This study verified the axial compression load-carrying capacity of concrete column members using normal concrete and recycled aggregate concrete to achieve a carbon-neutral and resource-recycling society in concrete structures. In addition, the axial compression load-carrying capacity of adhesive-applied PCM thickness increased column members using metal-grid verified as a reinforcing method for the assumed degraded damage. The proposed reinforcing method was a high-strength non-shrink mortar increasing thickness using 2 kinds of adhesive and metal grid. The experiment evaluated the axial compression load-carrying capacity of the existing RC column and the reinforced column members by an unconfined compression test. The result shows that the proposed reinforcing method increased the axial compression load-carrying capacity of RC columns using normal concrete and recycled aggregate concrete by 2.0 times due to the confined effect of the metal-grid. Therefore, the proposed reinforcing method can extend the service life of column members using normal concrete and recycled aggregate concrete without demolition and removal. Furthermore, the using recycled aggregate concrete is expected to contribute the reduction of CO2 emissions in a resource-recycling society for concrete structures.
