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Effect of granite waste and steel fibers on the mechanical properties of geopolymer concrete before and after fire exposure

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Journal of materials Research and Technology 2025年 37卷 1106-1118页

作者： Peem Nuaklong Phonlayuth Thongpasuk Kantipok Hamcumpai Pitcha Jongvivatsakul Sawekchai Tangaramvong Thanyawat Pothisiri Suched Likitlersuang Research Unit in Science and Innovative Technologies for Civil Engineering Infrastructures Department of Civil Engineering Thammasat School of Engineering Faculty of Engineering Thammasat University Pathumthani 12120 Thailand Centre of Excellence in Innovative Construction Materials Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand GreenTech Nexus: Research Center for Sustainable Construction Innovation Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Centre of Excellence in Applied Mechanics and Structures Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Fire Safety Research Center Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Centre of Excellence in Geotechnical and Geoenvironmental Engineering Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

This study investigates the post-fire performance and mechanical properties of geopolymer concrete incorporating granite industry waste as a full replacement for natural fine aggregates, reinforced with steel fibers. High-calcium fly ash was used to produce high-strength concrete cured at room temperature. The results indicated that incorporating granite waste and steel fibers reduced workability due to increased internal friction. The lowest slump flow (37 cm), observed in the mix with 2 % steel fibers, represented a 38 % reduction compared to the control mixture. Despite the reduced workability, the concrete achieved a 28-day compressive strength of 55 MPa and a 45 % increase in flexural strength with 2 % steel fibers. Toughness improved by up to 13 times compared to concrete without fibers. Post-fire testing showed that granite-waste concrete retained mechanical performance comparable to that made with natural sand. After 30 min of fire exposure, the residual compressive strength of concrete without fibers dropped to 39 % of its original value, while flexural strength decreased by approximately 70 %. Incorporating 1 % steel fibers increased toughness by 1.7–2.2 times, whereas 2 % fibers enhanced flexural strength retention by up to 10 % after 60 min of exposure. Microstructural analysis confirmed that steel fibers delayed crack propagation and influenced the thermal transformation of gel phases by increasing the silicon-to-aluminum and calcium-to-silicon ratios. These findings highlight the potential of granite waste and steel fibers as sustainable alternatives to natural aggregates and conventional reinforcement for enhancing both fire resistance and mechanical performance in geopolymer concrete.

关键词： Geopolymer concrete Steel fibers Granite waste Post-fire performance Recycled aggregates

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The dimension splitting element-free Galerkin method for 3D transient heat conduction problems

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science China(Physics,mechanics & Astronomy) 2019年第4期62卷 45-56页

作者： ZhiJuan Meng Heng Cheng LiDong Ma YuMin Cheng Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai University School of Applied Science Taiyuan University of Science and Technology Department of Civil Engineering Shanghai University School of Materials Science and Engineering Taiyuan University of Science and Technology

By transforming a 3D problem into some related 2D problems, the dimension splitting element-free Galerkin(DSEFG) method is proposed to solve 3D transient heat conduction problems. The improved element-free Galerkin(IEFG) method is used for 2D transient heat conduction problems, and the finite difference method is applied in the splitting direction. The discretized system equation is obtained based on the Galerkin weak form of 2D problem; the essential boundary conditions are imposed with the penalty method; and the finite difference method is employed in the time domain. Four exemplary problems are chosen to verify the efficiency of the DSEFG method. The numerical solutions show that the efficiency and precision of the DSEFG method are greater than ones of the IEFG method for 3D problems.

关键词： improved element-free Galerkin (IEFG) method dimension splitting method finite difference method dimension splitting element-free Galerkin (DSEFG) method transient heat conduction problem

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A comparative analysis for different finite element types in strain-gradient elasticity simulations performed on Firedrake and FEniCS

arXiv

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arXiv 2024年

作者： Sarar, B. Cagri Yildizdag, M. Erden Fabbrocino, Francesco Abali, B. Emek International Research Center on Mathematics and Mechanics of Complex Systems University of L'Aquila L'Aquila Italy Department of Architecture Design and Urban Planning University of Sassari Alghero07041 Italy Faculty of Naval Architecture and Ocean Engineering Istanbul Technical University Istanbul34469 Turkey Department of Engineering Telematic University Pegaso Napoli80143 Italy Department of Materials Science and Engineering Division of Applied Mechanics Uppsala University Box 35 Uppsala751 03 Sweden

The layer-upon-layer approach in additive manufacturing, open or closed cells in polymeric or metallic foams involve an intrinsic microstructure tailored to the underlying applications. Homogenization of such architectured materials creates metamaterials modeled by higher-gradient models, specifically when the microstructure's characteristic length is comparable to the length scale of the structure. In this study, we conduct a comparative analysis of various finite elements methods for solving problems in strain-gradient elasticity. We employ open-source packages from Firedrake and FEniCS. Different finite element formulations are tested: we implement Lagrange, Argyris, Hermite elements, a Hu-Washizu type (mixed) formulation, as well as isogeometric analysis with Non-Uniform Rational B-Splines (NURBS). For the numerical study, we investigate one- and twodimensional problems discussed in the literature of strain-gradient modeling. All developed codes are open-access to encourage research in Finite Element Method (FEM) based computation of generalized continua. Copyright © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Electrified Fracture of Nanotube Films

arXiv

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arXiv 2023年

作者： Bian, Jinbo Wang, Shijun Yu, Zhaokuan Zhang, Zhong Xu, Zhiping Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing100084 China Center for Nano and Micro Mechanics Tsinghua University Beijing100084 China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing100190 China Department of Physics Zhejiang University Hangzhou310027 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics School of Engineering Science University of Science and Technology of China Hefei230027 China

