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Title |
Research of Early-age Strength Development Technology for Remove the Steel Form of Large-wide Tunnel Lining Concrete
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Keywords |
터널 라이닝 콘크리트 ; 온도제어양생 ; 초기재령 콘크리트 ; 온도관리 ; Tunnel lining concrete ; Temperature control curing ; Early-age concrete ; Temperature control |
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Abstract |
The studies were carried out to process one cycle for a day to the large section tunnel lining concrete. Climatic characteristics of the tunnel inside are changed, when the temperature of the concrete placement is low, the mold remove time is increased that the heat of hydration speed be delayed because affects the strength development, to compensate for this, after installing the curing sheet on both sides of the steel form and installation of tunnel entrance, when it comes to providing the additional heat source of 28±2℃ therein, it was to be achieved early strength development control standards (4.5MPa) presented as a crack control scheme or more, thus, It was able to remove after age of 14hr from mold. On the other hand, under the conditions of 10±1℃ that a natural curing temperature in the tunnel, it was analyzed must ensure the curing time of 36hr or more after concrete placement. Throughout this study, the concrete strength development and the temperature in the early-age concrete, it can find that re-verify the curing temperature is greatly affected, even concrete fly ash is mixed 10%, if it is possible to raise the surface temperature for a predetermined time, is not a problem in the early strength development.
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