Article
Engineering, Geological
Charles Wang Wai Ng, Daniel Peprah-Manu
Summary: This study evaluated the effects of pore structure on water retention behavior for specimens prepared at different pore structures. The results showed that loosely compacted specimens prepared on the wet side have a lower water retention ability and a significantly higher degree of hysteresis. Increasing compaction density improves water retention ability but reduces the number of cycles needed for equilibrium.
ENGINEERING GEOLOGY
(2023)
Article
Construction & Building Technology
Jinjun Guo, Xing Xia, Kun Wang, Yaoqun Xu
Summary: To explore the transport mechanism of sulfate in concrete under alternate dry-wet conditions, a multi-scale analysis method was proposed. The macroscopic sulfate transport was represented by a model considering convection, diffusion of moisture and sulfate. The relationship between pore characteristics and microscopic diffusion behavior was investigated. The model was validated by experimental results, revealing the correlation between diffusion behavior and pore structure. Sensitivity analysis showed the model's sensitivity to dry-wet ratio and diffusion coefficients. The findings contribute to refining the understanding of sulfate transport under drying-wetting cycles through combining experimental and numerical methods in a multi-scale range.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Chemistry, Physical
Yuqiang Mao, Wencheng Xia, Guangyuan Xie, Yaoli Peng
Summary: This study investigates the impact of liquid surface tension on dynamic pore wetting of porous materials through experiments and quantitative models. The results indicate that lower surface tension leads to higher pore wetting percentage in hydrophobic materials, and there is a certain pattern in the wetting processes of pores of different sizes.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Mechanics
Zhanming Shi, Jiangteng Li, Yuan Zhao
Summary: A constitutive model for damage of sandstone under the coupled effects of wetting-drying cycles and cyclic loading is proposed in this study, which reflects the stress-strain relationship and damage evolution of sandstone more accurately compared with existing models. The model is derived from statistical mechanics theory and validated through analysis of microscopic force field and calculations of the damage variable.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Chemical
Wencheng Xia, Yuqiang Mao, Guangyuan Xie, Yaoli Peng
Summary: This study investigated the role of NaOL solution in the in-situ wetting process of pores of porous active carbon. The results showed that increasing NaOL concentration led to a decrease in pore wetting percentage, with the variation trend from fast to slow. High concentration of NaOL solution significantly improved the hydrophobicity of the sample and prevented the pore wetting process.
Article
Engineering, Geological
Xihui Jiang, Changdong Li, Jia-Qing Zhou, Zihan Zhang, Wenmin Yao, Wenqiang Chen, Hong-Bin Liu
Summary: This study investigates the impact of salt solution on the structure damage and permeability evolution of sandstone under wetting-drying cycles. The results show that the salt solution significantly affects the physical properties of the sandstone, causing surface peeling and internal cracking. The permeability of the sandstone decreases initially due to blocked seepage channels before gradually increasing and reaching a rapid growth after a certain number of cycles. The mechanisms of deterioration are linked to salt crystallization and pressure exerted on narrow pores. The findings contribute to a better understanding of salt-induced rock deterioration and its implications for rock engineering safety and geological hazard forecast.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Energy & Fuels
Yuebing Zhang, Quangui Li, Qianting Hu, Cheng Zhai, Mingyang Song, Jizhao Xu, Yize Deng, Peng Liu, Yong Sun, Jialin Shi, Liangping Hu
Summary: Understanding the wetting process in porous media is crucial for determining fluid behavior and developing natural gas reservoirs. This study developed a low-field nuclear magnetic resonance (LF-NMR) experimental method to characterize the actual wetting process of coals and analyzed the role of surface contact angle. The results showed that the wetting process can be divided into three phases, and the wetting pore size distribution and equivalent wetting pore size were quantified.
