Experiment and Application on the Boundary Condition of Temperature Field for High Performance Concrete

During the construction of South-North Water Transfer Project in China, many structures are poured with high performance concrete. But the over standard stress caused by temperature always bring potential safety trouble. On the way to solve such problem, boundary heat transfer coefficient is the very important parameter. Two experiments are designed to get the parameters. One is the non-adiabatic temperature rising experiment of cubic concrete block whose six surfaces are covered with different thick polystyrene insulation board. Another is the pipe cooling experiment of rectangular concrete block whose surfaces are covered with different formworks and some insulation materials. Based on the experiment data, the inversion analysis is carried out with genetic algorithm to get the boundary parameter of these materials. The achievements are applied in the temperature control research of a large aqueduct, and no crack appears again. The conclusions also suggest the selection of thickness for insulation material and cooling pipe.