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This paper discribes the method that places set-retarded concrete between alreadeyplaced concrete and newly-placed one in order to reduce thermal stress in the vicinity of construction joints of massive concrete. The purpose of this study is to prove the effect of the method. The experimental study is performed with two actual size 20m long specimens, a conventional concreting method and this new one. It is found to be particulaly effective in reducing temperature gradient of newly-placed concrete, decreasing the ratio of restriction and reducing thermal stress and to be able to prevent thoroughly occurrance of cracks in newly-placed concrete by use of this new method.

THE EXPERIMENTAL OBSERVATIONS OF THE THERMAL STRESS REDUCTION METHOD ON ACTUAL SIZE SPECIMENS