Manufactures of the conventional reinforced concrete segment involved the application of heavy vibrating compaction to concrete with an extremely stiff consistency. Focusing on one of distinctive features of high flowing concrete, that is self-compacting into the steel form, the authors developed and put into practice a new segment manufacturing system to rationalize the manufacturing process and equipment, as well as the simplifying steel form. This paper describes the adjusted mix proportion of high flowing concrete best suited for segment manufactures, the structure of the closed-type steel form that saves the surface finishing work on the back of segment, and the method of placing high flowing concrete. It also shows that this new type of segment proved to have an engineering performance equal to or better than the conventional one in various tests.
