For concrete core activation, your best bet is to use Construction:InternalSource coupled with ZoneHVAC:LowTemperatureRadiant:VariableFlow or ZoneHVAC:LowTemperatureRadiant:ConstantFlow. The example file "RadLoHydrHeatCoolAuto.idf" has a good example of how to set this up. For your specific application, I would make the following changes:

1. The Construction:InternalSource will reflect the concrete core construction
2. The SetpointManagers that control the PlantLoop Supply temperatures would reference your Schedule:File with the measured data.