Article
Construction & Building Technology
Xu Gong, Hongfa Yu, Chengyou Wu
Summary: The damage form, stress-strain relationship, quasi-static mechanics performance, and deformation performance of concrete under freezing-thawing cycles were studied. It was found that freezing-thawing cycles caused severe damage to concrete but also increased its ductility. A linear relationship model was established to accurately describe the mechanical behavior of concrete under freezing-thawing cycles.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mechanics
Minjiao Zhang, Hongfa Yu, Jinhua Zhang, Boyu Chen, Haiyan Ma, Xu Gong, Jianbo Guo, Weimin Yu, Lingyu Li
Summary: The uniaxial compression behavior of concrete before and after freeze-thaw cycles was studied through experimental and numerical simulation. A three-dimensional mesoscopic model considering the random shape and size of aggregate was established. The reliability of the model was verified by comparing the failure mechanism, failure pattern, and stress-strain curve of concrete. A unified constitutive model considering freeze-thaw damage variables was established, which can better reflect the continuous change law of concrete stress-strain relationship during freeze-thaw process. This work provides a reference for future study of concrete freeze-thaw damage using numerical simulation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Lu Ren, Lun-Yang Zhao, Fu -Jun Niu
Summary: In cold regions, the combined action of freeze-thaw cycling and loading has a significant impact on the stability of engineering structures. This study proposes a physically-based elastoplastic damage model for quasi-brittle geomaterials under freeze-thaw cycles and loading within the framework of irreversible thermodynamics. The model describes the entire deformation and failure process of the material and introduces a new nonlinear evolution law of freeze-thaw damage based on micro-mechanics.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Environmental
Wangtao Jiang, Yuanming Lai, Fan Yu, Qinguo Ma, Haiqiang Jiang
Summary: This paper conducted uniaxial compression tests on red sandstones under different numbers of freeze-thaw cycles (FTCs), and established the relationships between mechanical parameters and the number of FTCs. The method for determining the fully compacted point was proposed, and a new damage constitutive model simulating the whole deformation process of rock subjected to FTCs was proposed. The proposed model showed better consistency with experimental data compared to the existing models, and the two existing models can be improved to be more versatile. This finding enriches the research of rock in constitutive modeling in cold regions.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Yu Wang, Juzhou Li, Chun Zhu, Tianqiao Mao
Summary: Increasing freeze-thaw cycles and loading levels accelerate rock damage, with higher freeze-thaw cycles resulting in greater damage. The warning strength is defined based on volumetric strain rate and dissipated energy rate, providing early warning before crack damage occurs. Monitoring incremental rates of radial strain and volumetric strain can help predict rock instability precursors.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Construction & Building Technology
Shaojie Chen, Jianxi Ren, Lang Liu, Lei Wang, Yugen Li, Xiang Ren
Summary: The objective of this study is to investigate the dynamic compressive mechanical properties of concrete under the combined effects of freeze-thaw and salt erosion. The research findings suggest that the dynamic compressive strength of concrete is influenced by strain rate, freeze-thaw cycles, and chloride concentration. A constitutive model considering rate-dependency was developed to describe its compressive mechanical response. The experimental results demonstrate that the proposed model effectively captures the mechanical response of concrete subjected to the combined influence of freeze-thaw and salt erosion.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Lei Gan, Yuan Liu, Zongliang Zhang, Jun Liu, Hongjie Jin, Yiqing Sun
Summary: The mechanical properties of concrete in cold regions are significantly affected by low temperature and freeze-thaw cycles. Low temperature conditions can improve the compactness and compressive strength of concrete, while reducing the rate sensitivity of its mechanical properties. Different levels of freeze-thaw damage in concrete show decreasing gaps in mechanical properties under low temperature.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Geological
Lifeng Fan, Yiding Fan, Yan Xi, Jingwei Gao
