施工技術 (2)

[VI-42] EXPERIMENTAL STUDY ON DEVELOPMENT OF INITIAL STRENGTH OF SECONDARY LINING CONCRETE USING EXPANDING CONCRETE ADMIXTURE

*土師 康一¹、澤村 淳美¹、竹下 永造²、村手 三郎² (1. 戸田建設、2. 太平洋マテリアル)

Keywords: Middle fluidity concrete, Expansive admixture, Long distance pumping, Initial strength

It is necessary to improve the fluidity of pre-pumped concrete in the case of long-distance pumping of secondary lining concrete with shield construction, but concrete with improved fluidity, the development of strength at the young age is delayed It is generally known to do. Therefore, in this paper, focusing on the use of expansive material as a measure to improve the initial strength when medium-flow concrete is adopted as long-distance pressurized concrete, the results of examination on the strength development when using various expansive materials are described.