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http://dx.doi.org/10.11112/jksmi.2014.18.5.116

Research of Early-age Strength Development Technology for Remove the Steel Form of Large-wide Tunnel Lining Concrete  

Kim, Kwang-Don ((주)고려이엔씨기술사사무소)
Lee, Deuk-Bok (롯데건설(주) 강남순환도시고속도로(6-2공구) 현장, 서울시립대학교 대학원)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.18, no.5, 2014 , pp. 116-127 More about this Journal
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 $28{\pm}2^{\circ}C$ 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 $10{\pm}1^{\circ}C$ 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 reverify 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.
Keywords
Tunnel lining concrete; Temperature control curing; Early-age concrete; Temperature control;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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