Article
Construction & Building Technology
Pengfei Bian, Meng Zhang, Qijun Yu, Binggen Zhan, Peng Gao, Binglin Guo, Yuyang Chen
Summary: This study investigates the relationship between pores and compressive strength of foamed concrete. The results show that changes in density and water-cement ratio affect porosity and pore size distribution, with lower densities and higher water-cement ratios leading to more larger-sized pores and wider and more nonuniform pore size distributions. Furthermore, the pore structure of lower-density foamed concrete is more susceptible to density and water-cement ratio, resulting in larger size pores. The type of foaming agent also has a significant impact on pore size distribution. Smaller porosity and more concentrated and uniform pore size distribution are found to be beneficial for strength. A new empirical model is proposed to relate porosity, size distribution, and compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Agriculture, Multidisciplinary
Charles Nwaizu, Qiang Zhang
Summary: By comparing experimental data with simulated values, it was found that the CFD model including the compaction effect showed closer agreement with experimental data and higher accuracy in predicting pressure drop.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2021)
Article
Materials Science, Ceramics
Byung-Nam Kim, Koji Morita, Tohru S. Suzuki, Ji-Guang Li, Hideaki Matsubara
Summary: This study modeled and simulated the densification behavior of nano-sized powder in the final sintering stage, showing that the densification rate for size-distributed pores is lower than for single-sized ones. By choosing appropriate pore-size distributions, the experimental relationship between densification rate and porosity can be reproduced effectively. Additionally, the simulation revealed that the sintering stress with densification may increase or decrease depending on the pore size distribution, but is significantly lower than for single-sized pores.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Construction & Building Technology
Jiandong Huang, Yi Zhang, Yuantian Sun, Jiaolong Ren, Zedong Zhao, Junfei Zhang
Summary: This study investigated the pore size distributions and permeability reduction behavior of pervious concrete through laboratory tests. The results showed that while thickness has a negligible effect on permeability, it has a significant impact on clogging behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Song Jin, Jikai Zhou, Xiyao Zhao, Lu Sun
Summary: Cementitious materials have a complex pore structure, with microscale pores having a significant impact on material strength. The influence function shows that the effect of pores on strength increases with pore size, particularly at larger sizes. Microscale pores should be avoided to improve material strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Forestry
Eun-Suk Jang, Chun-Won Kang
Summary: The study classified the porosities of balsa into three types and found that total porosity of balsa is positively correlated with closed-pore porosity and negatively correlated with blind-pore porosity and through-pore porosity. This information is useful in utilizing balsa as a natural porous material.
JOURNAL OF WOOD SCIENCE
(2022)
Article
Geochemistry & Geophysics
Ouyang Fang, Zhao JianGuo, Li Zhi, Xiao ZengJia, He YanXiao, Zhao Hao, Ren Jing
Summary: A method for calculating pore aspect ratio distribution using thought experiment was proposed to improve the classical D-Z pore structure model, resulting in a detailed inversion workflow incorporating four effective medium theories. The proposed method showed better agreement with actual data compared to the D-Z model, and was almost independent of the selection of effective medium theories.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2021)
Article
Astronomy & Astrophysics
Wendy K. Caldwell, Abigail Hunter, Catherine S. Plesko
Summary: Asteroid 16 Psyche, the largest metallic main belt asteroid, is the subject of research to determine its composition and porosity.
Article
Geosciences, Multidisciplinary
John W. Rudnicki
Summary: This study compares the predictions of two expressions for the evolution of porosity in the context of rate and state friction. The simulations show significant differences between the two expressions under different conditions. Additionally, the study suggests that changes in pore pressure have a greater impact on friction stress than rate and state effects.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Lin Yang, Zhengyuan Lu, Xie Tang, Ling Tang, Weiwei Zhang
Summary: The Upper Paleozoic strata in the Ordos Basin are characterized by tight sandstone gas reservoirs with strong heterogeneity and widely distributed aquifers. Traditional mud logging technology faces difficulties in effectively identifying the reservoir and fluid properties. By integrating NMR logging, regional geological characteristics, and gas test results, the reservoirs were classified to effectively identify the reservoir and fluid properties.
Article
Soil Science
Aaron N. Koop, Daniel R. Hirmas, Sharon A. Billings, Li Li, Alejandro Cueva, Xi Zhang, Hang Wen, Attila Nemes, Ligia F. T. Souza, Hoori Ajami, Alejandro N. Flores, Aoesta K. Rudick, Annalise Guthrie, Lola M. Klamm, Micah Unruh, Pamela L. Sullivan
Summary: Climate-induced soil structural changes are occurring rapidly at yearly to decadal timescales, making it important to understand the properties and mechanisms controlling soil structure and macroporosity. This study shows that the complexed fraction of soil organic carbon and clay strongly influence effective porosity in both surface and subsurface horizons. The relationship between effective porosity and complexed organic carbon and clay can help predict future changes in soil hydraulic properties.
Article
Chemistry, Multidisciplinary
San Hae Kim, Yu Ra Choi, Yoon Jeong Cho, Seung Yeon Rhyu, Sang Wook Kang
Summary: Water-channels were created in cellulose acetate by adding polyethylene glycol (PEG) and using water-assisted pressures, allowing for controlled pore formation. PEG, acting as a plasticizer, easily penetrated into polymer chains, creating free volumes and enhancing thermal stability through new interactions with CA chains. Due to the cost-effectiveness and eco-friendliness of PEG and CA, they have the potential for widespread use in battery separator manufacturing.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Olmo Miguez-Salas, Javier Dorador, Francisco J. Rodriguez-Tovar, Fatima Linares
Summary: Micro-CT analysis was used to evaluate the effects of bioturbation on porosity distribution in contourite facies for the first time. Different trace maker behaviors may lead to variable changes in porosity distribution, with Macaronichnus and Chondrites showing significant impacts on porosity values.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Polymer Science
Xiaoshuang Shen, Pan Jiang, Dengkang Guo, Gaiyun Li, Fuxiang Chu, Sheng Yang
Summary: The study investigated the effect of wood impregnation with furfuryl alcohol on its hierarchical porous structure. Results showed that lumina diameters decreased, cell wall thickness increased, and some perforations and pits were occluded. Porosity and pore volume decreased in furfurylated woods compared to untreated wood, with the alterations becoming more remarkable with higher weight percent gain.
Article
Materials Science, Ceramics
Haoran Zou, Xide Li, Chuo Zhang, Bin Li, Yuzuo Liu, Xuejin Yang, Lieqiang Xiong, Xiao Zheng, Junsheng Yang
Summary: The study demonstrated that the Al content has a significant impact on the pore structures of TiVAlC ceramics, as increasing Al content can reduce pore size and viscous permeability coefficients while increasing porosity. However, once the Al content exceeds a certain range, these properties exhibit an opposite trend.
CERAMICS INTERNATIONAL
(2021)