气候变化领域集成服务门户(CCPortal): Unsaturated nanoporomechanics

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DOI	10.1073/pnas.1919337117
	Unsaturated nanoporomechanics
	Nguyen H.; Rahimi-Aghdam S.; Bažant Z.P.
发表日期	2020
ISSN	0027-8424
起始页码	3440
结束页码	3445
卷号	117 期号:7
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.
英文关键词	Biot; Coefficient; Hindered adsorbed water; Shrinkage; Swelling; Unsaturated poromechanics
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/161056
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
推荐引用方式 GB/T 7714	Nguyen H.,Rahimi-Aghdam S.,Bažant Z.P.. Unsaturated nanoporomechanics[J],2020,117(7).
APA	Nguyen H.,Rahimi-Aghdam S.,&Bažant Z.P..(2020).Unsaturated nanoporomechanics.Proceedings of the National Academy of Sciences of the United States of America,117(7).
MLA	Nguyen H.,et al."Unsaturated nanoporomechanics".Proceedings of the National Academy of Sciences of the United States of America 117.7(2020).