Infrared Thermography Analysis of Concrete Cracks During Fire Test

Yes, the grammar of the sentences is correct. During the fire test, the infrared thermography monitored the temperature of the outer surface of the ceiling, including the concrete surface temperature, the temperature of water and vapor overflowing from concrete cracks. It can be seen from the infrared images that the temperature at the concrete cracks is higher. The higher temperature at the cracks is due to the high temperature water and vapor overflowing from the cracks. The comparison between the temperature of water and vapor at the cracks obtained from infrared images and the temperature of the concrete surface measured by the thermocouple is shown in Fig. 14. At 30 min, the temperature of water and vapor at the concrete cracks began to rise slowly, and at this time the concrete surface temperature of the ceiling was close to the ambient temperature. At 60 min, the temperature of water and vapor at the concrete cracks rose rapidly, and rose to 82.8ﾰC in a short time. Then, the temperature of the water and vapor that overflowed from the cracks was maintained at a higher temperature. The temperature change of the ceiling surface monitored by infrared thermography was consistent with the macroscopic test phenomenon on the ceiling outer surface. At 27 min, it was observed that the water overflowing from the concrete cracks on the ceiling gradually increased, as shown in Fig. 5(a). At 58 min, boiling water vapor began to overflow from the concrete cracks on the ceiling, as shown in Fig. 5(d).