| 摘要 |
PURPOSE: To minimize the adding quantity of a hydration heat-decreasing agent and prevent cracking. CONSTITUTION: The whole placing area D of mass concrete is divided into the first area of concrete 1 without hydration heat-decreasing agent and the second area of concrete 2 with hydration heat-decreasing agent. The placing area L of the second concrete 2 is divided into n areas 11 , 12 ,..., 1n and the initial value of the addition rate in respective layers of the second concrete 2 is a1 , a2 ,... an . The addition rate of the hydration heat-decreasing agent of respective layers of the second concrete 2 is increased gradually by everyΔa from the initial value to the upper limit value Amax to get the addition rate of the hydration heat-decreasing agent of the second concrete 2 at the time when the tensile stress of concrete in respective positions, calculated from a temperature-stress analysis is less than the tensile strength of concrete and the addition volume of the hydration heat-decreasing agent becomes minimum.
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