Adsorption and heterocoagulation of nonionic surfactants and latex particles on cement hydrates

Merlin, Fabrice; Guitouni, Hicham; Mouhoubi, Hayette; Mariot, Sandrine; Vallée, F.; Damme, H. Van

doi:10.1016/j.jcis.2004.08.042

Cited by 67 publications

(38 citation statements)

References 43 publications

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“…Polymers are widely applied in petroleum engineering, civil engineering and construction applications (Merlin et al 2005) . With regard to cement based materials, polymers are applied as superplasticizers, air-entraining admixtures, shrinkage-reducing admixtures, etc.…”

Section: Introductionmentioning

confidence: 99%

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Koleva

et al. 2013

ACT

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The influence of limited concentration, of 0.025 wt.% per cement weight, poly (ethylene oxide) -block -polystyrene vesicles on the hydration process, microstructure and micromechanical properties of cement paste at early hydration age of maximum 7 days are discussed. Isothermal calorimetry and non-evaporable water content tests indicate that the admixed vesicles have no apparent influence on the process of cement hydration, but affect microstructural properties. Whereas nitrogen adsorption tests reveal that the gel pore structure of the vesicles-modified matrix is almost identical to the vesicles-free one, mercury intrusion porosimetry proves refined capillary porosity and reduced total porosity in the presence of admixed vesicles. Nano-indentation supports the above observations and indicates that the admixed vesicles act as nucleation sites, leading to a more uniform distribution of low density hydration products.

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Section: Introductionmentioning

confidence: 99%

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Koleva

et al. 2013

ACT

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“…É conhecido que a utilização dos látex poliméricos retarda a hidratação do cimento e aumenta o teor de ar incorporado na matriz cimentícia devido à presença de tensoativos na composição dos látex, fatos que podem afetar as propriedades no estado endurecido (JINGANG et al, 2005;MERLIN et al, 2005).…”

Section: Introductionunclassified

Efeito da adição de látex nas pastas de cimento branco no estado endurecido

Carbone¹,

Santos²,

Romano

et al. 2013

Ambient. constr.

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Resumoste trabalho investiga o impacto da utilização de látex poliméricos em propriedades de pastas de cimento Portland branco no estado endurecido. Para tanto, foram utilizados dois látex com propriedades físico-químicas distintas: EVA (etileno de vinil acetato) em pó redispersível, e SAE (estireno acrílico) na forma de emulsão. As pastas foram preparadas com relação água/cimento constante de 0,40, e as quantidades de látex foram variadas, de 5% a 20% de constituintes ativos em relação à massa de cimento. Apesar de os látex poliméricos terem afetado negativamente a reação de hidratação do cimento de forma distinta, houve aumento na resistência mecânica e redução da absorção de água e da permeabilidade ao vapor, com maior teor látex/cimento. Palavras

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“…This retarding effect of the polymer, described in the literature [14-18, 39, 40], can be explained by the adsorption of polymer particles on cement particles. Merlin et al [40] has shown that setting retardation is linearly related to the cement surface coverage by the latex particles. In our case, the retarding effect is enhanced at temperatures above the T g because the polymer is softened.…”

Section: Influence Of Redispersible Polymer Powder On the Cement Hydrmentioning

confidence: 99%

Cement-Polymer Composites for Oilwell Cementing

Chougnet

Audibert‐Hayet

Moan

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Composites ciment-polymère pour la cimentation des puits pétroliers -La durabilité des matériaux utilisés pour les sondages pétroliers est une question essentielle pour garantir l'étanchéité à long terme des puits. Des composites ciment/polymère présentent de bonnes propriétés mécaniques et de durabilité : il est en effet connu que l'ajout de latex améliore l'adhésion ou la flexibilité des pâtes de ciment durcies. Ainsi, des composites ciment/polymère apparaissent comme de bons matériaux de cimentation de puits dans des environnements sévères. Lors de la construction d'un puits, le placement du laitier de ciment dépend très fortement de ses propriétés rhéologiques. Dans cet article, nous avons étudié les propriétés rhéologiques de suspensions composites à base de ciment et de poudre de polymère : nous montrons que sous cisaillement oscillatoire, ces suspensions présentent une transition d'un état gélifié vers un état de type liquide. Le remplacement d'une partie des particules de ciment par des particules de polymère induit une baisse du module de conservation de l'état gel. La bonne dispersion des particules de polymères et leur forte affinité pour les grains de ciment ont été observées par microscopie électronique. Des expériences de spectroscopie RMN et de calorimétrie ont mis en évidence une influence de l'addition de particules de polymères sur les mécanismes d'hydratation et de durcissement de la matrice cimentaire. L'ensemble des résultats acquis a amélioré notre compréhension des relations entre la composition du coulis, son comportement rhéologique et les propriétés du matériau durci, ce qui nous a permit de formuler de nouveaux matériaux de cimentation. Abstract -Cement-Polymer Composites for Oilwell Cementing -The selection of an optimal cementitious material is critical to maintain zonal isolation for the lifetime of oil & gas or gas

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Adsorption and heterocoagulation of nonionic surfactants and latex particles on cement hydrates

Cited by 67 publications

References 43 publications

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Efeito da adição de látex nas pastas de cimento branco no estado endurecido

Cement-Polymer Composites for Oilwell Cementing

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