Compatible Datum Temperature and Activation Energy for Concrete Maturity

作者：Lee Chang Hoon^*; Hover Kenneth C

来源：ACI Materials Journal, 2016, 113(2): 197-206.

DOI：10.14359/51688639

• activation energy
• concrete strength
• datum temperature
• mathematical modeling
• maturity
• physical chemistry
• temperature effects

Maturity methods are used to predict strength or other mechanical properties of a concrete mixture for a given moisture availability as a function of time and temperature. Temperature sensitivity of a mixture is characterized by datum temperature for the Nurse-Saul (NS) method, and by activation energy for the Freiesleben-Hansen and Pederson method (FHP). While these methods and their defining parameters were independently developed, the parameters are nevertheless interdependent, as a change in a concrete mixture that affects temperature sensitivity as expressed by datum temperature will also be reflected in a change of activation energy, and vice versa. This paper addresses the temperature- and mixture-dependent relationship between datum temperature and activation energy, using both a closed-form equation based on chemical kinetics and experimental data where values of datum temperature and activation energy were found to provide the best fit to strength data. Best-fit results validate the closed-form solution.

• 出版日期2016-4