## 6 Conclusions  
In this study, the effectiveness of conductive mortar on an SACP system was evaluated for an actual bridge structure. Basic property tests for the conductive mortar were conducted in the laboratory based on the criteria outlined in KS F 4042 for polymer cement mortar used in the maintenance of concrete structures. After installing the SACP system in the bridge structure, depolarization potential measurements and visual inspection were performed over four years to check the performance of the SACP system with conductive mortar. The results of the study led to the following conclusions:  
1. The conductive mortar satisfied the criteria for basic property tests. Although both the compressive and flexural strengths results measured up to 28 days tended to decrease with increasing admixture amounts, the test results ensured satisfactory quality for on-site construction for all proposed amounts of activated carbon. The conductive mortar demonstrated both basic properties and durability and secured effective performance for the intended application.
2. Through depolarization potential measurements, although the performance of SACP decreased slightly with time, SACP with conductive mortar showed superior performance to that with general mortar. Some partial protection was observed after four years; however, this does not mean that it is not protected at all. This is not thought to be a problem because the amount of depolarization can be changed depending on the specific resistivity of the concrete, such as rain, humidity, and weather.
3. Visual inspection of the test specimens with the CP system revealed no corrosion after four years, whereas significant corrosion was observed in the unprotected specimens. This additional confirmation indicates that the CP system operated well, even if there were some possibilities of partial protection in some columns.  
This study represents the first application of conductive mortar in Korea using the SCAP method. Over the course of four years and seven measurements, satisfactory CP performance was confirmed. The conductive mortar containing 5% activated carbon satisfied all the required criteria for electrical conductivity, durability, and other properties that the mortar should exhibit. Furthermore, it is anticipated that this conductive mortar can be applied to various fields beyond bridges, including harbors, dams, and underground structures, which will be investigated in future studies.  
Conceptualization, [PERSON]-[PERSON], [PERSON] and [PERSON]; methodology, [PERSON]-[PERSON], [PERSON] and [PERSON]; investigation, [PERSON], [PERSON] and [PERSON]; writing--original draft preparation, [PERSON]-[PERSON]; writing--review and editing, [PERSON] and [PERSON]; visualization, [PERSON] and [PERSON]. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
Data are contained within the article.  
Author [PERSON] was employed by the company Conclinic E&C Co., Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.