Article
Materials Science, Multidisciplinary
R. Abdul Rahman, P. Forquin
Summary: The study proposes an experimental method to investigate the shear behaviour of concrete under high confinement in static conditions. The experimental tests show that higher confining pressure leads to higher concrete shear strength.
EXPERIMENTAL MECHANICS
(2023)
Article
Construction & Building Technology
Xu-li Lan, Xiao-hui Zeng, Hua-sheng Zhu, Guang-cheng Long, You-jun Xie
Summary: This study investigates the characteristics of pore structure of air-entrained concrete at low atmospheric pressure and standard atmospheric pressure through in situ experiments. The results show that low atmospheric pressure has a significant impact on the fractal properties of pores and pore volume.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Civil
Mohsen K. Khalajestani, Ahsan Parvez, Stephen James Foster, Hamid Valipour, Graeme McGregor
Summary: The demand for high-strength steel in concrete structures is increasing due to its potential benefits. Various design standards are now allowing the use of higher strength steel, but more comprehensive test data is needed to ensure the confident application of high-strength concrete with HSS in columns.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Mechanical
Yin Wang, Xiangzhen Kong, Qin Fang, Li Chen, Junyu Fan
Summary: This study focuses on physically modeling the damage mechanisms in concrete structures under blast and impact loadings, with particular consideration given to high confinement situations. By introducing a new damage model, the interactions between different damage mechanisms are successfully simulated, revealing the physical mechanisms behind the observed dynamic failures in reinforced concrete slabs subjected to explosions and projectile impacts.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Construction & Building Technology
Zhao Wang, Iman Hajirasouliha, Maurizio Guadagnini, Kypros Pilakoutas
Summary: This study investigates the axial behavior of square and circular concrete specimens confined by externally bonded FRP jackets. The research findings show that the confinement effectiveness of Aramid-FRP is better than Carbon-FRP, and the detrimental effect of sharp corners on confinement effectiveness is less critical when using high rubber content. The study suggests the need for more refined confinement models for predicting the behavior of confined rubberized concrete with rectangular cross-section.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Weipei Xue, Xiaochen Mao, Wei Xu, Hanwen Zhang, Cong Gao
Summary: This study investigates the impact dynamic properties and pore structure characteristics of shaft lining concrete after exposure to various water pressure levels and durations. The results show that the impact strength increases when the damage effect induced by microcracks and micropores expansion under water pressure is less than the enhancement benefit under impact dynamic load, and vice versa.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Computer Science, Interdisciplinary Applications
Jian Cui, Xianglong Guan, Yanchao Shi, Zhongxian Li
Summary: This paper proposes a new constitutive model that incorporates the damage caused by hydrostatic pressure into the equations of concrete to predict the high dynamic responses of concrete structures. The model introduces two hydrostatic damage equations to quantify the strength and stiffness degradation, and includes a shrinking failure surface method and a novel unloading/reloading law for the failure criterion and equation of state respectively. Numerical tests and simulations confirm the accuracy of the model in capturing the dynamic responses and damage evolution of concrete.
COMPUTERS & STRUCTURES
(2023)
Article
Construction & Building Technology
Weiguo Shen, Zheng Zhang, Jiangwei Li, Zhenghao Li, Zhongwen Wang, Lianghong Cao, Guocheng Rong, Miaomiao Wu, Deqiang Zhao, Zhicheng Zhao
Summary: This study proposed an innovative mix proportion design method for preparing ecological self-compacting concrete (Eco-SCC) with more coarse aggregates and higher fly ash content to reduce environmental impacts. By optimizing the mix proportion, Eco-SCC achieved better mechanical properties, lower shrinkage ratio, and lower porosity compared to conventional SCC, while requiring less cementitious materials and costing less on raw materials and construction.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Xiaoli Wei, Xiaodan Ren
Summary: The purpose of this paper is to develop a confinement enhanced damage-plasticity model for concrete that can characterize the improvement of strength and ductility under high confining stress. The influence mechanisms of confinement in damage and plasticity sub-space are discussed separately. The proposed models are validated through comparison with experimental results.
MECHANICS OF MATERIALS
(2023)
Article
Construction & Building Technology
Weipei Xue, Linfeng Xu, Zhongjian Wang, Tong Min, Jun Xu
Summary: This study investigates the effects of service loading and dry-wet-freeze-thaw environments on the initial damage of concrete by conducting permeability testing and microscopic characterization under varying confining pressure. The results show that permeability exhibits nonlinear characteristics during the loading and unloading process. The initial permeability increases with increasing load level and the number of dry-wet-freeze-thaw cycles. The study also reveals the evolution pattern and mechanism of specimen permeability using various analysis techniques.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Yunmin Chen, Shengnan Ma, Yu Ren, Renpeng Chen, Xuecheng Bian
Summary: The study investigated the behavior of piles in soft soils under combined monotonic and cyclic loading through model tests, identifying the ratio of cyclic load to ultimate bearing capacity and the ratio of monotonic load to ultimate bearing capacity as key factors influencing pile settlement. A chart was proposed to distinguish settlement trends based on these ratios, and an analytical model was developed to predict cyclic pile settlement under large cyclic loads. The study also demonstrated the application of these findings in the design of piled embankments for high-speed railways.
