Concrete Freeze/Thaw as Studied by Magnetic Resonance Imaging

Prado, Pablo J.; Balcom, Bruce J.; Beyea, Steven; Bremner, T. W.; Armstrong, Robin L.; Grattan-Bellew, P.E.

doi:10.1016/s0008-8846(97)00222-6

Cited by 58 publications

(32 citation statements)

References 32 publications

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“…The combination of Single Point Imaging (SPI) with T 1 Enhancement (SPRITE) and NMR cryoporometry has been demonstrated by Prado et al (Prado et al, 1997, 1998a. Subsequently this technique was used to observe frost damage in concrete (Prado et al, 1998b). NMR cryoporometry melting curves were extracted from the profiles to obtain local pore size distributions.…”

Section: Cement and Concretementioning

confidence: 99%

Nuclear magnetic resonance cryoporometry

2008

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Nuclear Magnetic Resonance (NMR) cryoporometry is a technique for non-destructively determining pore size distributions in porous media through the observation of the depressed melting point of a confined liquid. It is suitable for measuring pore diameters in the range 2 nm -1 µm, depending on the absorbate. Whilst NMR cryoporometry is a pertabative measurement, the results are independent of spin interactions at the pore surface and so can offer direct measurements of pore volume as a function of pore diameter. Pore size distributions obtained with NMR cryoporometry have been shown to compare favourably with those from other methods such as gas adsorption, DSC thermoporosimetry, and SANS. The applications of NMR cryoporometry include studies of silica gels, bones, cements, rocks and many other porous materials. It is also possible to adapt the basic experiment to provide structural resolution in spatially dependent pore size distributions, or behavioural information about the confined liquid.

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Section: Cement and Concretementioning

confidence: 99%

Nuclear magnetic resonance cryoporometry

2008

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“…Bulk measures of T 1 and T 2 were both multiexponential (16,19,22), due to surface relaxation effects in a distribution of pore sizes (18,21), and the T 2 is fit to a two exponential decay while the T 1 is fit to a stretched exponential. The variable echo time T 2 mapping method was used in this case, to ensure sufficient experimental points to determine the local multiexponential decay.…”

Section: Relaxation Time Mapping Of a Heterogeneous Sample-partially mentioning

confidence: 99%

“…A number of variations have been proposed in the literature (12)(13)(14)(15), including our own development, SPRITE (single-point ramped imaging with T 1 enhancement) (15). We have demonstrated the usefulness of SPI/SPRITE for imaging cement (8) and concrete (16,17) materials, which have short transverse and longitudinal relaxation times, as well as for space resolved calorimetry and pore size distributions (18,19).…”

Section: Introductionmentioning

confidence: 99%

Relaxation Time Mapping of ShortT*2Nuclei with Single-Point Imaging (SPI) Methods

Beyea¹,

Balcom²,

Prado³

et al. 1998

Journal of Magnetic Resonance

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“…They were also used to monitor the formation of organised structures in complex systems such as cements during their setting [11,12] or ageing thixotrope fluids [13]. They proved very sensitive to phase changes and so allowed to monitor freezing and melting cycles in porous media [14]. In the field-cycling NMR, measurements of relaxation rates as a function of the field strength to which the system is exposed allowed to study, at the nanometric scale, the movements of molecules interacting with surfaces and quantify the time scales at which these movements take place [15,16].…”

Section: Introductionmentioning

confidence: 99%