Quality control in Central Japan International Airport construction

Recently, a pneumatic flow mixing method has been developed for sea reclamation and land development, in which soft soil is mixed with a relatively small amount of stabilising agent in a transporting pipe. The soil mixture forms several separated mud plugs in the pipe, and is thoroughly mixed with the help of turbulent flow during transportation. This method was adopted to construct part of a man-made island for the Central Japan International Airport at the Ise Bay area in Nagoya. In the construction project, a total of 8.6 million m(3) of dredged soil was stabilised by the method for sea reclamation. During the construction, quality control and assurance of manufacturing the treated soil were carried out with an automated control system and laboratory tests on sampled soils. In this paper, the quality control system developed in this project and the quality assurance of the improved ground are described in detail.