塩害 (1)

[V-164] Study regarding a penetration of chloride at the inner/outer surface of the box type tunnel for subway (phase1)

*Sachie Nakamura¹, Yuji Morohashi¹, Atsushi Osawa¹, Sadayuki Watanabe² (1. Tokyo Metro Co.,Ltd., 2. Metro Rail Facilities Co., Ltd.)

Keywords:box type tunnel, chloride damage survey, chloride ion concentration, reinforcing bar corrosion grade