Experimental Study and Numerical Simulation for the Effect of Thermal Expansion Coefficient on the Behavior of Early Concrete

Abstract:

For the more accurate calculation of thermal strain, the change law of the thermal expansion coefficient of early concrete is studied. The change law of early concrete temperature and strain is obtained through the experiment. At the same time, the user subroutine, which to calculate concrete temperature and strain considering hydration degree theory, has been developed based on ABAQUS secondary development platform. And on this basis, The change models of different thermal expansion coefficients are used to simulate the experiment. The numerical simulation results show that simulation results with different thermal expansion coefficient change models are not the same. While the exponential decline change model of the thermal expansion coefficient fits the experimental results better.

Key words:early concrete; thermal expansion coefficient; temperature strain; experiment; numerical simulation; ABAQUS