Micropore size analysis in hydrated cement paste by NMR

Plassais, A.; Pomiès, Marie-Pierre; Lequeux, Nicolas; Boch, P.; Korb, Jean-Pierre

doi:10.1016/s0730-725x(01)00276-4

Cited by 19 publications

(12 citation statements)

References 5 publications

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“…Some papers [27][28][29][30], based on the nuclear magnetic resonance (NMR), have indicated the fractal nature of C-S-H gel, as does the protoninduced X-ray emission (PIXE) [31] which recorded the fractal dimension of C-S-H gel in good agreement with the values determined by SANS [6] and NMR [32]. There are also some methods utilizing the fractal image analysis of the surface of cement materials.…”

Section: Sas Techniquementioning

confidence: 89%

A remark on nano-particle stability of cement C-S-H gel

Ficker¹,

Len²,

Martišek³

2011

Open Physics

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Abstract:Hydrated pastes of ordinary Portland cement prepared with different water-to-cement ratios were investigated by using the small-angle neutron scattering technique in the region of Q ∈ (0 0045 0 11) Å −1 . Samples of cement pastes were subjected to non-standard hydration conditions using a mix with D 2 O, low RH, and water-to-cement ratios spread over a very wide interval (0.4; 1.4). The investigation was focused on testing the structural stability of nano-metric particles in the cement C-S-H gel. Owing to the high structural stability of these nano-particles, their average diameter might be used as a microscopic parameter characterizing the nano-metric structure of C-S-H gels. The average diameter of the nano-particles of the studied ordinary Portland cement CEMI 42.5 R-SC was found to be close to the value of 4.2 nm and independent of the water-to-cement ratios. PACS

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Section: Sas Techniquementioning

confidence: 89%

A remark on nano-particle stability of cement C-S-H gel

Ficker¹,

Len²,

Martišek³

2011

Open Physics

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“…Importantly, is the pore diameter of the confining pore structure; Equation (1) therefore provides a direct link between the observed NMR relaxation time constants and the microstructural characteristics of the materials under investigation. This relationship is further resolved through the assumption of so-called surface-limited relaxation, a regularly-applied assumption for cementitious materials and other heterogeneous porous media, wherein 4 ⁄ ≫ (McDonald et al, 2007(McDonald et al, , 2005Monteilhet et al, 2006;Plassais et al, 2001). In this case Equation (1) simplifies to (Korb, 2018) 1…”

Section: Theorymentioning

confidence: 99%

Understanding the microstructural evolution of hypersaline cemented paste backfill with low-field NMR relaxation

Nasharuddin¹,

Luo²,

Robinson³

et al. 2021

Preprint

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Cemented paste backfill (CPB) comprising mineral tailings, binders and mixing waters is an important potential support material in the mining industry. As the mechanical properties of CPB are significantly influenced by its microstructural characteristics the development of measurement tools to better understand its pore structure evolution is important for its increased utilisation. This study reports the application of low-field nuclear magnetic resonance (NMR) relaxation time measurements to characterise the microstructural evolution of CPB materials over 56 days of hydration, contrasting common tap water and hypersaline water (~22 wt% salt) as mixing waters. Distinct NMR relaxation time populations were evidenced within each CBP sample, revealing the presence of both capillary (T1,2 ≈ 10 ms) and gel pore water (T1,2 ≈ 300 – 500 µs), with time-dependent relaxation measurements facilitating characterisation of capillary pore structure evolution over the hydration period assessed. Hypersaline samples demonstrated a time-lag in this measured capillary pore evolution, relative to those hydrated with tap water, while hydration rates were observed to increase with increased CPB binder content. Further, both T1 and T2 NMR relaxation times were found to correlate with the uniaxial compressive strength of the CPB materials investigated, facilitating the formulation of a predictive correlation function between NMR relaxation characteristics and mechanical properties.

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“…Cela a permis aux auteurs de suivre la diminution de T 1 avec l'avancement de la réaction d'hydratation, et d'étudier l'inversion de la population des composantes en T 1 en fonction de la distribution de taille des pores entre le début de l'hydratation et six mois. Dans le cas d'hydratation de C 3 S [13], une seule valeur de T 1 est observée avant 7 h, puis il y a apparition de deux, puis trois composantes. Bohris et al [14] utilisent également la combinaison de mesures SRM (T 2 ) et IRM (écho de gradient) pour étudier l'effet de la cure (séchage ou étanche) sur la répartition de l'eau d'une part, et l'effet de la formulation sur la répartition des pores.…”

Section: Caractérisation Des Matériaux Cimentaires Par Rmnunclassified

Suivi par IRM et par T1 de l'effet du couplage hydratation–séchage sur la microstructure de pâte de ciment

Faure¹,

Caré²

2005

Comptes Rendus. Chimie

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Micropore size analysis in hydrated cement paste by NMR

Cited by 19 publications

References 5 publications

A remark on nano-particle stability of cement C-S-H gel

A remark on nano-particle stability of cement C-S-H gel

Understanding the microstructural evolution of hypersaline cemented paste backfill with low-field NMR relaxation

Suivi par IRM et par T1 de l'effet du couplage hydratation–séchage sur la microstructure de pâte de ciment

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