FIBER OPTIC MONITORING OF TEMPERATURE DURING HYDRATION HEAT RELEASE PROCESS OF LARGE SLAB CONCRETING FOR SHIP LOCK

SONG Zhanpu, ZHANG Dan, FANG Haidong, SHI Bin, FEI Bing
① School of Earth Science and Engineering, Nanjing University, Nanjing 210046;
② Jiangsu Province Communications Planning and Design Institute Limited Company, Nanjing 210005


Abstract: This paper uses the Raman Optical Time Domain Reflectometer(ROTDR) and Fiber Bragg Gratting(FBG)to monitor the hydration heat of large base-slab concreting for ship lock. The base-slab is 14.8m wide, 29.2m long and 3m thick. The monitoring shows the following results. The peak temperature in core of the concrete block thick can reach 54.5℃at the 5th day after the concreting. The surface temperature can reach the peak temperature 46.7℃ at the 6th day. According to the monitoring results, a comprehensive analysis of concrete hydration heat release process is carried out to verify the feasibility of ROTDR and FBG to be used in monitoring the hydration temperature field changes during mass concreting. These results can provide reliable data for appraisal of safety and stability of the ship lock.

Key words: Concrete   Heat of hydration   ROTDR   Optical fiber sensing technology