Strong and conductive carbon nanotube films are ideal candidates for lightning-strike protection. Understanding their failure mechanisms by considering the anisotropic and single-fiber nature is essential to improve performance. Our experimental studies show that the single-layer, nanometer-thick films fail under electrification by crack nucleation and propagation, reminiscent of brittle and ductile fracture of materials under mechanical loads. Sharp and diffuse patterns of fracture are identified in aligned and non-woven films, respectively, signaling the strong effect of material anisotropy that is absent in common engineering materials. The fracture is driven by local Joule heating concentrated at the crack fronts instead of force-induced breakage, which is validated by experimental characterization and simulation results at both continuum and atomistic levels. © 2023, CC BY.

关键词： Brittle fracture

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In Situ Curing Enables High Performance All-Solid-State Lithium Metal Batteries Based on Ultrathin-Layer Solid Electrolytes

SSRN

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SSRN 2023年

作者： He, Linchun Ye, Hualin Sun, Qiaomei Tieu, Aaron Jue Kang Lu, Li Liu, Zishun Adams, Stefan Department of Materials Science and Engineering National University of Singapore 117576 Singapore International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Xi'an Jiaotong University Shaanxi Xi'An710049 China Department of Materials Science and Engineering National University of Singapore 117574 Singapore School of Environmental Science and Engineering Nanjing Technology University Nanjing211816 China Department of Mechanical Engineering National University of Singapore 117575 Singapore National University of Singapore Chongqing Research Institute Chongqing401123 China

All-solid-state lithium metal batteries (ASSLiMB) are regarded as promising next-generation energy storage systems because of their superior energy density and safety. ASSLiMBs relying on rigid solid-state electrolytes (SSE) are however often challenged by large electrode/SSEs interface resistances that limit energy efficiency and rate capability. We synthesize ultrathinlayer SSEs by in situ UV-curing bisphenol A ethoxylate dimethacrylate composites with the ceramic additive Li1.5Al0.5Ge1.5(PO4)3 achieving fast ionic conductivity (1.1×10-4 S·cm-1), wide electrochemical window (up to 5.02 V) and high thermal decomposition temperature (275 °C). Temperature-dependent lithium-ion diffusion paths are analyzed to design optimal composition and microstructure. When cycling a symmetric Li/SSE/Li cell with a high current density of 2 mA·cm-2 over 500 h, the overpotential remains stable and no dendrite growth is observed. In situ-curing a thin layer SSE on a lithium iron phosphate (LFP) composite cathode reduces the SSE/cathode interfacial resistance. An LFP/SSE/Li ASSLiMB yields specific discharge capacity of 147.8 mAh·g-1 and retains 131.9 mAh·g-1 after 200 charge/discharge cycles. Direct observation demonstrates that strong binding of the in situ-cured SSE/cathode interface and three-dimensional architecture of the interface diffusion routes cause the high cycling stability. ASSLiMBs with high mass loading of 6.0 mg·cm-2 were demonstrated to successfully cycle at room temperature. © 2023, The Authors. All rights reserved.

关键词： Solid electrolytes

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Thermodynamics of the Solid-Liquid Phase Equilibrium of a Binary System: Effect of a Chemical Reaction in the Liquid and Epitaxial Strain in the Solid

SSRN

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SSRN 2023年

作者： Deymier, Alix C. Deymier, Pierre Alix Muralidharan, Krishna Latypov, Marat I. Department of Biomedical Engineering UConn Health FarmingtonCT06030 United States Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States Graduate Interdisciplinary Program in Applied Mathematics University of Arizona TucsonAZ85721 United States

We introduce two thermodynamics models of solid-liquid phase equilibrium of a binary system in the presence of (a) a chemical reaction in the liquid involving only one of the binary components and, (b) strain-inducing epitaxial conditions on the solid in addition to the chemical reaction in the liquid. These models show the existence of the counter intuitive behavior that epitaxy may promote recrystallization of the solid in spite of the reaction driving dissolution. The conditions for this recrystallization behavior are determined by the value of the epitaxial lattice matching composition, the temperature and the overall composition of the binary solid-liquid system. © 2023, The Authors. All rights reserved.

