Since 2010, old concrete pavement of expressway in Korea has approached the design life or exceeded it. As a result, the amount of maintenance for various types of distresses has also been increasing. In addition, there is increasing a demand for improvement in riding quality due to poor roughness. In this paper, when applying a diamond grinding method (DG) to improve the functionality of aged concrete pavement, a program to predict the 3D road surface profile was developed. Two field tests were conducted for program verification, and the comparison with the existing program and equipment was performed. As a result of the evaluation, the predicted result of the program was very similar to those actually measured using the existing roughness measuring equipment, and the error of the two results was about 5%. As a result of the roughness prediction using the 2D road surface profile measured before DG construction, it was similar to the existing program ProVAL. Using the data obtained by the 3D profile measuring equipment, it is confirmed that the prediction of how the IRI of the road will change in 3D is possible. In the future, through supplementary algorithms and economic analysis modules, it is possible to provide a tool for efficient budget execution of road maintenance agencies.