| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a concrete composition that can obtain flow retention property applicable to a case where time to casting exceeds two hours and easily adjust fresh properties in accordance with changes in temperature. <P>SOLUTION: A concrete composition includes cement, aggregate, water, and at least two kinds of dispersants. At least one kind of the dispersants is selected from the group consisting of a water reducing agent delay type, an AE water reducing agent delay type, a high performance AE water reducing agent delay type, and a fluidizing agent delay type. An initial slump flow value X and a 50 cm arrival time Y satisfy either condition A or condition B as follows. Condition A is 550≤X≤600 and -0.5X+320≤Y≤-2X+1,280. Condition B is 600≤X≤700 and -0.1X+80≤Y≤-0.4X+320. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
