Now that you are a professor in the field of building fires in civil engineering please help me polish the following text to make it suitable for publication in SCI journals During building fires wate

During building fires, water and vapor overflow from concrete cracks and cover the concrete surface, thereby affecting its physical properties. In this study, we employed infrared thermal thermography to record the outer surface temperature of the ceiling during a fire test. The infrared thermography also detects the infrared radiation emitted by water and vapor, gradually changing the monitoring object from concrete to water as the outer surface of the ceiling becomes covered by water overflowing from cracks. Therefore, the parameters of the infrared thermography needed to be adjusted, specifically the emissivity of water and concrete, which is the parameter related to the measured object.

In the present study, we adjusted the emissivity in the infrared thermography when the crack of the ceiling was filled with water, as we were primarily interested in the cracking of submerged tunnels during fire. Fig. 5 illustrates the crack of the ceiling and water on the ceiling. At 35 minutes, the majority of the cracks in the ceiling were filled with water, and the emissivity in infrared thermography was adjusted to the emissivity of water (0.957) at this point. At 50 minutes, most areas of the ceiling surface had been covered by water.

It is important to note that the process of the concrete surface being covered by water was relatively slow, and thus, it was necessary to select an appropriate time to change the emissivity in the infrared thermography during the fire test. The emissivity of concrete in the infrared thermography was changed to the emissivity of water when the ceiling was gradually covered by water. The emissivity of concrete is 0.94, whereas that of water is 0.957.

In conclusion, the use of infrared thermal thermography during a fire test allowed us to record the outer surface temperature of the ceiling and detect the infrared radiation emitted by water and vapor. The adjustment of the emissivity in the infrared thermography was necessary to accurately measure the physical properties of the concrete surface as it became covered by water. The findings of this study can be useful in understanding the behavior of concrete structures during building fires and in developing effective fire safety measures.