Page - 1430 - in Book of Full Papers - Symposium Hydro Engineering

Fig.7 2017/7/25 Temperature data comparison between optical fiber and digital thermometer in 7#11 Fig.8 2017/8/4 Temperature data comparison between optical fiber and digital thermometer in 7#11 From Fig.7 and 8, optical fiber temperature measurement data and digital thermometer temperature data are different, but the difference is small. The relative error is within 1 ℃ between the two methods. Therefore, the optical fiber temperature measurement can meet the engineering requirements. 4.2. VARIATION OF TEMPERATURE INSIDE CONCRETE AT EARLY AGE Taking the unit 7 # 11 of Wudongde Dam as an example, the temperature Variation is analyzed with age at the starting point at downstream surface and the end point at upstream surface(Fig.9). During the construction period, the temperature of the dam is controlled by the cooling water. In order to facilitate the expansion of transverse joint, the cooling time is generally 2 to 3 days after the placement. Therefore, the change of concrete temperature is the result of the combined effect of hydration heat and cooling water. T/(℃) Tim e(2017/7/25) T/(℃) Tim e(2017/8/4) 1430