1H NMR relaxation time of fluids confined in porous materials gives us information on pore structures. The purpose of this study is to establish the methodology for the estimation of time-dependent pore structure development in cement paste using
1H NMR relaxation times. We carried out
1H NMR relaxation time measurements of cement paste at 20 min curing intervals up to 72 h. Nitrogen adsorption and XRD measurements of cements prepared under the same conditions as those used for NMR measurements were performed to estimate pore size distribution and composition, respectively. By comparing the NMR results and pore size distribution, we found that
1H NMR relaxation time can identify the proton species in medium (10 to 50 nm) and large (50 nm to 1 μm) capillary pores in the cement.
1H NMR relaxation time measurements of cement paste should be a powerful tool for non-destructive and continuous monitoring of pore structure during cement solidification.
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