MICROSCOPIC EVALUATION OF OLD CONCRETE USED IN SEA-FORT NO.2 AT TOKYO BAY

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  • ANDO Yoko
    TAIHEIYO CONSULTANT Co., Ltd., Department of Instrumental Analysis
  • KATAYAMA Tetsuya
    TAIHEIYO CONSULTANT Co., Ltd., Department of Instrumental Analysis
  • SATO Tomomi
    TAIHEIYO CONSULTANT Co., Ltd., Department of Instrumental Analysis
  • NOGUCHI Takatoshi
    TOKYO BAY WATERWAY OFFICE, Kanto Regional Development Bureau, MLIT

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Other Title
  • 第二海堡に使用されたコンクリートの岩石学的評価

Abstract

Daini Kaiho is an artificial island constructed as a sea fort（No.2）at the entrance of Tokyo bay for the purpose of defending the capital of Tokyo in Meiji era. Construction started with mounding the foundation in 1889（Meiji 22）and completed by the installation of cannons in 1914（Taisho 3）, but they were substantially damaged by the Great Kanto Earthquake in 1923（Taisho 12）. Petrographic examinations, along with supplementary analyses for estimating concrete mix were made for concrete core samples from three structural members：joint filler of the stone seawall, encircling concrete wall of 27cm cannon, and the RC platform located at the center of the 27cm cannon, plus a new structure from Daini Kaiho（sea fort No.2）and one RC caisson from Daisan Kaiho（sea fort No.3）for comparison. As a result, it was found that infill of stone wall and the encircling concrete of 27cm cannon contained cement from the shaft kiln in the first stage of construction, while concrete platform of 27cm cannon contained cement from the rotary kiln rich in fine particles. Therefore, the last structure was supposed to have been replaced in the later Showa era. Thus, petrographic examinations revealed the detail of used materials and the construction date.

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