Article
Chemistry, Physical
Huating Chen, Zhenyu Sun, Xianwei Zhang, Jinhong Fan
Summary: This study conducted a four-point bending fatigue test on 97 C50 concrete specimens in the laboratory, studying the flexural fatigue behavior of plain and reinforced concrete. The statistical analysis of the test results derived empirical fatigue S-N equations and found that the stress ratio is a key factor affecting the fatigue life of concrete. The presence of steel reinforcement slightly lengthened the fatigue cracking initiation life of concrete.
Article
Construction & Building Technology
Liang Zhang, Honggang Lei, Yu Shen, Shujia Zhang, Zichun Zhou
Summary: Ten constant-amplitude fatigue tests were conducted on M20 torque-shear high strength bolts, and the fatigue performance, stress concentration and fracture characteristics were analyzed. The allowable nominal stress amplitude and hot-spot stress amplitude were found to be 96.371 MPa and 283.296 MPa respectively. The existing design provisions were found to be generally conservative.
Article
Engineering, Mechanical
C. M. Sonsino, J. Baumgartner, M. Breitenberger
Summary: This paper compares two methods for transforming a stress or load spectrum into a damage equivalent constant amplitude loading, namely the modified equivalent stress (MES) and the required fatigue strength (RFS) concepts. The MES-method results in a damage equivalent stress depending on the selected position of the Woehler-line, while the RFS-method delivers a damage equivalent fictitious Woehler-line indicating the lowest necessary strength quality and allows for experimental durability proof of any amplitude-cycle combination along it.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Fan You, Surong Luo, Jianlan Zheng
Summary: Using recycled aggregate for producing concrete is an effective way to realize the resource utilization of construction and demolition waste. Understanding the variation law of the residual compressive strength of recycled aggregate concrete under fatigue loading is significant for its practical application under repeated loads. The study revealed that the residual compressive strength attenuation law of recycled aggregate concrete is similar to that of natural aggregate concrete, with a gradual acceleration in the later stages of fatigue loading. Compared to natural aggregate concrete, the damage to recycled aggregate concrete develops faster in the initial stages of fatigue loading and slower in the later stages.
FRONTIERS IN MATERIALS
(2022)
Article
Construction & Building Technology
G. Murali, Herda Yati Binti Katman, Leong Sing Wong, Mohd Rasdan Ibrahim, Parthiban Kathirvel, Sallal R. Abid
Summary: Sustainable and ecologically friendly building practices require increased conservation and recycling of renewable resources. Using recycled construction materials as aggregate in new concrete can be a crucial step in making the material more environmentally friendly. This study examines the impact performance of recycled aggregate concrete (RAC) with different levels of recycled aggregate (RA) replacement. The findings suggest that immersing the RA in a 10% MgSO4 solution for five days can enhance the impact strength of RAC, with a recommended replacement ratio of 20%.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Hao Chen, Fan Yang, Zhen Wu, Bowen Yang, Junzhou Huo
Summary: This paper proposes a nonlinear fatigue damage accumulation model under variable amplitude loading considering the loading sequence effect. The model is validated and compared through experimental data, and it is found that the prediction accuracy of the proposed model is significantly higher than the other two models, while the difficulty of using the proposed model is lower than that of similar models.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Multidisciplinary Sciences
Sunil Garhwal, Shruti Sharma, Sandeep Kumar Sharma
Summary: The research evaluates the behavior of large-sized reinforced concrete beams corroded to different levels under flexural loading using local acoustic emission technique. As corrosion level increases, the ultimate load-carrying capacity and midspan deflections decrease significantly, indicating increased brittleness and decreased ductility in the corroded beams. AE monitoring shows various stages of failure progression in corroded RC beams under flexural loading, with a significant drop in cumulative AE hits as corrosion level increases.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Alirio Andres Bautista Villamil, Juan Pablo Casas-Rodriguez, Alicia Porras Holguin, Maribel Silva Barrera
Summary: This study experimentally investigated the effects of different adhesive thicknesses on the adhesive joint under impact and constant amplitude fatigue loading, revealing that the crack propagation rate under impact fatigue is three orders of magnitude greater than that under constant amplitude fatigue.
Article
Chemistry, Physical
Abdulnaser M. Alshoaibi
Summary: This study conducted a numerical analysis of fatigue crack growth using ANSYS Mechanical R19.2, investigated the influence of stress ratio on fatigue life and stress intensity factor, and identified the propagation paths of fatigue cracks.
