Comparison of mathematical functions

Nurse-Saul functionFreiesleben Hansen & Pedersen, Arrhenius functionWeighted funcion
StandardASTM C1074ASTM C1074
EN 206-1:2002
EN 13670		NEN 5790
UsedNorth-AmericaEuropeEurope
Assumptions on strength development Linear function of temperatureExponential function of temperatureExponential function of temperature
Maturity index expressed asTemperature-Time factorEquivalent age at a reference temperatureWeighted maturity
Specific parametersDatum temperatureActivation energyWeighted factor