•An experiment to study nitrogen/steam flowing in concrete cracks in is presented.•Mass flow regulators and sensors accurately monitor fluctuations in the mixture.•Embedded thermocouples register fluctuations and phase changes in the crack. An experimental setup to study nitrogen/steam mixtures flowing through cracks in concrete is presented. Mass flow regulators placed upstream of an evaporator allow the flow rate to be controlled precisely while thermocouples and pressure sensors placed near the entry and exit of the cracks accurately monitor the pressure and temperature fluctuations as the mixture flows. Thermocouples embedded just below the surfaces of the crack provide details of the temperature fluctuations within the crack, which indicate the formation of condensation and transfer of heat to the concrete.