Numerical Simulation of Temperature Gradients for the Mass Concrete Foundation Slab of Shanghai Tower

Abstract

Crack control remains a primary concern for mass concrete structures, where the majority of cracking is caused by temperature changes during the hydration process. One-time pouring is a useful construction method for mass concrete structures. The suitability of this method for constructing the Shanghai Tower's mass concrete foundation slab is considered here by a numerical simulation method based on a 6-meter-thick slab. Some of the conclusions, which can be verified by monitoring results conducted during construction, are as follows. The temperature gradient is greater in the vertical direction than in the radial direction, therefore, the vertical temperature gradient should be carefully considered for the purpose of crack control. Moreover, owing to cooling conditions at the surface and the cement mortar content of the slab, the temperatures and temperature gradients with respect to time vary according to the position within the slab.