DOI: 10.1073/pnas.1919337117
论文题名: Unsaturated nanoporomechanics
作者: Nguyen H. ; Rahimi-Aghdam S. ; Bažant Z.P.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 7 起始页码: 3440
结束页码: 3445
语种: 英语
英文关键词: Biot
; Coefficient
; Hindered adsorbed water
; Shrinkage
; Swelling
; Unsaturated poromechanics
Scopus关键词: carbon
; cement
; concrete
; water
; adsorption
; Article
; Brunauer Emmett Teller isotherm
; carbon footprint
; computer simulation
; controlled study
; humidity
; isotherm
; liquid
; moisture
; molecular mechanics
; Nguyen Rahimi Bazant isotherm
; particle size
; paste
; priority journal
; solid
; unsaturated nanoporomechanics
; water loss
英文摘要: Although some important advances in the modeling of sorption and hygrothermal deformations of nanoporous materials such as hydrated cement paste, shale, coal, and some other rocks and soils have already been made, a comprehensive nanoporomechanics theory remains elusive. Here we strive to formulate it based on Gibb’s free energy of the solid–fluid system and on the recently derived Nguyen–Rahimi–Bažant (NRB) isotherm, which corrects the Brunauer–Emmett–Teller (BET) isotherm for the effect of hindered adsorbed water in filled nanopores and extends through the capillary range up to saturation. The challenge is to capture all of the basic types of relevant published experimental data, including 1) a complete sorption isotherm of hydrated cement paste (including the capillary range), 2) pore size distribution, 3) autogenous shrinkage, 4) drying shrinkage and swelling, 5) water loss or humidity change due to heating, 6) thermal expansion at various humidities, and 7) water loss of specimens caused by compression. The previous models can fit only a few data types. The present model fits all of them. It is ready for computer simulations needed to minimize the deleterious moisture effects on long-time deformations, cracking damage, and fracture in concrete infrastructure and thereby to reduce indirectly the enormous carbon footprint of concrete. Adaptations to shale, coal beds, etc., are possible. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164325
Appears in Collections: 气候变化与战略
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作者单位: Nguyen, H., Theoretical and Applied Mechanics Program, Northwestern University, Evanston, IL 60208, United States; Rahimi-Aghdam, S., Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, United States; Bažant, Z.P., Department of Civil and Environmental Engineering, McCormick School of Engineering, Northwestern University, Evanston, IL 60208, United States
Recommended Citation:
Nguyen H.,Rahimi-Aghdam S.,Bažant Z.P.. Unsaturated nanoporomechanics[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(7)