Article
Green & Sustainable Science & Technology
Shukai Cheng, Ziyang Wu, Qiaoyun Wu, Xuyong Chen, Zhonghe Shui, Jian- Xin Lu
Summary: Seawater with corrosive ions can cause severe concrete corrosion, but adding supplementary cementitious materials can improve its corrosion resistance. This study investigated the effects of different synthetic multi-ions solutions and drying-wetting cycles on the degradation mechanisms of concrete. It was found that solutions containing sulfate and magnesium ions accelerated the deterioration of mortar samples.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Shaojie Chen, Jianxi Ren, Xiang Ren, Yugen Li
Summary: This study investigates the deterioration laws of concrete durability under the coupling action of salt erosion and drying-wetting cycles. The experimental results show that the mass loss rate of concrete, as well as the relative dynamic modulus of elasticity and compressive strength, decrease first and then increase with the action of salt erosion and drying-wetting cycles. The porosity and pore quantity fluctuation also increase. The damage degree of concrete induced by drying-wetting cycles is arranged as MgSO4 > Na2SO4 > NaCl.
FRONTIERS IN MATERIALS
(2022)
Review
Mining & Mineral Processing
Yuqiang Mao, Wencheng Xia, Yaoli Peng, Guangyuan Xie
Summary: Dynamic pore wetting plays a crucial role in the flotation of porous particles. This review discusses the characterization methods for dynamic pore wetting and introduces regulation techniques to reduce wetting percentage and improve flotation performance.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Soil Science
Lu Liu, Wenjuan Shi, Jiaping Liang, Ying Yuan, Qiaoge Hao
Summary: Soils are influenced by irrigation and seasonal climate cycles, which affect soil pore structure and aggregate stability. This study examined the impact of gamma-PGA on soil structure under wetting-drying cycles and found that gamma-PGA improved soil aggregate stability. The study also revealed the relationship between pore characteristics and aggregate stability using structural equation modelling.
EUROPEAN JOURNAL OF SOIL SCIENCE
(2023)
Article
Construction & Building Technology
Yang Song, Qier Wu, Franck Agostini, Frederic Skoczylas, Xavier Bourbon
Summary: The study investigated the concrete shrinkage and creep under variable hydric conditions through a long-term experiment, and found that the final mass and strain of concrete were not deeply modified by introducing a rewetting phase.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Energy & Fuels
Youlin Xu, Xuelong Li, Xukun Wu, Wei Zheng, Bo Zhou, Jing Tong
Summary: This study conducted an experimental study on fractured rock mass using low-field nuclear magnetic resonance technology to reveal the fluid seepage characteristics and changes in pore structure under different loading conditions. During water flooding, there were differences in water content and porosity in different locations of fractured sandstone, and with higher flow rates, the water flooding time was shorter and the fluid sweep area was more concentrated.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Haiman Wang, Wankui Ni, Kangze Yuan, Yongpeng Nie, Lan Li
Summary: Landslides and ground subsidence caused by changes in soil-water characteristics during drying and wetting cycles pose a serious threat to the environment and human life in China's Loess Plateau region. This study investigated the evolution mechanism of the soil-water characteristic curve (SWCC) during drying and wetting cycles on compacted loess with different dry densities. The results revealed that the dry density influenced the SWCC, with increased dry density resulting in a decrease in saturated water content and SWCC slope, and an increase in air entry value. The study also found that drying-wetting cycles increased the aggregated volume and macropore diameter, and their effect on SWCC intensified with dry density. Additionally, the researchers proposed a method to calculate surface relaxivity and applied the Weibull distribution function to accurately predict pore size distribution. These findings have practical implications for the construction and protection of loess engineering in the Loess Plateau region.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Geological
Yingchao Gao, Shu Jiang, Jiahai Xie, Wei Wei, Qinghui Jiang
Summary: Multi-stage shear creep experiments were conducted to investigate the shear creep characteristics of joints under wetting-drying cycles. The investigation revealed that increasing wetting-drying cycles led to a porous and disintegrated microstructure of joints, resulting in increased shear deformation and steady-creep rate, and decreased failure strength and long-term strength. A new fractional-order damage creep model of joints considering wetting-drying cycles was proposed based on the experimental results.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
