Impact of superplasticizer concentration and of ultra-fine particles on the rheological behaviour of dense mortar suspensions

Artelt, C.; Garcia, Emmanuel

doi:10.1016/j.cemconres.2008.01.010

Cited by 58 publications

(31 citation statements)

References 18 publications

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“…With the goal of reducing the percentage of clinker in blended Portland cements, there has been intensive research to study the interaction of superplasticizers with limestone [92][93][94][95][96]70], fly ash [93,[97][98][99][100], silica fume [101,95,102,103] slag [104,78,105], nanosilica [106,100,[107][108][109], and metakaolin [105]. Recently, Burgos-Montes et al [110] studied the compatibility between superplasticizer admixtures and cements with mineral additions.…”

Section: Effect Of Chemical Admixturesmentioning

confidence: 99%

Advances in understanding hydration of Portland cement

Scrivener

Juilland²,

Monteiro

2015

Cement and Concrete Research

893

340

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Section: Effect Of Chemical Admixturesmentioning

confidence: 99%

Advances in understanding hydration of Portland cement

Scrivener

Juilland²,

Monteiro

2015

Cement and Concrete Research

893

340

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“…On the use of CSF as SCM, Kohno and Komatsu (1986) and Artelt and Garcia (2008) reported that at a constant high-range water reducing admixture (HRWRA) dosage, the addition of CSF would decrease the flow of mortar. However, Duval and Kadri (1998) found that the addition of CSF up to 10% would reduce the HRWRA demand but further addition of CSF would increase the HRWRA demand.…”

Section: Introductionmentioning

confidence: 99%

Roles of Packing Density and Water Film Thickness in Rheology and Strength of Cement Paste

Kwan

Chen

2012

ACT

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Lowering the water/cementitious materials (W/CM) ratio is the key for the production of high-strength concrete and high-performance concrete, but there is a limit to lowering the W/CM ratio because the water added must be enough to fill the voids between solid particles and form water films coating the solid particles. Hence, an increase in packing density of the cementitious materials would allow a lower W/CM ratio to be adopted. This research aims to evaluate the effects of adding superfine cement (SFC) and condensed silica fume (CSF) on the packing density of cementitious materials, and study the roles of packing density and water film thickness in the rheological properties and compressive strength of cement paste. The results showed that the addition of SFC and/or CSF can significantly increase the packing density and water film thickness, and thereby greatly improve the rheological and strength performances of cement paste.

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“…However, the search for superplasticizers suitable for these concretes has been mainly conducted by empirical testing (Artelt and Garcia 2008). So far, mechanistic investigations have been focused on the interaction between superplasticizer and cement or some kind of model powder like limestone or MgO (Ohta et al 2000;Banfill et al 2007), while other components have been regarded as inert (Yamada et al 2000;Banjad Pecur and Stirmer 2006).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume

Plank

Schroefl

Gruber

et al. 2009

ACT

187

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Methacrylate ester as well as allylether based polycarboxylates (PCEs) were synthesized to plasticize pastes of cement and silica fume having a water/cement ratio of 0.22. Methacrylate ester copolymers were found to disperse cement well, whereas allylether copolymers are more effective with silica fume. Mechanistic investigations revealed that in cement pore solution, the surface charge of silica fume becomes positive by adsorption of Ca 2+ onto negatively charged silanolate groups present on the silica surface. This way, polycarboxylate copolymers adsorb to and disperse silica fume grains. Thus, mixtures of both copolymers were tested in cement-silica fume pastes. These blends provide significantly better dispersion than using only one polymer. Apparently, the surfaces of hydrating cement (here mainly ettringite) and silica fume are quite different with respect to their chemical composition. Therefore, PCEs with different molecular architectures are required to provide maximum coordination with calcium atoms present on these surfaces.

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Impact of superplasticizer concentration and of ultra-fine particles on the rheological behaviour of dense mortar suspensions

Cited by 58 publications

References 18 publications

Advances in understanding hydration of Portland cement

Advances in understanding hydration of Portland cement

Roles of Packing Density and Water Film Thickness in Rheology and Strength of Cement Paste

Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume

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