Article
Construction & Building Technology
Nabila Rezende de Almeida Cerqueira, Vitor Moreira de Alencar Monteiro, Felipe Rodrigues de Souza, Daniel Carlos Taissum Cardoso, Flavio de Andrade Silva
Summary: This study investigated the behavior of pre-cracked ultra-high performance concrete (UHPC) under flexural fatigue by quantifying its mechanical deterioration using crack mouth opening displacement (CMOD), stiffness, and energy dissipation rate. The flexural fatigue tests were conducted at a frequency of 6 Hz on notched pre-cracked prisms at different maximum load levels. The results showed that UHPC had a longer fatigue life and better performance compared to 50 MPa SFRC. Additionally, a linear relationship between residual bending strength and initial stiffness was observed, and equations were proposed to predict fatigue life based on the upper load limit.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Ocean
Selase Kwame Mantey, Yi Zhang, Jianqun Jiang, Evans Amponsah, Zhenyu Wang
Summary: This study investigates the damage accumulation process of grouted connections of offshore wind turbines under variable axial fatigue load. Through cyclic compression tests and finite element numerical simulations, it is found that the grout damage under low load range can be accelerated by sudden large loads, and larger load range results in greater damage accumulation and reduced bearing capacity of the connection.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Mechanical
Xiangnan Liu, Wen-Bin Shangguan, Xuezhi Zhao
Summary: In this study, the residual fatigue life of natural rubber components under variable amplitude loads is predicted using a support vector machine (SVM) model and a nonlinear fatigue cumulative damage (NFCD) model. The experimental results demonstrate that the prediction accuracy of these models is higher than that of the traditional Miner criterion.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
A. L. Pinto, G. M. J. Almeida, R. Talemi, J. A. Araujo
Summary: This study proposes a numerical methodology for the life assessment of components under fretting fatigue and variable amplitude loading. Experimental tests were conducted to analyze the effects of different loading sequences. The proposed methodology includes wear effect, crack propagation, and a new non-linear damage model.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Reza Masoudi Nejad, Zhiliang Liu, Wenchen Ma, Filippo Berto
Summary: The paper examines the impact of variable amplitude service loading conditions and wear phenomenon on the reliability analysis of rail steel. It utilizes the exact geometry of rail profiles in railway systems and the boundary element method to evaluate fatigue reliability for each failure mode caused by multiple site fatigue cracks propagation in rail steel.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Construction & Building Technology
Jongho Park, Jungbhin You, Sun-Kyu Park, Sungnam Hong
Summary: The study verified the flexural behavior and fatigue performance of textile-reinforced mortar (TRM)-strengthened beams, finding that using straightened carbon textile can improve efficiency. Under cyclic loading, the efficiency of TRM-strengthened beams was lower than monotonic loading, with alkali-resistant (AR) glass and non-straightened carbon having an average efficiency of 0.86 compared to monotonic loading.
Article
Construction & Building Technology
Sridhar Reddy Kasu, Nilanjan Mitra, Amarnatha Reddy Muppireddy
Summary: The study investigates the fatigue performance of concrete with polyester microfiber under dynamic loading, finding that a fiber dosage of 0.9 kg/m³ significantly affects fatigue lives. S-N curves were formulated to analyze the relationship between fatigue performance and fiber dosage. Covariance analysis showed that initial stiffness and stress levels significantly affect fatigue lives.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Sunil Rawat, Nilanjan Mitra
Summary: Using molecular dynamics simulations, this study investigates the evolution dynamics of twinning in single-crystal Ti under shock loading. The activation of twin variants in single-crystal Ti follows the Schmid criterion, but the activation time varies even with equal Schmid factors. The growth rate of twins is influenced by the number of activated twin variants, indicating that twin nucleation and growth depend on the loading conditions.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Materials Science, Multidisciplinary
Sunil Rawat, Nilanjan Mitra
Summary: Classical molecular dynamics simulations were used to study the microstructural evolution of single crystal titanium under equal channel angular extrusion process (ECAE). Different deformation mechanisms were observed when shear was applied along different directions, with twinning and phase transformation occurring in one case and only dislocation slip in the other. The volume fraction of the α-phase shows a peak and then decreases, indicating the instability of the omega-phase.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Construction & Building Technology
Prodip Kumar Sarkar, Nilanjan Mitra
Summary: This study investigates the stress-strain curve variations of Portlandite mineral under different compressive loading conditions, providing explanations from the perspective of molecular structure deformations. Changes in bond order and partial atomic charges were calculated and compared with the observed stress-strain curves.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Sridhar Reddy Kasu, Sandesh Patel, Amaranatha Reddy Muppireddy
Summary: Research on the behavior and structural integrity of square-shaped short slabs in highway pavement has attracted significant interest, but studies on curling deformations and performance are limited. This study focused on measuring curling displacements of cast-in-situ short paneled concrete pavements on a lean concrete base in NH-18 test sections. The results show that slab length has a more significant impact on curling compared to thickness and interface conditions, and there is a time lag between maximum temperature gradient and slab response.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Construction & Building Technology
