ESTIMATION METHOD OF ADDITION RATE OF HARDENING ACCELERATOR

To provide a method for easily estimating an optimum addition rate of a hardening accelerator.SOLUTION: An estimation method of an addition rate of a hardening accelerator performs: a process of preparing a plurality of sets of cement composition materials which are different in addition rates of a cement mass with respect to a hardening accelerator, and forming a plurality of specimens by kneading the plurality of sets of cement composition materials; a process of measuring the compression rigidity of a plurality of kneaded material ages at each of the plurality of specimens; a process of creating a graph having a first relation between an integrated temperature and the compression rigidity on the basis of a measurement value of the compression rigidity of the plurality of material ages at each of the plurality of specimens; a process of creating a graph having a second relation between an addition rate of the hardening accelerator related to the plurality of specimens, and the integrated temperature reaching a prescribed value of the compression rigidity which is acquired from the first-relation graph at each of the plurality of specimens; and a process of estimating an addition rate other than the addition rate of the hardening accelerator related to the plurality of specimens on the basis of the second-relation graph.SELECTED DRAWING: Figure 1 【課題】容易に硬化促進剤の最適な添加率を推定する方法を提供する。【解決手段】硬化促進剤の対セメント質量の添加率が異なる複数組のセメント組成物材料を準備し、前記複数組のセメント組成物材料をそれぞれ練り混ぜて、複数の供試体を作成すること、前記複数の供試体毎に、練り混ぜ後の複数の材齢における圧縮強度を測定すること、前記複数の供試体毎に、前記複数の材齢における前記圧縮強度の測定値に基づいて、積算温度と、前記圧縮強度との第１の関係のグラフを作成すること、前記複数の供試体に係る前記硬化促進剤の添加率と、前記複数の供試体毎の前記第１の関係のグラフから求められる前記圧縮強度の所定の値に到達する前記積算温度との第２の関係のグラフを作成すること、前記第２の関係のグラフに基づいて、前記複数の供試体に係る前記硬化促進剤の添加率以外の添加率を推定することを特徴とする硬化促進剤の添加率の推定方法である。【選択図】図１