Temperature Control Measures and Temperature Stress of Mass Concrete during Construction Period in High-Altitude Regions

Figure 4

The formation of temperature gradient in concrete space and its corresponding temperature control process: (1) maximum elevation of the grouting subzone at the dam is 9 m; that is, a grout compartment is set every 9 m; (2) grouting zone: one grout compartment in which the longitudinal joints are grouted; (3) simultaneous cooling zone: when the grouting zone is located at the first grout compartment at the bottom of the restrained zone, the simultaneous cooling zone should consist of two grout compartments on top of the grouting zone. The other section should consist of one grout compartment on top of the grouting zone; (4) transition zone: one grout compartment on top of the simultaneous cooling zone; and (5) overlay zone: one grout compartment on top of the transition zone. (6) With the placement of concrete, four zones are gradually formed in the high direction. When the lowest area has reached the target temperature of the grouting zone, the four zones above are simultaneous cooling zones, transition zone, and overlay zone. Through the simultaneous cooling of the four regions, the mutual restraint and temperature stress are reduced.