Yang, Xiaoli Xiong, Kang Li, Bruno Briseghella, Giuseppe Carlo Marano, Shanghong Chen
Summary: This study investigates the long-term volume stability and strength development of engineered cementitious composites (ECC) containing high-volume steel slag (SS). It is found that the strength of ECC with SS starts to decline after 90 days, while the decline is more significant compared to the matrix. The expansion of SS reduces the fracture toughness of the matrix, leading to an increase in toughness and ductility of the ECC. The introduction of ground granulated blast furnace slag (GGBFS) and PVA fibers can reduce the volume expansion and strength loss caused by SS expansion.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Bin Xi, Zhewen Huang, Salam Al-Obaidi, Liberato Ferrara
Summary: This study investigates the self-healing capabilities of Ultra-High Performance Concrete (UHPC) under the combined influence of mechanical and environmental factors. The results reveal that UHPC with narrow cracks exhibits a higher degree of self-healing, especially when exposed to tap water. Furthermore, prolonged exposure mitigates the inhibitory effect of aggressive ions on self-healing.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhichao Xu, Huayang Sun, Yanlin Huo, Minjie Jia, Zhitao Chen, Yingzi Yang
Summary: In this study, MXene was used to modify the surface of polyethylene fiber, improving the interfacial properties and tensile properties of strain hardening cementitious composites. The MXene-coated fiber showed increased tensile stress and strain, reduced crack width and spacing, and enhanced frictional bond strength between the fiber and matrix.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Bao Lu, Yeqiang Zhou, Lei Jiang, Zhensen Liu, Guihua Hou
Summary: This study investigated the leaching rate of Ca2+ from magnesium slag (MS) and developed a leaching-carbonation method to convert MS into high-purity vaterite and supplementary cementitious materials. The wet carbonation process with glycine as a crystal modifier successfully produced spherical vaterite with high purity and surface area. The leachate solid residue (LSR) obtained from the leaching process of MS showed a smaller size destruction and higher surface area compared to Portland cement, leading to accelerated hydration process and improved compressive strength and pore structure development. This work provides a novel treatment method for MS and enables its high value-added utilization.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Gustavo Henrique Nalon, Jose Carlos Lopes Ribeiro, Leonardo Goncalves Pedroti, Roberto Marcio da Silva, Eduardo Nery Duarte de Araujo, Gustavo Emilio Soares de Lima
Summary: The mechanical behavior of mortar joints is crucial for masonry's structural performance. This study investigated the effects of different lime/cement ratios and carbon black nanoparticles content on the properties of mortars. The results showed that increasing lime content decreased mortar strength but increased self-sensing properties at the end of the percolation zone.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Yifei Wang, Lei Lei, Caijun Shi
Summary: The effects of DEIPA and EDIPA at dosages of 0.02% and 0.05% on the hydration and strength development of cement-fly ash-limestone ternary blend were investigated. It was found that both dosages of DEIPA and EDIPA promote the chemical effect of limestone and the hydration of aluminates from cement and fly ash. The hydration of silicates was accelerated by 0.02% of DEIPA or EDIPA but delayed by 0.05% due to excessive aluminates hydration. DEIPA and EDIPA also refine the pore structure and increase compressive strength of the blend mortar.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Du Pan, Ditao Niu, Zongjin Li
Summary: A thick-walled cylinder model was developed in this study to analyze the cracking behavior of seawater sea-sand concrete (SSC) cover. Damage variables were introduced to determine the extent of damage for each cracked ring, and a predictive model for the cracking time of SSC cover was established. The accuracy of the model was verified using the Digital Image Correlation (DIC) technique.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jiangyu Wu, Hong S. Wong, Hao Zhang, Qian Yin, Hongwen Jing, Dan Ma
Summary: This study explores a method of strengthening cemented rockfill by using well-graded gangue and partially replacing Portland cement with fly ash and a premixed low-alkalinity activator. The research investigated the effects of activator dosage and curing time on the mechanical properties, composition, and microstructure of cemented rockfill. Results show improved performance with low cement content and the use of a low-cost activator. The addition of premixed activator to fly ash enhanced the formation of specific minerals and caused densification of the microstructure. The study reveals an effective and low-cost method for recycling mining wastes and reducing cement.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Juntao Dang, Xiaosong Tang, Jianzhuang Xiao, Aihong Han
Summary: This study proposes a solution to improve the fresh stability and thermal insulation of alkali-activated foamed concrete by adding recycled brick powder. The study investigates the effects of activator modulus and Na2O concentration on the properties of alkali-activated foamed concrete with different bases. The presence of alkaline activator negatively affects the foamability and foam stability, but adjusting the activator concentration can achieve shorter initial setting time and higher fluidity loss. In addition, the increased activator concentration resulted in changes in the pore structure of the foamed concrete.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jiandong Zuo, Bo Wu, Biqin Dong, Feng Xing, Jun Ma, Guanqi Wei
Summary: Nitrite ion intercalated Ca-Al and Mg-Al layered double hydroxides (LDHs) were successfully synthesized using two modified methods. The Ca-Al LDH synthesized by hydrothermal method (H-C-LDH) exhibited the best properties. The intercalated LDHs improved the mechanical properties, chloride penetration resistance, and permeability resistance of cement mortars without affecting the fluidity. Additionally, the intercalated LDHs provided better corrosion resistance.
CEMENT & CONCRETE COMPOSITES
(2024)
Review
Construction & Building Technology
Jingbin Yang, Zhenping Sun, Nele De Belie, Didier Snoeck
Summary: This review paper provides an overview of internal curing mechanism, common internal curing agents, and the most promising agent-superabsorbent polymers in alkali-activated materials (AAM) systems. The introduction of voids by internal curing agents typically has a negative impact on mechanical properties, but continuous water release during internal curing counteracts this effect by promoting hydration. While the effect of internal curing in reducing autogenous shrinkage of AAM systems has been well-established, the impact on drying shrinkage varies widely in different studies.
CEMENT & CONCRETE COMPOSITES
(2024)