Summary: In this study, we investigated the spatially distributed damage in sandstone samples under coupled stress-freeze-thaw conditions. Uniaxial compressive stresses were applied to the samples, and then freeze-thaw cycles were performed to realize the coupling. Real-time CT scanning was conducted to observe the induced damage, and total porosity was used to evaluate the damage degree. The analysis showed that porosity and damage increased with the number of freeze-thaw cycles, and the damage exhibited a spatial gradient distribution.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Junce Xu, Hai Pu, Ziheng Sha
Summary: This study investigated the effect of freeze-thaw (F-T) weathering on sandstone in the Urumqi area in China. The results showed that parameters such as P-wave velocity, elastic modulus, and peak stress were negatively correlated with F-T damage, while porosity showed a positive correlation. The elastic modulus was the most sensitive parameter to F-T action. The stress thresholds for crack development and initiation decreased with increasing F-T damage. Additionally, the macro-cracks damage zone of the samples increased with F-T damage.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Yash Agrawal, Trilok Gupta, Salman Siddique, Ravi Kumar Sharma, Narayan Lal Panwar
Summary: The performance of dolomite mining residues as a substitute for fine aggregate in concrete was examined and found to have a certain impact on concrete properties at a certain proportion, but the effect was small when the content of dolomite mining residues did not exceed 10%. The study suggests that up to 10% of dolomite production waste can be used as a sand substitute in concrete and other applications.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Construction & Building Technology
Wei Wei, Yusui Bi, Gehua Bi
Summary: The viscoelastic properties of polyurethane under freeze-thaw cycles were investigated using experimental tests and molecular simulations. The study found that freeze-thaw cycles increased the modulus and reduced the roughness and adhesion of polyurethane. The research provides a theoretical foundation for improving the resilience of polyurethane materials in various industries where freeze-thaw cycles exist.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Chemistry, Physical
Jianwei Yue, Can Ma, Limin Zhao, Qingmei Kong, Xiangchun Xu, Zifa Wang, Ying Chen
Summary: This study investigates the effects of moisture content and freeze-thaw cycles on the quality, mechanical properties, and microstructure of gray bricks. The results provide insights into the damage mechanism and thermal stress distribution, which can contribute to the prevention and protection of frost damage in brick buildings.
Article
Materials Science, Multidisciplinary
Zhang-qing Xuan, Zhi-min Sun, Jun-guang Wang, Wei-ji Sun, Bing Liang, Zheng Ma
Summary: This study investigates the mesoscopic damage and creep evolution characteristics of rock through freeze-thaw cycle experiments, nuclear magnetic resonance, and triaxial compression creep experiments. A nonlinear fractional damage creep model considering the number of cycles and temperature difference is proposed. The experimental results show significant effects of the number of cycles and freezing temperature on the creep deformation and steady-state creep rate of shale.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Mechanics
Shumin Liu, Haitao Sun, Dongming Zhang, Kun Yang, Dengke Wang, Xuelong Li, Kun Long, Yaning Li
Summary: Liquid nitrogen cold soaking is an innovative technology for stimulating coalbed methane, which can increase the permeability of coal seam by producing more fractures in the coal body. This study conducted nuclear magnetic resonance tests on coal samples treated with liquid nitrogen cold soaking and investigated its influence on the pore structures of coal. The results showed that liquid nitrogen cold soaking improved pore connectivity and increased the size and number of coal pore structures. The porosity and permeability of coal samples increased with the number of liquid nitrogen cold soaking cycles.
Article
Engineering, Geological
Feng Gao, Xin Xiong, Chaoshui Xu, Keping Zhou
Summary: The study investigates the stress-strain relationships of rocks subjected to different numbers of freeze-thaw cycles, revealing that with increasing cycles, the rock's strength decreases while strain increases. A new piecewise constitutive model is proposed, based on the characteristics of compaction and post-compaction stages of the stress-strain curve, which proves to be more effective in describing the stress-strain behavior of rocks with freeze-thaw damages compared to the reference model.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)