Article
Mathematics, Interdisciplinary Applications
Jiaming Zhang, Min Yu, Xihua Chu
Summary: A coupled hygro-thermo-mechanical peridynamic model is proposed for concrete at high temperatures, which has been validated through two numerical examples.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Construction & Building Technology
Nv Han, Jianzhuang Xiao, Lihai Zhang, Yu Peng
Summary: This study developed a microscale numerical model to analyze the coupled hygro-thermomechanical behavior of 3D printed concrete specimens at elevated temperatures. The results showed differences in porosity, compactness, and pore diameter between 3DPC and MC specimens, as well as failure forms under elevated temperatures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
J. C. Monge, J. L. Mantari, R. A. Arciniega
Summary: This paper investigates the three-dimensional bending solution of doubly-curved shells subjected to mechanical, thermal, and hygrothermal loads. The temperature profile through the shell is modeled using Fourier's heat conduction equation, while the hygro-thermal profile is determined using Fick's moisture diffusion law. The governing equations are solved using Navier closed form summations, and the thickness profile is discretized using Legendre's grid distribution and solved using the Differential Quadrature Method (DQM). Results for cylindrical, spherical panels, and rectangular plates are presented and compared with existing solutions in the literature.
ENGINEERING STRUCTURES
(2022)
Article
Construction & Building Technology
Jakub Vesely, Vit Smilauer
Summary: This article presents a new 3D hygro-thermo-mechanical model for a single concrete pavement slab, aiming to capture its behavior from casting to long-term drying. The model was calibrated and validated using strain and temperature data from a five-year continuous monitoring system. Four simulated scenarios were conducted to analyze the temperature effects, stress/strain response for traffic load, and long-term drying. The results show that slab drying, in combination with temperature and traffic effects, leads to the highest principal tensile stress on the surface and induces surface cracking.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Liuyu Zhang, Long Wang, Di Mo
Summary: A coupled hygro-thermo-mechanical fiber beam model was developed to analyze the complex behavior of reinforced concrete. The model was verified using experimental data and compared with a conventional model, showing good results. The model considers important features such as non-uniform aging, creep, shrinkage, thermal dilation.
Article
Construction & Building Technology
Ke Gong, Chengjian Liu, Mingsi Yang, Feixiong Mao, Jinquan Wang, Xiang Shen, Long Xiao, Minghui Li
Summary: This study investigated the multivariable interaction of carbonation, Cl-, SO42-, and temperature on the corrosion behavior of reinforcement in a simulated concrete pore solution. Through experimental design and analysis techniques such as XPS and EDS, it was found that carbonation had the most significant impact on electrochemical corrosion. There was also a significant interaction between carbonation and Cl-, leading to an increase in the density of defects in the passivation film. After the chloride ions broke the passivation film, SO42- participated in the pit evolution process, promoting local acidification inside the pit and accelerating electrochemical corrosion.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Yang Yang, Ting Dai, Hong-Liang Dai
Summary: The research on graphene nanolayers has significant theoretical and practical implications for the application of advanced composite materials in engineering. This study investigates the mechanical properties of FG-GNPRC annular plates with voids in hot and humid environments by considering the aggregation effect and type of graphene nanoplatelets (GNPs), as well as the random and gradient distribution patterns of GNPs. The study establishes a mechanical model and examines the effects of various factors on the hygro-thermo-mechanical response of porous FG-GRC annular plates.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Donglai Liu, Hailong Chen
Summary: This paper presents a nonlocal discrete approach for numerical modeling the thermo-hygro-mechanical coupling of cross-ply laminate composites. The material domain is modeled as an assembly of material particles that interact nonlocally via bonds. The orthotropy of material properties is modeled using rotation of discretization lattice. The interface and its effect on the material response are investigated. Numerical verification shows excellent accuracy of the developed model.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Liming Zhou, Bin Nie, Shuhui Ren, Krzysztof Kamil Zur, Jinseok Kim
Summary: This paper analyzed piezoelectric beams under mull-physical hygro-thermo-electromechanical coupling for the first time using NS-RPIM and GS-Galerkin weak formulation. It investigated static and dynamic responses under different hygrothermal conditions and discussed the effects of damping ratios and hygrothermal parameters on the generalized displacements and natural frequencies. The proposed method demonstrated high accuracy and excellent convergence rate, making it suitable for future studies on coupled mull-physical problems and complex piezoelectric sensors and actuators in a hygrothermal environment.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Haitao Zhao, Kaidi Jiang, Bin Hong, Rui Yang, Wen Xu, Qian Tian, Jiaping Liu
Summary: The study shows that high-performance concrete is prone to early-age cracking due to sharp changes in temperature and relative humidity. Applying compressive stress leads to a sudden increase in humidity, while unloading compressive stress results in a sudden decrease. Additionally, a coupled hygro-thermo-chemo-mechanical model has been proposed to describe the behavior of early-age concrete.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Rafael Ramirez, Bahman Ghiassi, Paloma Pineda, Paulo B. Lourenco
Summary: This paper presents a numerical methodology for analyzing the hygro-thermo-mechanical behavior of masonry structures. The methodology can assess the performance of masonry walls under various environmental loads and can also study the compatibility between masonry units and mortars.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Yezhen Yuan, Kaimin Niu, Bo Tian, Lihui Li, Jianrui Ji, Yunxia Feng
Summary: This paper investigates the effects of carbonation, sulfate, and chloride salts on the properties of cement concrete incorporated with metakaolin in a marine environment. The results show that carbonation improves mortar strength and impermeability, while sulfate reduces strength and increases ion migration coefficient. When all three factors were combined, damage to strength and pore structure was significant, but adding 30% metakaolin improved strength and densified the microstructure.
