| 摘要 |
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.
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