关键词： Chemical reactions

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Resonant Raman in Armchair Graphene Nanoribbons from First-Principles

SSRN

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SSRN 2024年

作者： Sheremetyeva, Natalya Lamparski, Michael Liang, Liangbo Barin, Gabriela Borin Meunier, Vincent Department of Engineering Science and Mechanics The Pennsylvania State University State CollegePA16801 United States Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute TroyNY12180 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37830 United States nanotech@surfaces Laboratory Empa Swiss Federal Laboratories for Materials Science and Technology Dübendorf8600 Switzerland

Resonant Raman spectra of armchair graphene nanoribbons (AGNRs) are computed using Density Functional Theory (DFT) and third-order perturbation theory. Results are benchmarked against available experimental data and compared to previously used theoretical approaches based on the Placzek approximation. In addition, a numerical analysis is carried out to provide a justification for the resonant modeling method based on the use of the frequency-dependent dielectric tensor in the Placzek approximation. This work also provides additional predictions and references for wide AGNRs that have not been broadly investigated with Raman scattering experiments to date. © 2024, The Authors. All rights reserved.

关键词： Raman scattering

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Gaussian Process Port-Hamiltonian Systems: Bayesian Learning with Physics Prior

Gaussian Process Port-Hamiltonian Systems: Bayesian Learning...

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IEEE Conference on Decision and Control

作者： Thomas Beckers Jacob Seidman Paris Perdikaris George J. Pappas Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia PA USA graduate program in Applied Mathematics and Computational Science University of Pennsylvania Philadelphia PA USA Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Philadelphia PA USA

ISBN: (数字)9781665467612

ISBN: (纸本)9781665467629

Data-driven approaches achieve remarkable results for the modeling of complex dynamics based on collected data. However, these models often neglect basic physical principles which determine the behavior of any real-world system. This omission is unfavorable in two ways: The models are not as data-efficient as they could be by incorporating physical prior knowledge, and the model itself might not be physically correct. We propose Gaussian Process Port-Hamiltonian systems (GPPHS) as a physics-informed Bayesian learning approach with uncertainty quantification. The Bayesian nature of GP-PHS uses collected data to form a distribution over all possible Hamiltonians instead of a single point estimate. Due to the underlying physics model, a GP-PHS generates passive systems with respect to designated inputs and outputs. Further, the proposed approach preserves the compositional nature of Port-Hamiltonian systems.

关键词： Uncertainty Gaussian processes Probabilistic logic Data models Bayes methods Behavioral sciences Kernel

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Equilibrium Conserving Neural Operators for Super-Resolution Learning

arXiv

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arXiv 2025年

作者： Oommen, Vivek Robertson, Andreas E. Diaz, Daniel Alleman, Coleman Zhang, Zhen Rollett, Anthony D. Karniadakis, George E. Dingreville, Rémi School of Engineering Brown University ProvidenceRI02912 United States Center for Integrated Nanotechnologies Sandia National Laboratories AlbuquerqueNM87185 United States Department of Materials Science and Engineering Carnegie Mellon University PittsburghPA15123 United States Mechanics of Materials Department Sandia National Laboratories LivermoreCA94550 United States Division of Applied Mathematics Brown University ProvidenceRI02912 United States

Neural surrogate solvers can estimate solutions to partial differential equations in physical problems more efficiently than standard numerical methods, but require extensive high-resolution training data. In this paper, we break this limitation;we introduce a framework for super-resolution learning in solid mechanics problems. Our approach allows one to train a high-resolution neural network using only low-resolution data. Our Equilibrium Conserving Operator (ECO) architecture embeds known physics directly into the network to make up for missing high-resolution information during training. We evaluate this ECO-based super-resolution framework that strongly enforces conservation-laws in the predicted solutions on two working examples: embedded pores in a homogenized matrix and randomly textured polycrystalline materials. ECO eliminates the reliance on high-fidelity data and reduces the upfront cost of data collection by two orders of magnitude, offering a robust pathway for resource-efficient surrogate modeling in materials modeling. ECO is readily generalizable to other physics-based problems. © 2025, CC BY.

关键词： Polycrystalline materials

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Numerical and experimental investigation on the residual stresses generated by scanning induction hardening 6th

Numerical and experimental investigation on the residual str...

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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Areitioaurtena, Maialen Segurajauregi, Unai Fisk, Martin Cabello, Mario J. Ukar, Eneko Paseo J.M. Arizmendiarrieta 2 Arrasate-Mondragon20500 Spain Department Of Materials Science And Applied Mathematics Malmö University Malmö Sweden Division Of Solid Mechanics Lund University P.O. Box 118 LundSE-221 00 Sweden Department Of Mechanical Engineering University Of The Basque Country Alameda Urquijo s/n Bilbao48013 Spain

Induction hardening is widely used in the industry as a surface heat treatment that improves the surface and the subsurface hardness of components greatly. The hardened case, which usually is a few mm, highly impacts the surface and structural integrity of the component. In this work, we simulate the scanning induction hardening process by means of finite element modeling. The computed hardness, microstructure, and residual stress profile are compared with experimentally measured data using several surface and subsurface characterization techniques. A very good agreement is found between the simulated and experimentally measured residual stresses, which were characterized by the incremental hole drilling technique. © 2022 The Authors.

关键词： Residual stresses

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