The present study aims to improve surface quality of tunnel lining concrete. The study developed an image analysis to detect and evaluate bugholes on concrete surface. The developed system calculates RGB value of colored images of concrete having bugholes. The study examines the accuracy and effectiveness by comparing the system to a binary image analysis. The comparative result shows that the developed system has higher accuracy than the binary image analysis. To examine generation of concrete bugholes, the developed system was employed in a vibrating consolidation test. The primary observation is that relatively small bugholes remained on concrete surface while large bugholes disappeared by vibrating consolidation.
