NMR studies of pore formation and water diffusion in self-hardening cut-off wall materials

W. Schoenfelder, J. Dietrich, A. Maerten, K. Kopinga, F. Stallmach

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10 Citations (Scopus)


Cut-off walls for the containment of polluted sites are vertical in-ground barriers of low hydraulic cond. To construct these barriers, self-hardening watery suspensions of a special cement-based hydraulic binder and a cement-stable bentonite are used. The formation of the pore structure during hardening of suspensions with different solid contents and the water self-diffusion in the resulting cut-off wall materials were studied by non-destructive 1H NMR techniques. It was found that an increased amt. of hydrating solids in the suspension leads to a decrease in NMR relaxation times and self-diffusion coeffs. of the pore water, indicating a redn. of the pore sizes and an enhancement of the diffusion resistance. The self-diffusion coeffs. of the water in the hardened cut-off wall materials were detd. to be about four orders of magnitude smaller than in bulk liq. water and two orders of magnitude smaller than in pure bentonite-water suspensions confirming the excellent diffusive resistance of the cut-off wall materials.
Original languageEnglish
Pages (from-to)902-908
Number of pages7
JournalCement and Concrete Research
Issue number6
Publication statusPublished - 2007


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