Aggregation Processes and Formation of Silico-calco-alkaline Gels under High Ionic Strength

Gaboriaud, Fabien; Nonat, André; Chaumont, Denis; Craievich, A. F.

doi:10.1006/jcis.2002.8522

Cited by 15 publications

(23 citation statements)

References 26 publications

(23 reference statements)

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“…At low calcium concentrations relatively large aggregations form initially which then densify slowly with time, whereas at higher calcium concentrations there is the rapid formation of a large number of smaller aggregates which can densify by cluster-cluster aggregation. 31 This is in good qualitative agreement with the SANS results for the first several hours of hydration, particularly the development of the volume fractal correlation length with time in the two types of paste (see Figure 7). …”

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confidence: 84%

Hydration Kinetics and Microstructure Development of Normal and CaCl₂-Accelerated Tricalcium Silicate Pastes

2009

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Microstructure development and the kinetics of hydration of pure tricalcium silicate (C 3 S) and CaCl 2 -accelerated C 3 S pastes were investigated by performing isothermal calorimetry and in situ small-angle neutron scattering (SANS) measurements on parallel specimens during the first few days of hydration, as well as on 28-day old specimens hydrated under the same curing conditions (water/cement ratio ) 0.5, 20°C). Calorimetry experiments were also performed over a range of hydration temperatures from 10 to 40°C. The calorimetry data were analyzed by applying a previously described boundary nucleation and growth model. The model indicates that CaCl 2 significantly increases the rate of nucleation of hydration product on the surface of the C 3 S particles but has relatively little effect on the product growth rate. The SANS measurements indicate that the composition and density of the calcium-silicate-hydrate (C-S-H) nanoparticles is unchanged by the addition of CaCl 2 . However, in the CaCl 2 -accelerated paste the surface fractal scattering associated with the deposition of hydration product onto the initially smooth surfaces of the C 3 S particles rapidly declines in intensity and essentially disappears by the age of 1 day, while in the pure C 3 S paste the surface fractal scattering remains prominent throughout the hydration process. The key observations from both the calorimetry and SANS analysis can be explained if in a pure C 3 S paste the C-S-H hydration product forms initially with a low packing density and then densifies at later times.

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Hydration Kinetics and Microstructure Development of Normal and CaCl₂-Accelerated Tricalcium Silicate Pastes

2009

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“…Different aggregated systems composed of nanoparticles have been explored such as gold [1,2], silver [2,3], magnetic [4][5][6] and silica nanoparticles [7].…”

Section: Introductionmentioning

confidence: 99%

“…For example, spherical superparamagnetic nanoparticles were assembled into needle-shaped structures at a macrometric scale under the application of a strong unidirectional magnetic flux [7].…”

Section: Introductionmentioning

confidence: 99%

“…As an example, aggragates of silver nanoparticles have been studied for surface-enhanced Raman scattering on a hydrophobic surface [3]. The surface plasmon absorption band of metallic particles is dependent of their aggregation state [7]. This property is used for the development of colorimetric based assays with gold [8][9][10] and silver nanoparticles [11].…”

Section: Introductionmentioning

confidence: 99%

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In situ precipitation of magnetic fluid encapsulated in giant liposomes

Beaune

Ménager

2010

Journal of Colloid and Interface Science

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“…In previous investigations, the influence of the nature of alkaline ions on the speciation of silicate oligomers in the precursor solutions [4] and on the microstructure of the gels [5][6][7][8] has been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Structural model of gelation processes of a sodium silicate sol destabilized by calcium ions: combination of SAXS and rheological measurements

Gaboriaud¹,

Nonat²,

Chaumont³

et al. 2005

Journal of Non-Crystalline Solids

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Aggregation Processes and Formation of Silico-calco-alkaline Gels under High Ionic Strength

Cited by 15 publications

References 26 publications

Hydration Kinetics and Microstructure Development of Normal and CaCl₂-Accelerated Tricalcium Silicate Pastes

Hydration Kinetics and Microstructure Development of Normal and CaCl₂-Accelerated Tricalcium Silicate Pastes

In situ precipitation of magnetic fluid encapsulated in giant liposomes

Structural model of gelation processes of a sodium silicate sol destabilized by calcium ions: combination of SAXS and rheological measurements

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Aggregation Processes and Formation of Silico-calco-alkaline Gels under High Ionic Strength

Cited by 15 publications

References 26 publications

Hydration Kinetics and Microstructure Development of Normal and CaCl2-Accelerated Tricalcium Silicate Pastes

Hydration Kinetics and Microstructure Development of Normal and CaCl2-Accelerated Tricalcium Silicate Pastes

In situ precipitation of magnetic fluid encapsulated in giant liposomes

Structural model of gelation processes of a sodium silicate sol destabilized by calcium ions: combination of SAXS and rheological measurements

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Product

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Hydration Kinetics and Microstructure Development of Normal and CaCl₂-Accelerated Tricalcium Silicate Pastes

Hydration Kinetics and Microstructure Development of Normal and CaCl₂-Accelerated Tricalcium Silicate Pastes