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Micro porosity evolution in compacted swelling clays — A chemical approach

Majid Sedighi, Hywel Thomas Orcid Logo

Applied Clay Science, Volume: 101, Pages: 608 - 618

Swansea University Author: Hywel Thomas Orcid Logo

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Abstract

This paper presents a new approach to investigate the variation of microscopic porosity/pore water interactions in compacted swelling clays. The aim of the research has been to develop a theoretical formulation for the prediction of micro-porosity variations with suction and temperature in compacted...

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Published in: Applied Clay Science
ISSN: 0169-1317
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa52876
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first_indexed 2019-11-26T13:15:41Z
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2021-01-15T10:30:40.0408339</datestamp><bib-version>v2</bib-version><id>52876</id><entry>2019-11-26</entry><title>Micro porosity evolution in compacted swelling clays &#x2014; A chemical approach</title><swanseaauthors><author><sid>08ebc76b093f3e17fed29281f5cb637e</sid><ORCID>0000-0002-3951-0409</ORCID><firstname>Hywel</firstname><surname>Thomas</surname><name>Hywel Thomas</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2019-11-26</date><deptcode>CIVL</deptcode><abstract>This paper presents a new approach to investigate the variation of microscopic porosity/pore water interactions in compacted swelling clays. The aim of the research has been to develop a theoretical formulation for the prediction of micro-porosity variations with suction and temperature in compacted smectite. The model developed is based on a geochemical formulation of interlayer hydration/dehydration of smectite.An established theoretical approach based on regular solid-solution theory is adopted to describe the water adsorption/desorption in the interlayer of smectite. The thermodynamic parameters of the model for the case of two bentonite clays, namely MX-80 and FEBEX are presented. Thermodynamic parameters of the hydration model including Margules parameter (Ws ) and logarithm of the equilibrium constant (log Keq ) at ambient temperature were found to be &#x2212;2420 cal/mol and &#x2212;1.42, for compacted MX-80 and &#x2212;3330 cal/mol and &#x2212;2.79, for compacted FEBEX, respectively.Micro/macro-porosity evolutions with dry density and relative humidity are presented. The results are compared with alternative approximations reported in the literature which show a close correlation. Variations of the micro and macro-porosity in compacted bentonite with hydration processes are also studied through the application of the model under restrained swelling and isothermal conditions. The results provide an insight into the evolution of pore water in compacted bentonite during saturation and quantify the distribution of water in micro and macro pores.</abstract><type>Journal Article</type><journal>Applied Clay Science</journal><volume>101</volume><journalNumber/><paginationStart>608</paginationStart><paginationEnd>618</paginationEnd><publisher/><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0169-1317</issnPrint><issnElectronic/><keywords>Smectite hydration, Geochemical solid-solution, Interlayer porosity, Compacted bentonite, MX-80, FEBEX</keywords><publishedDay>1</publishedDay><publishedMonth>11</publishedMonth><publishedYear>2014</publishedYear><publishedDate>2014-11-01</publishedDate><doi>10.1016/j.clay.2014.09.027</doi><url>http://dx.doi.org/10.1016/j.clay.2014.09.027</url><notes/><college>COLLEGE NANME</college><department>Civil Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CIVL</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2021-01-15T10:30:40.0408339</lastEdited><Created>2019-11-26T10:18:48.9682058</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering</level></path><authors><author><firstname>Majid</firstname><surname>Sedighi</surname><order>1</order></author><author><firstname>Hywel</firstname><surname>Thomas</surname><orcid>0000-0002-3951-0409</orcid><order>2</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2021-01-15T10:30:40.0408339 v2 52876 2019-11-26 Micro porosity evolution in compacted swelling clays — A chemical approach 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 2019-11-26 CIVL This paper presents a new approach to investigate the variation of microscopic porosity/pore water interactions in compacted swelling clays. The aim of the research has been to develop a theoretical formulation for the prediction of micro-porosity variations with suction and temperature in compacted smectite. The model developed is based on a geochemical formulation of interlayer hydration/dehydration of smectite.An established theoretical approach based on regular solid-solution theory is adopted to describe the water adsorption/desorption in the interlayer of smectite. The thermodynamic parameters of the model for the case of two bentonite clays, namely MX-80 and FEBEX are presented. Thermodynamic parameters of the hydration model including Margules parameter (Ws ) and logarithm of the equilibrium constant (log Keq ) at ambient temperature were found to be −2420 cal/mol and −1.42, for compacted MX-80 and −3330 cal/mol and −2.79, for compacted FEBEX, respectively.Micro/macro-porosity evolutions with dry density and relative humidity are presented. The results are compared with alternative approximations reported in the literature which show a close correlation. Variations of the micro and macro-porosity in compacted bentonite with hydration processes are also studied through the application of the model under restrained swelling and isothermal conditions. The results provide an insight into the evolution of pore water in compacted bentonite during saturation and quantify the distribution of water in micro and macro pores. Journal Article Applied Clay Science 101 608 618 0169-1317 Smectite hydration, Geochemical solid-solution, Interlayer porosity, Compacted bentonite, MX-80, FEBEX 1 11 2014 2014-11-01 10.1016/j.clay.2014.09.027 http://dx.doi.org/10.1016/j.clay.2014.09.027 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2021-01-15T10:30:40.0408339 2019-11-26T10:18:48.9682058 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Majid Sedighi 1 Hywel Thomas 0000-0002-3951-0409 2
title Micro porosity evolution in compacted swelling clays — A chemical approach
spellingShingle Micro porosity evolution in compacted swelling clays — A chemical approach
Hywel Thomas
title_short Micro porosity evolution in compacted swelling clays — A chemical approach
title_full Micro porosity evolution in compacted swelling clays — A chemical approach
title_fullStr Micro porosity evolution in compacted swelling clays — A chemical approach
title_full_unstemmed Micro porosity evolution in compacted swelling clays — A chemical approach
title_sort Micro porosity evolution in compacted swelling clays — A chemical approach
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
author Hywel Thomas
author2 Majid Sedighi
Hywel Thomas
format Journal article
container_title Applied Clay Science
container_volume 101
container_start_page 608
publishDate 2014
institution Swansea University
issn 0169-1317
doi_str_mv 10.1016/j.clay.2014.09.027
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
url http://dx.doi.org/10.1016/j.clay.2014.09.027
document_store_str 0
active_str 0
description This paper presents a new approach to investigate the variation of microscopic porosity/pore water interactions in compacted swelling clays. The aim of the research has been to develop a theoretical formulation for the prediction of micro-porosity variations with suction and temperature in compacted smectite. The model developed is based on a geochemical formulation of interlayer hydration/dehydration of smectite.An established theoretical approach based on regular solid-solution theory is adopted to describe the water adsorption/desorption in the interlayer of smectite. The thermodynamic parameters of the model for the case of two bentonite clays, namely MX-80 and FEBEX are presented. Thermodynamic parameters of the hydration model including Margules parameter (Ws ) and logarithm of the equilibrium constant (log Keq ) at ambient temperature were found to be −2420 cal/mol and −1.42, for compacted MX-80 and −3330 cal/mol and −2.79, for compacted FEBEX, respectively.Micro/macro-porosity evolutions with dry density and relative humidity are presented. The results are compared with alternative approximations reported in the literature which show a close correlation. Variations of the micro and macro-porosity in compacted bentonite with hydration processes are also studied through the application of the model under restrained swelling and isothermal conditions. The results provide an insight into the evolution of pore water in compacted bentonite during saturation and quantify the distribution of water in micro and macro pores.
published_date 2014-11-01T04:05:30Z
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score 11.005727