Abstract: Temperature of hydraulic concrete in service period is not controllable under the measures of early temperature control and later thermal insulation. To reduce the temperature gradient near a concrete surface and prevent temperature cracking, we develop a method for active control of hydraulic concrete in service period. We construct a temperature control system and examine the buried depth and spacing of its temperature control pipelines and its regulated temperature, considering temperature-humidity coupling in the regulation and applying a measure based on the principle of minimizing temperature-humidity strain. The results show active temperature control can effectively reduce the adverse strain caused by a sudden drop in ambient temperature. And the best temperature control effect and lowest temperature-humidity strain are achieved at a buried depth of 0.3 m, pipe spacing of 0.3 m, and a regulated temperature drop up to 36.5%.

Key words: Active temperature control, hydraulic concrete, temperature regulating pipeline, temperature and humidity strain