HYDRAULIC MATERIAL COMPOSITION

To provide a hydraulic material composition that includes a contraction reduction agent and has the quality of entrained air improved.SOLUTION: The present invention relates to a hydraulic material composition containing a contraction reduction agent and sugar alcohols, in which the contraction reduction agent contains a compound (A) satisfying the following conditions (1) and (2). The conditions comprise: (1) the ratio of a 15 tap flow value after 10 minutes since the start of kneading between a mortar composition in accordance with JASS 5 M402 in which the compound with 0.1% of solid content concentration is added and mortar in accordance with JASS 5 M402 in which the compound is not contained: (a 15 tap flow value of a mortar composition containing the compound)/(a 15 tap flow value of mortar not containing the compound)×100 is 120 or less; and (2) the ratio between the ratio of a 15 tap flow value after two hours since the start of kneading of a mortar composition in accordance with JASS 5 M402 in which the compound with 0.1% of solid content concentration is added, to the mortar in accordance with JASS 5 M402 in which the compound is not contained and the ratio of a 15 tap flow value after 10 minutes since the start of kneading: (the ratio of a 15 tap flow value after two hours)/(the ratio of a 15 tap flow value after 10 minutes)×100 is 110 or less.SELECTED DRAWING: None 【課題】 収縮低減剤を含むものであって、連行空気の質が改善された水硬性材料用組成物を提供する。【解決手段】 収縮低減剤と糖アルコール類とを含み、該収縮低減剤は、下記（１）及び（２）の条件を満たす化合物（Ａ）を含むことを特徴とする水硬性材料用組成物。（１）該化合物を０．１％の固形分濃度で添加したＪＡＳＳ ５ Ｍ４０２準拠のモルタル組成物と、該化合物を含まないＪＡＳＳ ５ Ｍ４０２準拠のモルタルとの混練開始から１０分後の１５打フロー値の比：（該化合物含有モルタル組成物の１５打フロー値）／（該化合物を含まないモルタルの１５打フロー値）×１００が１２０以下（２）該化合物を含まないＪＡＳＳ ５ Ｍ４０２準拠のモルタルに対する、該化合物を０．１％の固形分濃度で添加したＪＡＳＳ ５ Ｍ４０２準拠のモルタル組成物の混練開始から２時間後の１５打フロー値の比と、混練開始から１０分後の１５打フロー値の比との比：（２時間後の１５打フロー値の比）／（１０分後の１５打フロー値の比）×１００が１１０以下【選択図】なし