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In this study, the composition of concrete mixed with waterproofing agent was analyzed. Four specimens were prepared for the experiment and they were investigated through SEM-EDS analysis and X-ray fluorescence analysis. The research results are as follows. First, the most detected ions are four elements such as Ca, Si, Al, and Mg. There was no difference in component properties according to the amount of waterproofing solution. Second, there was a large difference in pores between concrete without waterproofing agent and with waterproofing agent, and the pore size of the specimen with waterproofing agent was relatively small. Third, as a result of SEM-EDS analysis and X-ray fluorescence analysis, the most common component in concrete was CaO, followed by SiO2, Al2O3, and MgO. The reaction between Ca ions and other Si, Al, and Mg ions was considered to be the main factor in the waterproofing effect by reducing the voids of concrete.