Investigation on the Relationship between Highest Fire Temperature and Change of Microstructure in Concrete

The blocks are made with C40 concrete and tested in the specified temperature curve. The thermocouples are used to measure the temperature field of the internal blocks. After fire test, the samples derived from different locations of the concrete block are observed in the scanning electron microscope (SEM) and analyzed by X-ray diffraction (XRD) to extrapolate maximum temperature of the samples. The temperature extrapolated by SEM and XRD is in good agreement with the temperature measured by thermocouples. This proves it is feasibility that the maximum temperature of the concrete beam, column, wall and other components after fire extrapolated by SEM and XRD, which can provide reliable data to support Post-disaster assessment work.