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Pore fluid salinity effects on physicochemical-compressive behaviour of reconstituted marine clays
AbstractIt has been well recognized that pore fluid salinity significantly affects physical and mechanical properties of clays. However, how to correlate the pore fluid salinity effects on mechanical behaviour with physicochemical variations induced by pore fluid salinity changes is still pending. This study investigates the changes in liquid limit, oxide compositions and compressibility with pore fluid salinity, based on experimental data obtained from reconstituted specimens of two marine clays in China. It is found that oxide compositions vary little with the change in pore fluid salinity, indicating that no chemical reaction occurs during pore salt changing for the investigated clays. Such a finding means that the pore fluid salinity effects on compression behaviour of reconstituted clays can be attributed to the variations in physical properties. For the investigated marine clays with illite as predominant clay mineral, the void ratio at liquid limit is the crucial physical index of assessing the pore fluid salinity effects on the compression behaviour. The intrinsic compression concept is also introduced to compare the compression behaviour of reconstituted clays with and without pore salt. A quantitative approach is proposed to assess the pore fluid salinity effects on the compression behaviour of marine clays reconstituted at different initial water contents.
HighlightsPore fluid salinity effects on physical-compression properties are investigated.Pore fluid salinity has little effect on oxide compositions of marine clays.Compressibility of reconstituted clays with pore salt is controlled by e0 and eL.An approach is proposed to assess pore fluid salinity effects on compressibility.
Pore fluid salinity effects on physicochemical-compressive behaviour of reconstituted marine clays
AbstractIt has been well recognized that pore fluid salinity significantly affects physical and mechanical properties of clays. However, how to correlate the pore fluid salinity effects on mechanical behaviour with physicochemical variations induced by pore fluid salinity changes is still pending. This study investigates the changes in liquid limit, oxide compositions and compressibility with pore fluid salinity, based on experimental data obtained from reconstituted specimens of two marine clays in China. It is found that oxide compositions vary little with the change in pore fluid salinity, indicating that no chemical reaction occurs during pore salt changing for the investigated clays. Such a finding means that the pore fluid salinity effects on compression behaviour of reconstituted clays can be attributed to the variations in physical properties. For the investigated marine clays with illite as predominant clay mineral, the void ratio at liquid limit is the crucial physical index of assessing the pore fluid salinity effects on the compression behaviour. The intrinsic compression concept is also introduced to compare the compression behaviour of reconstituted clays with and without pore salt. A quantitative approach is proposed to assess the pore fluid salinity effects on the compression behaviour of marine clays reconstituted at different initial water contents.
HighlightsPore fluid salinity effects on physical-compression properties are investigated.Pore fluid salinity has little effect on oxide compositions of marine clays.Compressibility of reconstituted clays with pore salt is controlled by e0 and eL.An approach is proposed to assess pore fluid salinity effects on compressibility.
Pore fluid salinity effects on physicochemical-compressive behaviour of reconstituted marine clays
Song, Miao-Miao (author) / Zeng, Ling-Ling (author) / Hong, Zhen-Shun (author)
Applied Clay Science ; 146 ; 270-277
2017-06-14
8 pages
Article (Journal)
Electronic Resource
English
Marine clays , Compressibility , Predominant clay mineral , Pore fluid salinity , Liquid limit , Oxide compositions , <italic>C</italic><sup>⁎</sup><inf>c</inf> , intrinsic compression index of reconstituted clays, equal to (<italic>e</italic><sup>⁎</sup><inf>100</inf><hsp></hsp>−<hsp></hsp><italic>e</italic><sup>⁎</sup><inf>1000</inf>) , <italic>e</italic> , void ratio , <italic>e</italic><inf>L</inf> , void ratio at the liquid limit , <italic>e</italic><inf>0</inf> , initial void ratio , <italic>e</italic><sup>⁎</sup><inf>100</inf> , void ratio of reconstituted clays at <italic>σ′</italic><inf>v</inf><hsp></hsp>=<hsp></hsp>100<hsp></hsp>kPa , <italic>e</italic><sup>⁎</sup><inf>1000</inf> , void ratio of reconstituted clays at <italic>σ′</italic><inf>v</inf><hsp></hsp>=<hsp></hsp>1000<hsp></hsp>kPa , EICL , extended intrinsic compression line , ICL , intrinsic compression line , <italic>I</italic><inf>v</inf> , void index , <italic>m</italic><inf>f</inf> , mass of pore fluid , <italic>m</italic><inf>s</inf> , mass of soil particles of clays , <italic>m</italic><inf>sa</inf> , mass of dissolved salt in pore fluid , <italic>m</italic><inf>w</inf> , mass of pore water of clays , <italic>S</italic><inf>PL</inf> , pore fluid salinity , <italic>w</italic> , water content , <italic>w</italic><inf>f</inf> , fluid content of clays containing dissolved salt , <italic>w</italic><inf>L</inf> , liquid limit , <italic>w</italic><inf>n</inf> , natural water content , <italic>w</italic><inf>p</inf> , plastic limit , <italic>w</italic><inf>0</inf> , initial water content , XRD , X-ray diffractometry , <italic>ε</italic><inf>v</inf> , volumetric strain , <italic>ρ</italic><inf>s</inf> , particle density , <italic>σ′</italic><inf>yr</inf> , remoulded yield stress , <italic>σ′</italic><inf>v</inf> , effective vertical stress , <italic>θ</italic> , diffraction angle
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