| 摘要 |
Disclosed is a method for retarding the surface of a concrete, mortar, or other cementitious composition, comprising spray-applying onto a surface of a hydratable concrete or mortar or other cementitious material so as to retard the curing thereof or otherwise onto a surface of a mold and thereafter placing a hydratable concrete or mortar or other cementitious material onto the sprayed mold surface, a liquid-spray-applied surface-retarder composition comprising at least one oil/solvent-soluble or oil dispersible alkyl-ester compound contained in the form of particles or as a discontinuous liquid phase distributed within a continuous non-aqueous carrier phase which is spray-applied in liquid form, said alkyl ester compound being selected from the group of an alkyl ester of citric acid, an alkyl ester of tartaric acid, an alkyl ester of malic acid, an alkyl ester of gallic acid, an alkyl ester of glycolic acid, an alkyl ester of gluconic acid, an alkyl ester of lactic acid, an alkyl ester of mandelic acid, an alkyl ester of salicylic acid, or an alkyl ester of 4-hydroxybutanoic acid, and said continuous non-aqueous liquid spray-applied carrier phase comprising a petroleum-based solvent, a vegetable oil, an animal oil, a mineral oil, or mixtures or derivative of the foregoing continuous non-aqueous carrier phases.
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