Article
Engineering, Multidisciplinary
Panpan Cheng, Hehua Zhu, Yiming Zhang, Yang Jiao, Jacob Fish
Summary: This paper aims to develop a coupled thermo-hydro-mechanical-phase field model to investigate the mechanism of fire-induced spalling in concrete. The phase field method is used for crack modeling, and the effects of length scale parameter, solution methods, and fracture on mechanical fields, mass transfer, and heat conduction are studied. The study concludes that thermal expansion and vapor pressure are significant factors in spalling.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Naoya Arakawa, Kenji Yonemitsu
Summary: This study proposes a method for controlling the exchange interactions of Mott insulators with strong spin-orbit coupling. By analyzing a theoretical model, it demonstrates that the magnitudes and signs of three exchange interactions can be changed simultaneously, and shows that the Heisenberg interaction can be much smaller than the anisotropic exchange interactions under different parameter settings.
Article
Construction & Building Technology
Dingshi Chen, Shuo Liu, Jiyang Shen, Guorui Sun, Jun Shi
Summary: In this study, the influence of freeze-thaw (F-T) cycles and sustained loads on the carbonation resistance of concrete in cold areas was investigated. Experimental results showed that both F-T cycles and sustained loads have a significant impact on concrete carbonation. A theoretical carbonation model considering the coupling effect of F-T cycles and sustained loads was established, which exhibited high accuracy in predicting the carbonation depth of concrete under these conditions.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Yao Luan, Tetsuya Ishida
Summary: A multi-scale approach is proposed for numerical simulation of capillary absorption of cracked SHCC by considering detailed crack patterns, showing consistent results with previous studies and significant water penetration at crack zones with non-uniform crack widths and locations. Other factors such as relative humidity, specimen height, water-to-binder ratio, and fiber content are also discussed in the analysis.
MATERIALS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Tatsuya Nukushina, Yuya Takahashi, Tetsuya Ishida
Summary: This study developed a method to reasonably predict the chloride ingress into concrete under unsaturated conditions by considering the pore connectivity and the liquid water connectivity. The numerical analytical system investigated and modeled the connectivity of both the pore networks and the water paths in hardened cement paste. This work provides a more realistic reproduction of chloride penetration into unsaturated concrete, including an airborne chloride environment, by calculating the chloride transport under unsaturated conditions.
JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Tsukasa Mizutani, Takahiro Yamaguchi, Tomoshi Kudo, Kazutomo Yamamoto, Tetsuya Ishida, Yoshifumi Nagata, Hinari Kawamura, Tomoaki Tokuno, Kiyoshi Suzuki, Yuuya Yamaguchi
Summary: An algorithm for automatic and quantitative evaluation of peeling and delamination on infrastructure surfaces using laser 3D point cloud data is proposed in this article, involving 1D signal processing and 2D image processing. The algorithm was validated with experimental tunnel and road surface data, demonstrating the accurate and efficient detection of problems and estimation of depths for peeling and potholes.
AUTOMATION IN CONSTRUCTION
(2022)
Review
Engineering, Environmental
Lan-Ping Qian, Ling-Yu Xu, Yazan Alrefaei, Tiao Wang, Tetsuya Ishida, Jian-Guo Dai
Summary: This article provides a comprehensive review of the manufacturing process and engineering properties of two types of artificial aggregates, as well as their applications in concrete and future development prospects and challenges.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Construction & Building Technology
Go Igarashi, Mamoru Ichimiya, Fumito Ohya, Tetsuya Ishida
Summary: This paper evaluates the dimensional stability during yard storage of precast concrete with fly ash for a large-scale precast segmental bridge using a multi-scale integrated chemo-hygric computational system. It demonstrates the sensitivity to deformation behavior under different climatic conditions and proposes a method to improve the reproducibility of concrete segments.
JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Motohiro Ohno, Pakpoom Limtong, Tetsuya Ishida
Summary: This paper introduces coupled multiscale models of steel corrosion in concrete, focusing on micropore connectivity. The model validation shows that the exponential change of corrosion current under ohmic control and simulation of oxygen diffusion control are reasonable. A parametric study suggests that moisture in nm-scale micropores does not participate in corrosion reactions. Long-term simulations indicate significant effects of external RH on steel weight loss.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Mika Suzuki, Tetsuya Ishida
Summary: This study aims to develop a prediction method for the durability of reinforced concrete against salt attacks by investigating the effects of concrete composition and water content on resistivity and modeling resistivity for different aggregate volume fractions. It is now possible to predict the corrosion risk and assess the corrosion resisting effect of using blast furnace slag as a mineral admixture.
JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Sun-Jin Han, Tetsuya Ishida, Satoshi Tsuchiya
Summary: In this study, the effects of corrosion in tensile reinforcement on the shear performance of reinforced concrete members were investigated using finite element analysis. A computational system was adopted and validated by comparing the analysis results with shear test results. The findings showed that the reduction in shear strength due to corrosion decreases with the shear span-to-depth ratio when the reinforcement is simply anchored, and when fully anchored, the shear strength increases despite the occurrence of splitting cracks caused by corrosion.
JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Mayank Gupta, Kolneath Pen, Go Igarashi, Yuya Takahashi, Tetsuya Ishida
Summary: Expansive additives in higher dosages induce higher early-age expansion in concrete by chemical prestress. The induced stress and concrete expansion can vary significantly depending on different restraint conditions and can be highly anisotropic. Experimental studies have shown that higher degrees of restraint result in substantial decrease in longitudinal expansion, while the expansion in the stress-free direction is not affected much by the restraint in the other direction. Overall volumetric expansion decreases with an increase in reinforcement ratios. Stress induced in concrete due to restraint expansion in the longitudinal direction is higher for a higher reinforcement ratio. The data provided from this study can be used for comprehensive modeling of expansive concrete under external restraints.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Geunho Lee, Kouki Ogata, Chunhe Li
Summary: This paper introduces a constant balance scheme for crawler-based transportation systems by designing a variable-shape crawler robot with foldable legs to adapt to different ground conditions. The coordination of leg movements allows the robot to maintain a balanced posture while traveling.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Engineering, Civil
Sun-Jin Han, Tetsuya Ishida, Satoshi Tsuchiya
Summary: This study investigates the effects of steel corrosion on the long-term structural behavior of underground reinforced concrete (RC) culverts using a multiscale computational model. Finite element analysis is conducted to validate the model's evaluation of the structural performance of corroded RC members. Numerical simulations are then performed on various corrosion scenarios of actual underground RC culverts. The comprehensive analyses reveal that corrosion rate and volumetric expansion ratio of corrosion products significantly affect the deterioration process and structural damage. The corrosion condition of the reinforcing bars, depending on the surrounding environments, greatly influences the long-term structural behavior of RC culverts. Therefore, attention should be given to environmental conditions and corrosion amounts for lifetime prediction and long-term performance evaluation.
Article
Engineering, Industrial
Tiao Wang, Chunhe Li, Jian-jun Zheng, Jurgen Hackl, Yao Luan, Tetsuya Ishida, Satya Medepalli
Summary: This study presents a stochastic model that combines the degradation effects of crack development and corrosion progression to estimate the probability of failure of reinforced concrete structures over time. Numerical experiments show that the probability of corrosion failure is significantly underestimated if the coupled degradation effect of cracks and corrosion is not considered. Parameter analysis is used to identify the effects of individual parameters on the probability of corrosion failure of RC beams over time, including external load level, supplementary cementitious materials, and environmental temperature.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Construction & Building Technology
Motohiro Ohno, Maxime Pierre, Koichi Imagawa, Tetsuya Ishida
Summary: This paper presents a novel framework for simulation and learning-driven design of Architected Cement-based Materials (ACMs). Two design approaches, random generative design and reinforcement learning-driven design, were proposed. Experimental validation confirmed the potential of this framework for systematic design of ACMs.
JOURNAL OF BUILDING ENGINEERING
(2023)
Proceedings Paper
Construction & Building Technology
N. Sakakibara, Y. Tanaka, I. Iwaki, Y. Koda, K. Sato, T. Ishida
Summary: In order to enhance the durability of RC road bridge decks, multiple defense concepts were introduced during the construction process, including anti-rust coating rebar and high durability concrete to resist salt damage, freezing damage, and ASR. The use of fly ash is essential for high durability concrete, while long-term wet-curing and higher air content were also crucial for achieving the desired performance and resistance against chloride ingress and frost damage.
BRIDGE MAINTENANCE, SAFETY, MANAGEMENT, LIFE-CYCLE SUSTAINABILITY AND INNOVATIONS
(2021)
