In the 1890s, Yokohama became the first harbour to use concrete to build water breaks in Japan. This paper aims to clarify the supply and manufacture of concrete for such productions by analyzing the construction process of Yokohama harbour’s water break, which took place between 1891 and 1893. In this paper, the author considers the structure and civil engineering technologies of water breaks, infrastructure of concrete factory, construction process of concrete blocks and filling in (Bashozume) concrete, and the outcome and influence of Yokohama harbour’s water breaks.
