Nucleation and growth of C-S-H phases on mineral admixtures

Stark, Jochen; Möser, B.; Bellmann, F.

doi:10.1007/978-3-540-72448-3_54

Cited by 20 publications

(28 citation statements)

References 2 publications

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“…Another aspect of the filler effect results from enhanced nucleation resulting from seeding provided by SCMs. Because of the seeding effect, the induction period of cement hydration can be dramatically reduced and hydration rate can be increased during the early period [2,16]. The reduction in the induction period is due to C-S-H precipitating faster on the nucleation sites provided by the SCMs than on the surface of cement grains [2,16].…”

Section: Introductionmentioning

confidence: 97%

“…SCMs can have a dilution effect at early ages and/or a seeding effect [2,14,16]. When using SCMs in cementitious systems, typically the amount of cement in the system is reduced and replaced by the SCM, effectively diluting the amount of cement in the system.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the seeding effect, the induction period of cement hydration can be dramatically reduced and hydration rate can be increased during the early period [2,16]. The reduction in the induction period is due to C-S-H precipitating faster on the nucleation sites provided by the SCMs than on the surface of cement grains [2,16]. SCM surface area reactivity and "chemical affinity" [16] are the primary factors that determine the ability of SCMs to provide nucleation sites for C-S-H precipitation [2,16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of the retarding mechanisms of zinc oxide and sucrose on cement hydration and interactions with supplementary cementitious materials

Ataie

Juenger

Taylor-Lange

et al. 2015

Cement and Concrete Research

116

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of the retarding mechanisms of zinc oxide and sucrose on cement hydration and interactions with supplementary cementitious materials

Ataie

Juenger

Taylor-Lange

et al. 2015

Cement and Concrete Research

116

View full text Add to dashboard Cite

“…This effect depends on: (1) the fineness of the fillers' particles, since a greater fineness means a higher specific surface area; (2) the amount of filler used, since the probability for nucleation sites increases with the amount of foreign particles; (3) the affinity of the fillers' particles for cement hydrates, which is related to the chemical nature of the filler used. Stark et al [13] and Berodier and Scrivener [14] reported on direct observations of different nucleation and growth of C-S-H on quartz, calcite and cement surfaces. Since the chemical nature of fillers and cement is different, logically various chemical mechanisms would play a role for the divergence in the rate of C-S-H nucleation, orientation and growth on each surface.…”

Section: Introductionmentioning

confidence: 99%

Insights into the mechanisms of nucleation and growth of C–S–H on fillers

et al. 2017

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A complete understanding of the mechanisms upon which a filler acts in a cement-based material, e.g. as a C-S-H nucleation and/or growthinducing factor, is of high importance. Although various studies report on accelerated cement hydration in the presence of fillers, the reason behind these observations is not completely understood yet. This work contributes to this subject, by providing an experimental evidence on the (electro) chemical aspects of the filler surface modification in the model solution, simulating the pore solution of cement paste. The nature of the various interactions with regard to the affinity of a filler surface towards C-S-H nucleation and growth was discussed in detail in this work with regard to zeta potential measurements of micronized sand and limestone particles in the model solutions. These results are further supported by microscopic observations of morphology and distribution of hydration products on the filler surfaces, together with considerations on thermodynamic principles in view of hydration products formation and distribution. The C-S-H nucleation and growth appeared to be due to the interactions between a filler surface and calcium ions in the pore solution. These interactions were determined by the chemical nature of the filler surface. The interaction mechanisms were found to be governed by relatively weak electrostatic forces in the case of micronized sand. This was reflected by a non-significant adsorption of calcium ions on the filler surface, resulting in non-uniformly distributed and less stable C-S-H nuclei. In contrast, the nucleation and growth of C-S-H on limestone particles were predominantly determined by donoracceptor mechanisms, following moderate acid-base interactions. Consequently, a strong chemical bonding of calcium ions to a limestone surface resulted in a large amount of uniformly distributed C-S-H nuclei.

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“…Depollution effect of ultrafine titania is based on nitrogen oxide reduction by UV-light and surface catalytic properties of titania [11]. Ultrafine calcium carbonate affects cement hydration through its high surface area, offering additional nucleation sites for calcium-silicatehydrate to precipitate [12]. Also effects of magnetic nanoparticles in concrete have been studied [13].…”

Section: Introductionmentioning

confidence: 99%

Spray-Dry Agglomerated Nanoparticles in Ordinary Portland Cement Matrix

Vehmas¹,

Kanerva²,

Holt³

2014

MSA

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Nano-sized particles have got a focus of great interest for the past decade. These ultrafine particles can have an effect in multiple ways on concrete technology. Although most of the effects of nanoparticles are desired, a huge surface area introduced by nanoparticles also incorporates negative effects, such as loss of workability and safety aspects. Agglomeration of nano-sized particles by spray-drying is one potential method to overcome the negative effects. In this study, ultra-fine material was dispersed and agglomerated successfully. Agglomerate structure was analyzed and performance was evaluated with mortar samples. Agglomerated nano-sized material had micronsized inner porosity, which enabled water penetration into the agglomerates. In water exposure, agglomerates did not dissolve although some of binder glue and dispersing agent leaked out. Water penetration and organic material leaking enabled high reactivity and workability of the agglomerated nanoparticles. In spite of the high reactivity of agglomerated nanoparticles, slightly lower final compression strengths were observed with agglomerated ultrafine particles. The results of this study can be used in concrete technology when further developing admixture technologies and recipe designs. The negative side-effects of the agglomerated nanoparticles can be overcome and accounted for within application areas.

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Nucleation and growth of C-S-H phases on mineral admixtures

Cited by 20 publications

References 2 publications

Comparison of the retarding mechanisms of zinc oxide and sucrose on cement hydration and interactions with supplementary cementitious materials

Comparison of the retarding mechanisms of zinc oxide and sucrose on cement hydration and interactions with supplementary cementitious materials

Insights into the mechanisms of nucleation and growth of C–S–H on fillers

Spray-Dry Agglomerated Nanoparticles in Ordinary Portland Cement Matrix

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