TRANSPORTATION GEOTECHNICS
(2021)
Article
Construction & Building Technology
Aref A. Abadel, M. Iqbal Khan, Radhouane Masmoudi
Summary: This study conducted numerical and experimental investigations on the compressive behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) columns under various confinement materials. The results showed that the outer steel tube had the best confinement effect on the core concrete, and all proposed confinement schemes significantly improved the ductility and energy absorption of the columns.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Wisam A. Aules, Yasir M. Saeed, Hosam Al-Azzawi, Franz N. Rad
Summary: This study investigates the use of ferrocement in strengthening RC structures, particularly in combination with CFRP confinement. The results show that the combination of ferrocement and CFRP is highly effective, improving lateral stress distribution and reducing stress concentration.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Thermodynamics
J. Juarez Trujillo, J. A. Castro, M. D. M. Innocentini, F. Vernilli
Summary: Explosive spalling is a major concern during the drying of refractory concretes. Empirically defined over-estimated slow heat-up curves are used in industry for safety purposes. Polypropylene fibers can reduce spalling, but they are not suitable for certain castables due to deterioration of properties. There is currently no widely accepted methodology or mathematical model for predicting spalling phenomena in monolithic refractories.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Petroleum
Zhi Zhang, Baojiang Sun, Zhiyuan Wang, Shaowei Pan, Wenqiang Lou, Dalin Sun
Summary: The exploration and development of offshore oil and gas have eased global oil and gas resource tension. Offshore reservoirs commonly have abnormal pressure, complex geological structures, and uncertainties in pressure system changes. Utilizing a method based on multisource information can reduce uncertainty in formation pressure prediction.
Article
Engineering, Civil
Z. Kammouna, M. Briffaut, Y. Malecot
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2019)
Article
Construction & Building Technology
L. Missemer, E. Ouedraogo, Y. Malecot, C. Clergue, D. Rogat
CEMENT AND CONCRETE RESEARCH
(2019)
Article
Mechanics
Olga Stamati, Emmanuel Roubin, Edward Ando, Yann Malecot
Article
Construction & Building Technology
Zainab Kammouna, Matthieu Briffaut, Yann Malecot
ADVANCES IN CIVIL ENGINEERING
(2019)
Article
Mathematics, Interdisciplinary Applications
Hicham Benniou, Abdallah Accary, Yann Malecot, Matthieu Briffaut, Laurent Daudeville
Summary: The discrete element model proposed in this paper addresses the macroscopic behavior of concrete while taking into account the presence of free water in pores. This new constitutive model considers the influence of saturation ratio on triaxial compressive stresses in concrete structures subjected to severe loading. By introducing a dependency between water saturation ratio and inelastic deformation due to pore closure, the model aims to model cracking and compaction at the interaction level between discrete elements.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Engineering, Mechanical
J. Baroth, M. Briffaut, D. Vu, Y. Malecot, L. Daudeville
Summary: This paper presents analytical and finite element models for predicting perforation of reinforced concrete slabs under impacts. The finite element simulations and analytical predictions are consistent with experimental tests.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Chemistry, Physical
Alejandro Ortega Laborin, Emmanuel Roubin, Yann Malecot, Laurent Daudeville
Summary: This paper conducts an in-depth study on the theoretical basis of strong discontinuity methods for local fracture simulations using the Embedded Finite Element Method (E-FEM). A new proposal of strong discontinuity enhancement functions is presented, improving basic kinematic coherence and robustness of E-FEM techniques for fracture simulations. Simulation results demonstrate increased robustness and potential for higher level application of E-FEM techniques.
Article
Construction & Building Technology
A. Ortega, E. Roubin, Y. Malecot, L. Daudeville
Summary: This paper investigates the application of the Embedded Finite Element Method (E-FEM) in the numerical modeling of triaxial fracture processes in non-homogeneous quasi-brittle materials. The E-FEM framework combines weak and strong discontinuities to account for material heterogeneity and represent local fractures. The enriched fracture kinematics of the strong discontinuity allows modeling of all typical fracture modes in three dimensions. The paper reviews previous work using similar enriched finite element frameworks, establishes the theoretical basis of each discontinuity formulation, and presents numerical simulations to evaluate the performance of the combined E-FEM model.
MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Shadi Youssef, Abdallah Accary, Christophe Dano, Yann Malecot
Summary: This study investigates the mechanical behavior of siliceous and calcareous sand materials under high stress levels. The results show that particle breakage is enhanced by the presence of water, smaller particles in siliceous sand are more prone to breakage, and calcareous grains exhibit a faster response to axial stress. Testing various soil properties has the potential to better characterize soil fragility.
Article
Computer Science, Interdisciplinary Applications
A. Ortega, E. Roubin, Y. Malecot, L. Daudeville
Summary: This paper analyzes the application of the Embedded Finite Element Method (E-FEM) in simulating local material heterogeneities. It discusses the evolution of weak discontinuity models within the E-FEM framework and establishes a theoretical basis for enhancing weak discontinuities. The paper introduces two enhancement functions and evaluates their performance through numerical simulations.
COMPUTERS & STRUCTURES
(2022)
Article
Mathematics, Interdisciplinary Applications
Abdallah Accary, Hicham Benniou, Yann Malecot, Matthieu Briffaut, Laurent Daudeville
Summary: This paper investigates the influence of saturation ratio on perforation and penetration of concrete by simulating the impact of ogive-nosed steel projectile on plain concrete targets surrounded by steel jackets.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Construction & Building Technology
Santosh Yadav, Yannick Sieffert, Florent Vieux-Champagne, Laurent Debove, Damien Decret, Yann Malecot, Philippe Garnier
Summary: This paper explains the steps for the preparation and execution of shake table tests and showcases its advantages and applicability.
