In the first version of CEMHYD3D, curing could be conducted under isothermal or adiabatic conditions. In version 2.0, these capabilities have been augmented to include the possibility of curing that follows a user-programmed temperature profile, such as that employed in steam curing. The desired temperature profile is simply stored in a standard input file temphist.dat. This file, which must be created by the user before the execution of disrealnew, contains a line by line listing of the endpoints (low value and high value) for time and temperature describing a linearized temperature vs. time relationship. Times are given in hours and temperatures in degrees Celsius. An example datafile (for mild steam curing at 60 ºC during the first 24 h of hydration) is as follows:
0.0 4.0 25.0 25.0 4.0 5.0 25.0 60.0 5.0 24.0 60.0 60.0 24.0 28.0 60.0 25.0 28.0 10000.0 25.0 25.0
This file specifies that between 0 h and 4 h, the temperature is constant at 25 ºC, between 4 h and 5 h, it is ramped from 25 ºC to 60 ºC, etc. To use this option in version 2.0 of CEMHYD3D, the user simply selects option 2 when prompted to enter "Hydration under 0) isothermal, 1)adiabatic, or 2) programmed temperature history conditions" and the file temphist.dat will automatically be consulted during program execution.