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Autogenous Shrinkage of Cement Paste Considering Disjoining Pressure in Thin Adsorbed Region
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 Title & Authors
Autogenous Shrinkage of Cement Paste Considering Disjoining Pressure in Thin Adsorbed Region
Lee, Chang-Soo; Park, Jong-Hyok;
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 Abstract
Meniscus, adsorbed layer thickness, capillary pressure and disjoining pressure was deduced in extended meniscus region in cement paste pore by hydrostatic equilibrium. From the results, the relationship between pore size and adsorbed layer thickness could be derived and adsorbed layer thickness represents according to pore size . Especially, disjoining pressure rapidly Increased in less than 10 nm pore size according to adsorbed layer thickness. Therefore, it is interpreted that autogenous shrinkage of cement paste is highly increases in formation of less than 10 nm pore size. Predictions of autogenous shrinkage in cement paste considering driving force for autogenous shrinkage with capillary pressure and disjoining pressure was low in comparison with experiment values between days and high in later period. These tendency could be thought that pore damage by mercury injection in early age makes shrinkage driving force underestimate and assumption for unsaturated independent pore makes overestimate. These interactions might be needed corrections considering on hydration or pore replacement model.
 Keywords
disjoining pressure;capillary pressure;autogenous shrinkage;adsorbed region;cement paste;
 Language
Korean
 Cited by
1.
인공경량골재 콘크리트의 수분이동 특성에 관한 연구,이창수;최상현;박종혁;김영욱;

대한토목학회논문집, 2009. vol.29. 4A, pp.373-384
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