Article
Multidisciplinary Sciences
Lukasz Wargula, Dominik Wojtkowiak, Mateusz Kukla, Krzysztof Talaska
Summary: This study presents experimental research results on the mechanical properties of pine wood, focusing on the effects of moisture content and force direction. By developing a model using finite element analysis, the study aims to estimate the maximum destructive force of the material and design energy-efficient and durable grinding machines. The accuracy of the model in determining the maximum destructive force is around 8%, with an average coverage of about 77% for elastic-plastic deformations.
Article
Engineering, Civil
A. Deifalla
Summary: Punching shear failure of reinforced concrete slabs is a sudden and catastrophic event. Developing a physically sound punching shear mechanical model can help understand and predict the behavior of slabs under in-plane tensile forces and punching shear.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Mechanical
Tianyu Huang, Lingling Chen, Xinyu Xing, Shengyou Yang
Summary: This study introduces a new method to induce large bending deformation in soft slabs by vertically compressing them between two rigid plates, finding that the deformed inner and outer radii and stretches of the slab are related to the size of the slab rather than its stiffness. A linear model and finite element analysis are used to explain the experimental data, confirming that the center portion of the compressive soft slabs is approximately in pure bending.
EXTREME MECHANICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
S. Shrikanth, Suresh Neelakantan, Rajesh Prasad
Summary: The elastic properties of crystalline solids are anisotropic. The shear modulus G(n,m) depends on both the shear plane normal n and the shear direction m. This study investigates the anisotropy of the shear modulus within shear planes and presents novel 3D surfaces to represent this anisotropy. It is found that shear planes with G(n,m) independent of m can exist in all crystal systems.
MECHANICS OF MATERIALS
(2023)
Article
Mechanics
Mingming Chen, Minghui Fu, Lingling Hu
Summary: This paper presents the design of a novel metamaterial with multiple load-bearing modes, exhibiting peculiar properties under tension and compression. The material allows adjustment of the ratio of tensile elastic modulus to compressive elastic modulus and features an asymmetric stiffness matrix, breaking the classical model of symmetric stiffness matrix for conventional materials. The material is expected to have applications in various fields.
COMPOSITE STRUCTURES
(2021)
Article
Geosciences, Multidisciplinary
Niccolo Satta, Luiz Fernando Grafulha Morales, Giacomo Criniti, Alexander Kurnosov, Tiziana Boffa Ballaran, Sergio Speziale, Katharina Marquardt, Gian Carlo Capitani, Hauke Marquardt
Summary: This study experimentally determined the complete single-crystal elasticity of antigorite and used the results to model the seismic properties of antigorite-bearing rocks. The study showed that seismic shear anisotropy has a low sensitivity to serpentinization, making it challenging to detect serpentinized slabs using seismological approaches.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Forestry
Marly G. C. Uzcategui, Frederico J. N. Franca, R. Daniel Seale, Christopher Adam Senalik, Robert J. Ross
Summary: This study analyzed the bending modulus of elasticity and tensile properties of southern pine lumber, and found relationships between different properties, providing useful insights for performance analysis of pine lumber.
WOOD AND FIBER SCIENCE
(2022)
Article
Engineering, Civil
Zefang Wang, Jiachuan Yan, Youzhu Lin, Feng Fan
Summary: This study investigated the mechanical performance of steel-UHPC-steel composites through static tests and numerical simulations, discussing the influence of shear connector arrangement on structural behavior and providing design recommendations accordingly.
ENGINEERING STRUCTURES
(2021)
Article
Construction & Building Technology
Pablo G. Fernandez, Antonio Mari, Eva Oller
Summary: This study investigates the effect of unidirectional in-plane tensile forces on the punching-shear strength of reinforced concrete slabs through experimental tests. The results show that the punching-shear strength decreases almost linearly with the increase of tensile force, until concrete cracking occurs.
