RETARDED AQUEOUS HYDRAULIC CEMENT SLURRY

摘要

A retarded aqueous hydraulic cement slurry, which is substantially free of lignin derivatives and which contains, in addition to water and a hydraulic cement, a retarder comprising alkaline earth metal salts of mono- and di-carboxylic acid derivatives of simple sugars. The retarder of the present invention is compatible with polyamine type fluid loss agents and with certain thixotropic cements. The retarder is also sufficiently water-soluble so that it can be prepared as a liquid additive, thereby simplifying mixing procedures in remote locations such as offshore well platforms. 26,762-F