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- W2093408201 abstract "A critical evaluation of shrinkage of saturated cement paste due to thermal cycling, increased ion diffusion through saturated cement paste due to thermal cycling, Powers water permeability data of dried and resaturated cement paste, and dying shrinkage data of Pickett and others reveals an intrinsic instability of Portland cement pastes. The instability is such that even a very mild treatment of the paste causes a redistribution of pore space such that pores are narrowed in some area and widened in other areas. It is to be noted that mild drying to 94% relative humidity is sufficient to initiate this instability. These changes occur even in saturated specimens and are irreversible. These observations are inconsistent with extensive chemical bonding in hardened cement paste or the strength of chemical bonding, in cement paste, is so low that a very mild treatment can destroy them. Relevance of this redistribution to water absorption isotherms, mercury intrusion porosimetry, etc has been discussed. These techniques provide information on the treated samples and not on the microstructure of virgin wet cement pastes and as such they can not be used to rationalize the properties of cement pastes or concrete." @default.
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- W2093408201 date "2008-10-13" @default.
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- W2093408201 title "Intrinsic Instability of Hardened Portland Cement Pastes and its Significance" @default.
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- W2093408201 doi "https://doi.org/10.2174/1874836800802010170" @default.
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