Article
Multidisciplinary Sciences
Chi Zhang, Mingyang Chen, Sinan Keten, Benoit Coasne, Dominique Derome, Jan Carmeliet
Summary: Wood hygromechanics mechanisms remain unclear due to nanoscopic system size and highly coupled physics. This study uses molecular dynamics simulations to characterize wood polymers, revealing the dominating role of cellulose fiber in wood cell wall mechanics. The moisture-induced anisotropic swelling and weakening of wood cell wall is governed by the interplay of cellulose reinforcement, mechanical degradation of matrix, and fiber-matrix interface.
Article
Construction & Building Technology
Shaofeng Zhang, Ronggui Liu, Chunhua Lu, Yuan Gao, Jiajing Xu, Lu Yao, Yu Chen
Summary: This paper applies digital image correlation (DIC) technology to measure the thickness and elastic modulus of the interfacial transition zone (ITZ) and discusses the influence of water/cement (w/c) ratio on the ITZ. The results show that DIC technology is feasible for measuring the properties of the ITZ.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
E. V. M. Carrasco, V. D. Pizzol, M. A. Smits, R. C. Alves, A. L. C. Oliveira, J. N. R. Mantilla
Summary: This study aims to recycle wood from discarded sleepers to manufacture cross-laminated timber (CLT). The influence of gluing pressure on the shear strength of the glue line was studied, as well as the quality of recycled boards made through visual classification, ultrasound, and three-point bending tests. The efficiency of the CLT was proven by determining the modulus of elasticity using strain gauges. It was concluded that discarded sleepers can be reused for making CLT, ultrasound is an effective tool for mechanical classification of the laminas, and the optimal gluing pressure for the glue line is 1.5 MPa.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Shaofeng Zhang, Ronggui Liu, Chunhua Lu, Junqing Hong, Chunhong Chen, Jiajing Xu
Summary: The influence of nano-SiO2 (NS) on cement paste and the interfacial transition zone (ITZ) was studied in this research. The results showed that NS could effectively improve the mechanical properties of cement paste and ITZ, but excessive NS content would lead to a decrease in mechanical properties.
Article
Materials Science, Multidisciplinary
V. A. Mechnik, M. O. Bondarenko, V. M. Kolodnitskyi, V. Zakiev, I. M. Zakiev, M. O. Kuzin, E. S. Gevorkyan
Summary: The study found that adding CrB2 additives to DCCs can significantly increase the hardness, elastic modulus, and wear resistance of the composite material by refining matrix phases and binding carbon to nanoscale carbides, enhancing the ability of the matrix material to retain diamond grains.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Construction & Building Technology
V Alecci, A. G. Ayala, M. De Stefano, A. M. Marra, R. Nudo, G. Stipo
Summary: This study investigates the elastic modulus of masonry walls through experimentation and numerical assessment. The results show that considering factors such as wall thickness, the double flat-jack test can more accurately predict the elastic modulus of masonry.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Dinesh Kumar Samal, Sonalisa Ray, Hemalatha Thiyagarajan
Summary: The interfacial transition zone (ITZ) in concrete has a significant impact on its properties, but existing studies have simplified the ITZ thickness. This study developed an analytical approach to incorporate non-uniform ITZ thickness and validated it through elastic modulus calculations.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Mechanics
Nhat-Tung Phan, Francois Auslender, Joseph Gril, Rostand Moutou Pitti
Summary: This study analyzes the influence of fibril oscillations and connections on the effective hygro-elastic behavior of the wood cell wall, using two different microstructure models and numerical computations, showing significant effects on the effective moduli of the cell wall.
Article
Multidisciplinary Sciences
Ruxandra Cojocaru, Oonagh Mannix, Marie Capron, C. Giles Miller, Pierre-Henri Jounea, Benoit Gallet, Denis Falconet, Alexandra Pacureanu, Stephen Stukins
Summary: The study reveals the structure and properties of the pollen wall, providing a deeper understanding of the evolutionary success of conifers and other plants over geological time.
Article
Forestry
Joseph E. Jakes, Donald S. Stone
Summary: In order to accurately measure mechanical properties of materials like wood cell walls, traditional nanoindentation methods need to be improved to account for the unique characteristics of these polymeric structures.
Article
Construction & Building Technology
Hui Song, Jinwei Yao, Junzheng Xiang
Summary: Research has found that under F-T conditions, the compressive strength and dynamic elastic modulus of pervious concrete decrease with increasing cycles, and damage in salt water is more severe than in water. SEM results indicate that debonding at the interface between aggregate and cement is the primary cause of pervious concrete deterioration.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Forestry
Jingkui Li, Yanan Wang, Haozheng Zhao, Dawei Qi
Summary: In this study, nanoZnO-coated veneers were prepared by magnetron sputtering on Pinus sylvestris L. var. mongholica Litv veneer. The deposition of ZnO thin film on the wood surface by magnetron sputtering changed the microstructure of the wood surface, enhanced the wood resistance to elastic deformation, and improved the mechanical properties of the wood surface.
WOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Hangwei Lin, Koji Takasu, Hiroki Suyama, Hidehiro Koyamada, Shilun Liu
Summary: This study investigated the effects of modified fly ash on the mechanical properties and durability of concrete, proposed a new equation relating the elastic modulus and compressive strength of concrete, and confirmed the importance of the quality and substitution rate of recycled fine aggregates in these effects.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
E. A. Ekimov, Yu B. Lebed, M. V. Kondrin
Summary: Investigation of elastic properties of nanosized diamond films reveals that their properties significantly depend on surface reconstructions within the range of +/- 5%. There is a strong correlation between lateral contraction/dilation of the surface and its layer elastic modulus. Our research suggests a more complex influence of crystal morphology on the elastic properties of nanodiamonds compared to recent reports, indicating specific dilatation and contraction tendencies for different crystal faces.
Article
Engineering, Biomedical
Dichu Xu, Maria Luisa Hernandez Miranda, Nicholas D. Evans, Bram G. Sengers, Martin Browne, Richard B. Cook
Summary: This study investigated the mechanical properties of thin PAAm hydrogel layers adherent to stiff substrate supports using depth profiling nanoindentation and a poroelastic model for spherical indentation. The results showed that the apparent stiffness and hydraulic conductivity of the thin hydrogel layers were influenced by the constraint of the impermeable substrate. The study also established the relationship between geometrical confinement and the mechanical properties of the thin hydrogel layers.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)