Research on Methods to Improve Durability of RCD Concrete


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Title: Research on Methods to Improve Durability of RCD Concrete

Author(s): N. Suzuki, T. lisaka, H. Umehara and S. Shiramura

Publication: Special Publication

Volume: 170


Appears on pages(s): 1467-1486

Keywords: Concretes; durability; mix proportioning; strength; tests.

Date: 7/1/1997

At the early stages of development, RCD concrete often tended to be inferior in strength and durability to any other conventional dam concrete because RCD concrete had the properties of stiff consistency and lean mixture. In this research, a laboratory test was conducted to determine its optimum sand percentage, sand ratio and optimum mixture proportions in order to improve durability of RCD concrete. In addition, a field test was conducted to determine the optimum lift height and optimum compacting method. Furthermore, a new construction method was developed to improve durability of RCD concrete that any existing RCD concrete can be strengthened by casting one of the conventional types of dam concrete on the upstream or downstream slope of the dam. Hence the proposed method in combination with the recommended mixture proportions and construction method has enabled one to rebuild many of the dams and to keep then in serviceable condition for a long time.