ANALYSIS OF THE THERMAL BEHAVIOR OF MASS CONCRETE BASED ON SEMI-ADIABATIC TEMPERATURE MEASUREMENTS

Abstract eng:
The combination of concrete’s low thermal conductivity with exothermic hydration and ambient temperature leads to thermal gradients in concrete. Consequently, tensile stresses develop, leading to early age cracking that may compromise concrete durability. Hence, the prediction of mass concrete thermal behavior is necessar y. Usually, this is done through FEM analysis in combination with adiabatic measurements of cement hydration. However, the use of adiabatic equipment is troublesome due to its high cost and lack of practicality. In that light, this work proposes a low-cost semi-adiabatic calorimeter setup. The measurements from this setup are used to adjust the parameters of an affinity hydration model. Next, the adjusted model is used as a basis for FEM thermal analyses of a mass concrete foundation block. Finally, the results from this analysis are compared against real scale measurements for validation.

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