The depth of excavation for railway tunnel is increasing when applied to the tunnel excavation under the pre-existing railways, especially in urban or downtown area. As recently increasing the number of deep and big tunnel, development of new excavation technology,…
The depth of excavation for railway tunnel is increasing when applied to the tunnel excavation under the pre-existing railways, especially in urban or downtown area. As recently increasing the number of deep and big tunnel, development of new excavation technology, giving little damage to the railways located in the neighborhood, as well as improving the quality of concrete and construction technology, was concerned. In Korea, lining concrete of tunnel is considered to be an ordinary concrete having a slump 150 ± 30 mm until now. However, when applying the ordinary concrete in tunnel lining, it often cause the degradation of performance and quality for construction, and also the second grouting is required in order to fill in the cavitations of the crown of tunnel lining after casting concrete. To solve these problems, high fluidity concrete for tunnel lining have been developed and have proven to be successful in the field of application of tunnel lining. As a part of the research for increasing the flow and viscosity, the manufacturing technology of a high fluidity concrete for tunnel lining is developed and applied after conducting both BP (Batch plant) and field test.