Sridhar Reddy Kasu, Jagadeesh Tangudu, Anush K. Chandrappa, Muppireddy Amaranatha Reddy
Summary: This study investigates the influence of dry lean concrete (DLC) stiffness on the tensile stresses in plain cement concrete (PCC) slabs using Finite Element (FE) analysis. Improved DLC base stiffness reduces stresses in PCC slabs, with varying effects depending on the bonded or un-bonded base and positive or negative temperature differentials in the concrete pavement.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Materials Science, Ceramics
K. T. Ramesh, Lori Graham-Brady, William A. Goddard, Ryan C. Hurley, Mark Robbins, Andrew L. Tonge, Amartya Bhattacharjee, Joel T. Clemmer, Qinglei Zeng, Weixin Li, Yidi Shen, Qi An, Nilanjan Mitra
Summary: The study describes behavior models for hot-pressed boron carbide in extreme dynamic environments and the integration of physics-based models for deformation and failure mechanisms into a continuum model for the material. The models show that the importance of amorphization and fracture depends on geometry and impact conditions, providing guidelines for improved boron carbide materials design.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Multidisciplinary Sciences
Dipak Prasad, Nilanjan Mitra
Summary: Simultaneous high-temperature and high-pressure studies have revealed the phase transformation of liquid water to a structure similar to ice-VII, with complex hydrogen dynamics. This study provides new characterization methods for the plastic crystal phase of water and will guide further investigations in this field.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Chemistry, Physical
Dipak Prasad, Nilanjan Mitra
Summary: In this study, a comprehensive understanding of why alite undergoes faster hydration compared to belite is achieved through simulation. A new methodology for assessing crystal surface reactivity is also proposed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Civil
Sridhar Reddy Kasu, Sandesh Patel, Anush K. Chandrappa, Amaranatha Reddy Muppireddy
Summary: This study investigates the curling behavior of cast-in-situ short paneled concrete pavements (CiSPCP) through field observations and theoretical analysis. The findings show that the occurrence of maximum slab curl does not align with the maximum temperature gradient, indicating a lag in stress development. This observation is important for the design and construction of concrete pavements.
TRANSPORTATION RESEARCH RECORD
(2022)
Article
Chemistry, Inorganic & Nuclear
Dipak Prasad, Nilanjan Mitra
Summary: This study demonstrates the catalytic activity of hydrogen bonds in the silicate oligomerization reaction pathway and shows that the presence of hydrogen bonding enhances the energetic favorability of the anionic-I mechanism. It also reveals that hydrogen bonds play a role in the Si-OH rupture process and that the strength of hydrogen bonds affects the activation barrier. Furthermore, the study suggests that similar effects can be observed in the oligomerization of silicates containing metallic ions in sol-gel chemistry and zeolite synthesis.
INORGANIC CHEMISTRY
(2023)
Article
Mechanics
Atri Nath, Aninda Pal, Prabhakar Akurati, Ritwik Ghoshal, Nilanjan Mitra
Summary: Denticle microstructures in shark skin have been found to significantly influence the natural frequency of free vibration, without altering the mode shapes. The reduction in spacing between denticles further reduces the natural frequency. Understanding these effects of wettability alterations on free vibration response is important for efficient design.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Materials Science, Multidisciplinary
Nilanjan Mitra, K. T. Ramesh
Summary: Despite the existence of several studies on 6H SiC in literature, there is still a lack of comprehensive understanding of the material's molecular deformation mechanisms under different loading conditions. Experimental challenges arise from the material's brittleness, making it difficult to determine in-situ molecular deformation mechanisms under applied loads. Additionally, the complex material structure and bonding environment hinder computational identification of various types of inelasticity mechanisms. A molecular dynamics study on pristine single crystals of 6H SiC has been conducted to investigate the material's molecular deformation mechanisms and inherent orientational anisotropy. The study provides insights into experimentally observed defect nucleation and evolution mechanisms through detailed analysis of radial distribution functions, x-ray diffraction, and phonon vibrational studies of the single crystal. The study covers room temperature, initial high temperature, and various confinement effects (including hydrostatic and biaxial loading cases), revealing an increase in stress and stiffness under confinement and a decrease with increasing initial temperature compared to uniaxial stress loading conditions at room temperature.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2023)
Article
Mechanics
Sunil Rawat, Nilanjan Mitra
Summary: Atomistic simulations were used to investigate the dynamics of shock-induced bubble collapse in water. The study found distinct differences in response between an empty bubble and a bubble filled with N-2 gas. The mechanism of the bubble and the time taken for collapse were changed when N-2 gas was introduced, and numerous new chemical species were observed.
Article
Chemistry, Physical
Dipak Prasad, Nilanjan Mitra
Summary: This study presents a detailed theoretical investigation on the chemical reaction pathway for the dimerization process in the presence of a divalent cation. It has been found that an increase in pH of the solution lowers the activation barrier of the dimerization reaction, while the addition of divalent cations raises the activation barriers and delays the reaction.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
