A neutron diffraction study of ice and water within a hardened cement paste during freeze-thaw

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DOIResolve DOI: http://doi.org/10.1016/S0008-8846(01)00704-9
AuthorSearch for: ; Search for:
TypeArticle
Journal titleCement and Concrete Research
Volume31
Issue12
Pages18211830; # of pages: 10
SubjectCrystal size; Crystal structure; Freezing/thawing; Neutron diffraction; Pore size distribution
AbstractA 1-month-old, saturated rod of hardened Portland cement paste with w/c=0.40 was formed with, and stored under, heavy water. This rod was studied undergoing two freeze-thaw cycles over the range 227-297 K, using neutron diffraction, at slow rates of heating and cooling. Neutron diffraction gives a direct and independent quantification of the amount of ice and liquid water in the pore system of hardened cement paste as a function of temperature. The amount of ice that formed was totally reproducible over two freeze-thaw cycles, implying negligible changes to the pore size distribution and geometry. An analysis of some of the factors that may contribute to the freeze-thaw hysteresis is given. There is significant broadening of the diffraction peaks of the ice, which corresponds to a small correlation length of crystalline order in the ice. Water was observed to be "irreversibly" expelled during the first freeze, above ca. 250 K.
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AffiliationNational Research Council Canada; NRC Canadian Neutron Beam Centre
Peer reviewedNo
NPARC number12338571
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Record identifier94939cd3-4221-4261-ac39-695f62a1e0da
Record created2009-09-10
Record modified2016-05-09
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