施工技術 (2)

[VI-43] Application to the shield secondary lining of concrete with improved initial strength development

*澤村 淳美¹、土師 康一¹、高橋 健一¹、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:Initial strength, Material strength, Shield secondary lining concrete, Long distance pumping, Medium flow concrete

In the case of secondary lining concrete for shield construction, it is often removed after about 15 to 19 hours after placing. The authors conducted a study on the combination of concrete with early-strength expansive additive and hardening ccelerator in order to improve the strength development of the secondary lining concrete. In this paper, we focus on temporal retention and strength development, and describe the details.