STRUCTURAL CONCRETE
(2021)
Article
Engineering, Geological
Lang Liu, Silvio B. Giger, Derek Martin, Rick Chalaturnyk, Kristof Schuster, Nathan Deisman, Lukas Keller
Summary: Opalinus Clay is the designated host rock for a deep geological repository of radioactive waste in Switzerland. The determination of its geo-mechanical properties relies heavily on laboratory tests on small specimens. The pressuremeter tests were performed in Opalinus Clay to assess its in-situ elastic stiffness at a larger scale. The shear modulus of the Opalinus Clay is dependent on the expansion pressure and exhibits a nonlinear dependence on strain increment.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Zulkuf Kaya, Ayfer Erken, Huseyin Cilsalar
Summary: Determining shear modulus and damping ratio in the field is crucial when shear strains exceed those from laboratory tests, particularly for structures with significant interaction with soil. Experimentally, as plasticity increases, the elasticity modulus ratio of soils also increases, indicating higher seismic performance demands for structures with soil profiles.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Chemistry, Physical
Juozas Masenas, Remigijus Salna, Linas Juknevicius, Juozas Valivonis
Summary: The article discusses experimental and numerical research of the layered reinforced concrete slab with plastic inserts, proposing an analytical method and conducting numerical simulation. The study focuses on the shear stiffness of the bond between concrete layers for calculating deflection.
Article
Polymer Science
Khaled Saad, Andras Lengyel
Summary: This study investigates the mechanical behavior of timber beams reinforced with carbon-fibre-reinforced polymers (CFRP) using experimental, analytical, and numerical methods. The results show that CFRP can significantly enhance the capacity, ultimate displacement, and compliance of the beams. The numerical computations based on a beam model and a three-dimensional finite element model provide a close match with the experimental results, indicating the effectiveness of separate moduli of elasticity for tension and compression in modeling reinforced timber beams.
Article
Engineering, Civil
Pablo G. Fernandez, Antonio Mari, Eva Oller
Summary: Research has shown that in-plane tensile forces can affect the punching shear capacity of RC slabs, with a more significant impact under high tensile forces. Additionally, the development of a mechanical model allows for accurate prediction of the influence of tensile forces on punching shear strength.
ENGINEERING STRUCTURES
(2021)
Article
Physiology
Feng Li, Zhen-Ya Wang, Zhi-Jie Zhang, Su-Hong Shen, Jia-Yi Guo, Yan-Xing Guo, Yi-Ran Feng, Lin Zhang, Yong-Bing Wen, Yun-Fei Zhang, Yi-Ming Fan, Meng-Meng Fan
Summary: Shear wave elastography measurement of shear modulus may be helpful in the diagnosis and treatment of patients with knee osteoarthritis.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Agricultural Engineering
Giedrius Balciunas, Jadvyga Zvironaite, Sigitas Vejelis, Aleksandras Jagniatinskis, Sergejus Gaiducis
INDUSTRIAL CROPS AND PRODUCTS
(2016)
Article
Materials Science, Composites
Agne Kairyte, Mikelis Kirpluks, Aiga Ivdre, Ugis Cabulis, Sigitas Vejelis, Giedrius Balciunas
POLYMER COMPOSITES
(2018)
Article
Agricultural Engineering
Agne Kairyte, Saulius Vaitkus, Sigitas Vejelis, Giedrius Girskas, Giedrius Balciunas
INDUSTRIAL CROPS AND PRODUCTS
(2018)
Article
Chemistry, Physical
Arunas Kremensas, Agne Kairyte, Saulius Vaitkus, Sigitas Vejelis, Giedrius Balciunas
Article
Agricultural Engineering
Arunas Kremensas, Agne Kairyte, Saulius Vaitkus, Sigitas Vejelis, Sylwia Czlonka, Anna Strakowska
INDUSTRIAL CROPS AND PRODUCTS
(2019)
Article
Agricultural Engineering
Arunas Kremensas, Saulius Vaitkus, Sigitas Vejelis, Sylwia Czlonka, Agne Kairyte
Summary: The study investigates the use of fluoroalkyl acrylate copolymer-based hydrophobizer and expandable graphite as additives to enhance the water and fire resistance of hemp shivs and corn starch-based biocomposite boards for the furniture industry. The results show that a 20 wt.% addition of expandable graphite acts as a flame barrier, significantly improves ignitability parameters, and reduces CO2 and CO emissions, while a 10 g/l solution of hydrophobizer leads to lower water absorption and swelling, forming an effective barrier against water penetration into the hemp shiv aggregates.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Chemistry, Physical
Agne Kairyte, Sylwia Czlonka, Renata Boris, Sigitas Vejelis
Summary: The study modified rigid polyurethane foam by adding sunflower press cake and liquid glass-impregnated sunflower press cake particles, which improved thermal conductivity, compressive strength, and tensile strength of the foam while reducing short-term water absorption. The modified foams showed increased stability and reduced cell size.
