AIR-ENTRAINING AGENT FOR HYDRAULIC COMPOSITION

To provide an air-entraining agent for a hydraulic composition, which improves hard water dilution stability by suppressing generation of aggregate in diluting and storing of hard water and has excellent miscibility with respect to a water-reducing admixture, exhibits its function in combination with the water-reducing admixture, can be added to the water-reducing admixture, and can achieve aging stabilization of air content as well as improvement of frost damage resistance.SOLUTION: An air-entraining agent for a hydraulic composition includes a chemical compound with its molecular weight less than 2,000 having (A) rosin soap and (B) at least one nitrogen atom-containing group selected from a tertiary amino group, a quaternary ammonium group and an amine oxide group.SELECTED DRAWING: None 【課題】硬水希釈・貯蔵時の凝集物の生成を抑制して硬水希釈安定性を向上させるとともに、減水剤との混合性に優れ、減水剤との併用時においてもその機能を安定的に発揮し、減水剤への内添を可能とし、空気量の経時安定化を実現可能とするとともに、耐凍害性の向上を実現可能とする、水硬性組成物用の空気連行剤を提供する。【解決手段】下記（Ａ）及び（Ｂ）：（Ａ）ロジン石鹸（Ｂ）３級アミノ基、４級アンモニウム基及びアミンオキシド基から選ばれる１種以上の窒素原子含有基を有し、分子量が２，０００未満の化合物を含有することを特徴とする、水硬性組成物用空気連行剤。【選択図】なし