Characterisation of intra- and inter-C–S–H gel pore water in white cement based on an analysis of NMR signal amplitudes as a function of water content

1H nuclear magnetic resonance (NMR) relaxation analysis of water in progressively dried white cement paste is used to estimate the width and relative specific area of intra-C–S–H sheet pores and inter-C–S–H particle gel pores. The measurement is based on the ratio of solid echo to free induction dec...

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Bibliographic Details
Published in:Cement and concrete research 2010-12, Vol.40 (12), p.1656-1663
Main Authors: McDonald, P.J., Rodin, V., Valori, A.
Format: Article
Language:English
Subjects:
ALKALINE EARTH METAL COMPOUNDS
Amplitudes
Applied sciences
B Calcium–silicate–hydrate (C–S–H)
B Microstructure
B Pore size distribution
BUILDING MATERIALS
Buildings. Public works
CALCIUM COMPOUNDS
CALCIUM SILICATES
Cement concrete constituents
CEMENTS
COLLOIDS
DECAY
DISPERSIONS
DISTRIBUTION
Echo surveys
Exact sciences and technology
GELS
HYDRATES
HYDROGEN COMPOUNDS
Magnetic induction
MAGNETIC RESONANCE
MATERIALS
MATERIALS SCIENCE
MICROSTRUCTURE
Moisture content
NUCLEAR MAGNETIC RESONANCE
Nuclear magnetic resonance (NMR)
OXYGEN COMPOUNDS
POROSITY
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
RELAXATION
RELAXATION TIME
RESONANCE
SHEETS
SILICATES
SILICON COMPOUNDS
WATER
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Summary:1H nuclear magnetic resonance (NMR) relaxation analysis of water in progressively dried white cement paste is used to estimate the width and relative specific area of intra-C–S–H sheet pores and inter-C–S–H particle gel pores. The measurement is based on the ratio of solid echo to free induction decay signal amplitudes and the observation that as water is removed, so the surface fraction contributing to the solid echo increases. The intra- and inter-C–S–H pores are found to be 1.5 nm and 4.1 nm thick respectively. The total specific area and volume ratio is 2.4 and 0.88 respectively. The volume ratio of readily evaporable water within the pore types is 0.63. Hence, the sheet porosity is 47% of the total or 38% if based solely on evaporable water. The method is distinct from NMR analyses based on the relaxation time. There is good agreement between the measured widths by the two methods.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2010.08.003