Abstract: Construction information such as the rolling quality and progress of roller compacted concrete (RCC) dam surface is transmitted in feedback mostly in traditional ways such as reports and pictures, which is not conducive to timely detection of construction quality defects and overall grasp of construction progress. This paper presents a solution method of fixed camera three-dimensional registration based on the Tsai two-step calibration method to realize the fixed augmented reality (AR) feedback of construction quality. And a mobile AR feedback expression method is developed for concrete placing progress information by using hybrid registration. We use the relational database and building information modeling (BIM) to interrelate construction quality information and construction progress information, so that a complementary added value of construction information is achieved. Through system development and engineering application, we show this coordinate mapping method has an error of no more than 0.5 m in the placing area and an average response time of 5.06 s, meeting the requirement of field construction. The construction progress feedback module based on mobile AR has an average frame rate of 29.55 for mobile phone use, and 96.17% of the time for the frame rate greater than 27, meeting the fluency requirement of field construction. Thus, our AR-based method provides on-site managers with multi-view construction information expression and feedback channels.

Key words: roller compacted concrete (RCC) dam, augmented reality (AR), three-dimensional registration, construction information value-added, construction information feedback