| 摘要 |
PURPOSE:To obtain an admixture of cement which is excellent in action for enhancing fluidity of cement composition and water reducing properties, etc., by constituting the admixture of cement while keeping the formaldehyde additive cocondensate of specified two kinds of aromatic sulfonic acid alkali metallic salt as an essential component. CONSTITUTION:The formaldehyde additive cocondensate having two components consisting of a component A and a component B is produced by reacting the compd. A (e.g. phenol sodium sulfonate) shown in a formula I (R is H and 1-6C lower alkyl, X is alkali metal) and the compd. (B) e.g. sodium sulfanilate) shown in a formula II (Y is alkali metal) and formalin (C) in alkalinity. Then, an admixture of cement is produced by utilizing this cocondensate as an essential component and blending a thickener and a water-holding agent, etc., in accordance with necessity. When this admixture is added to cement composition, the fluidity thereof is enhanced. Therefore, the degree of water reduction is increased and also transport due to force-feed of a pump is enabled. |
