| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forcibly feeding concrete, in which the pump forced feedability of poor mix concrete having 8-15 cm slump value is improved so that the slump value is restrained from being changed before and after the poor mix concrete is forcibly fed by a pump and excellent executability can be imparted thereto.SOLUTION: In the method for forcibly feeding concrete by the pump, the predetermined concrete containing water, cement, a mixing agent, a polysaccharide derivative and an aggregate is forcibly fed by the pump. The polysaccharide derivative is obtained by substituting hydrophobic substituents, each of which has a 8-40C hydrocarbon chain as a partial structure, or ionic hydrophilic groups, each of which has one or more groups selected from the group consisting of a sulfonic acid group and a sulfonate group as another partial structure, for hydrogen atoms of a part or the whole of hydroxyl groups of a polysaccharide, an alkylated derivative thereof, or a hydroxyalkylated derivative thereof. |
