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Abstract-Recently, as the problems such as lack of construction personnel and reduction of construction duration due to the increasing labor cost and aging labor personnel, the researches on the PC method have been reactivated. However, the purpose of most of these researches is to develop and structurally interpret the PC method, and there are not that many researches conducted from the perspective of the construction management. Accordingly, this research examines the composite method using hollow-PC column (hereinafter referred to as "HPC composite method") from the perspective of the construction management, and the purpose is to analyze the construction period of the HPC composite method. The differences per method are analyzed through the specific comparison of the construction procedures as well as the indepth interview with the expert, and the construction period of the HPC composite method is analyzed based on the analyzed differences. It seems that the construction In the HPC composite method, the construction period seems to vary depending on the column segment status. It seems that the construction period can be more effectively shortened through increasing the number of segmented columns. However, since the construction period relating to work types other than the PC method is not considered in this research, it is necessary to analyze the construction period relating to the overall construction process in the future.

Abstract-The purpose of this study is to find the basic characteristics of HPC consolidating concrete. The results are presented as follows: In terms of compression strength, the strength of BS mixed with Alkaline Activator (AA) was stronger than that of general BS. It is judged that Shrinkage Reducing Agent (SRA) considerably less influences compression strength. In terms of length change, the length of BS mixed with the AA changed smallest. It was found that the length change reduced further with the use of SRA.