Adiabatic Temperature Rise Model of Ultra-High-Volume Fly Ash Conventional Dam Concrete and a FEM Simulation of the Temperature History Curve

The adiabatic temperature rise model of concrete is very important in simulated computations of temperature field of mass concrete. A combination model from different kinds of function models of adiabatic temperature rise of concrete was proposed to fit the adiabatic temperature rise test data of Ultra-High-Volume Fly Ash Conventional Dam Concrete (UHVFACDC) to obtain a reasonable adiabatic temperature rise model. This model can improve a 3-D FEM simulation program for calculating the temperature field of a dam whose material is UHVFACDC (content of fly ash reaches up to 80%). The 1.2mx1.2mx1.2m large cubic specimen of UHVFACDC was tested to obtain the temperature history curve in the middle of the specimen. The temperature history curve obtained by the FEM simulation for the large specimen was compared with the tested one. The two results coincided to a substantial degree which revealed that the obtained model is valid. Thus, the temperature history curve of UHVFACDC can be achieved. This model can improve the precision of temperature field simulation for the dam. It provides the temperature history curve as input for the experimental study on temperature-stress testing machine test of UHVFACDC which is crucial for the evaluation of crack resistance performance at early age.