Article
Chemistry, Physical
Agne Kairyte, Sylwia Czlonka, Renata Boris, Sigitas Vejelis
Summary: The study found that 10-20 wt.% SFP filler had the most significant positive impact, with improvements in thermal conductivity by 9% and 17%, compressive strength by 11% and 28% perpendicular direction and by 43% and 67% in the parallel direction. Tensile strength showed increments of 49% and 61% at 10 wt.% and 20 wt.% SFP filler. Additionally, SFP filler-modified PUR foams exhibited lower water absorption values and improved microstructures.
Article
Materials Science, Textiles
Sigitas Vejelis, Virgilijus Skulskis, Arunas Kremensas, Saulius Vaitkus, Agne Kairyte
Summary: This research investigates the potential of using Lithuanian wool for the production of thermal insulation materials. By analyzing the quality of wool from different sheep breeds and evaluating different cleaning methods and detergents, the study provides conditions for improving the production and quality management of sheep wool insulation materials.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Chemistry, Physical
Sigitas Vejelis, Saulius Vaitkus, Arunas Kremensas, Agne Kairyte, Jurga Seputyte-Jucike
Summary: Textile waste is generated in various stages of production and can be recycled to produce new products. This study focuses on making acoustic boards using waste from the production of woollen yarns. It was found that around 74% of the waste is suitable for making acoustic boards. The boards made from the waste have similar acoustic characteristics to traditional boards or sound insulation products made from renewable resources.
Article
Chemistry, Physical
Sigitas Vejelis, Meruert Bolatkyzy Karimova, Tokzhan Kuangalyevna Kuatbayeva, Agne Kairyte, Jurga Seputyte-Jucike
Summary: When developing new innovative building materials, it is important to consider their performance characteristics and environmental friendliness. However, producing a fully ecological material for building envelopes is challenging due to the lack of ecological binding materials on the market. Good binding materials are expensive, while cheaper alternatives have poorer adhesive properties and performance characteristics.
Article
Chemistry, Physical
Nerijus Augaitis, Jurga Seputyte-Jucike, Sylwia Czlonka, Arunas Kremensas, Agne Kairyte, Sigitas Vejelis, Giedrius Balciunas, Saulius Vaitkus
Summary: The study investigates the impact of liquid glass, tung oil, and expandable graphite coatings on the behavior of wood scobs as insulation materials. The thermal conductivity, water absorption, surface wettability, and water vapor permeability were evaluated under different coating compositions. The results show that liquid glass and tung oil together can significantly reduce water absorption and thermal conductivity. The addition of expandable graphite has a limited effect on the properties. The three-component coating of liquid glass, tung oil, and expandable graphite shows promising results in improving the fire resistance of wood-based composites.
Article
Polymer Science
Agne Kairyte, Jurga Seputyte-Jucike, Sylwia Czlonka, Sigitas Vejelis, Saulius Vaitkus
Summary: In this study, biopolyurethane foam was modified with 2.5-10 wt.% lignin waste (LigW) and liquid glass (LG)-modified LigW particles at different LigW/LG ratios. The effects on performance characteristics and structural parameters were evaluated. It was found that particles at the LigW/LG ratio of 1:2 showed superior impact on the physical and mechanical properties of bioPUR foams. The incorporation of LigW/LG 1:1 and LigW/LG 1:2 particles enabled the production of dimensionally and structurally stable closed-cell bioPUR foams for thermal insulation applications in building envelopes.
Article
Chemistry, Multidisciplinary
Jurga Seputyte-Jucike, Sigitas Vejelis, Viktor Kizinievic, Agne Kairyte, Saulius Vaitkus
Summary: This paper discusses the production and performance characteristics of lightweight concrete (LWC) made from porous aggregates such as expanded glass (EG) and crushed expanded polystyrene waste (CEPW). The effects of OPC content and substitution of EG with CEPW on thermal conductivity, compressive strength, bending strength, water absorption, deformations, composite structure, and freeze-thaw resistance of LWC were investigated. The presence of CEPW did not negatively impact the strength and water absorption of LWC, while increasing the durability and reducing deformations by modifying the structure.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Textiles
Sigitas Vejelis, Saulius Vaitkus, Audrone Sankauskaite, Arunas Kremensas, Jurga Seputyte Jucike
Summary: This study analyzed waste from woollen yarn production and used it to produce soft thermal insulation mats. The properties of the mats, such as fiber composition, structure, and thermal conductivity, were studied. The study also investigated the fiber waste composition and the micro and macrostructures of the mats. The findings provide insights into the potential application of the waste material and the key factors in the production process.
FIBRES & TEXTILES IN EASTERN EUROPE
(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)
