Methods for improved rheological control in cementitious...

C - Chemistry – Metallurgy – 04 – B

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C04B 24/38 (2006.01) C04B 28/02 (2006.01) C09K 8/20 (2006.01) C09K 8/46 (2006.01) C09K 8/514 (2006.01)

Patent

CA 2239864

A microbial polysaccharide having the features characteristic of S-657 effectively improves the rheological properties of a variety of cementitious systems. The addition of S-657 to such cementitious systems as portland cement, self-leveling grouts, fresh or saltwater oil well cement slurries, microfine cements, gives rise to substantial improvements in such properties as bleed, flow resistance, fluid loss control, and the like. In addition, S-657 provides a number of advantages, including improved free water and sedimentation control, reduced fines loss during underwater placement, enhanced stability of highly diluted microfine cementitious systems, enhanced flow and workability of superworkable and self-leveling pastes, enhanced color delivery in pigmented concrete and stabilized bubble entrapment in foamed or cellular cement systems. In sprayable cementitious systems, S-657 reduces rebound and sag.

Polysaccharide microbien possédant les caractéristiques de S-657 et améliorant efficacement les propriétés rhéologiques d'une variété de systèmes cimentaires. L'apport de S-657 à ces systèmes, tels que le ciment Portland, les coulis à étalement automatique, les boues de ciment de puits de forage de pétrole avec de l'eau douce ou de l'eau salée, les ciments microfins, provoque des améliorations importantes de propriétés, telles que le suintement, la résistance à l'écoulement, la régulation de la perte de fluide, par exemple. De plus, S-657 confère de nombreux avantages, y compris la régulation de la sédimentation et de l'eau libre, la limitation des pertes de fines pendant la mise en place sous l'eau, une stabilité accrue de systèmes cimentaires microfins extrêmement dilués, la fluidité et l'ouvrabilité améliorées de pâtes à étalement automatique extrêmement ouvrables, un dégagement de couleurs amélioré dans le béton pigmenté et un piégeage de bulles stabilisé dans les ciments cellulaires ou alvéolaires. Dans des systèmes cimentaires pulvérisables, S-657 limite le rebond et l'affaissement.

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