Device for measuring thermal conductivity of fireproof material at high temperature

Abstract

The invention discloses a device for measuring the thermal conductivity of a fireproof material at the high temperature. The device is characterized in that two low-temperature side core plates are arranged on the outer sides of two plate-shaped fireproof-material samples, the peripheries of a heating core plate, the periphery of the plate-shaped fireproof-material samples and the peripheries of the low-temperature side core plates are wrapped by heat insulating layers, heat conducting plates are located on the outer sides of the low-temperature side core plates, the heating core plate, the plate-shaped fireproof-material samples and the low-temperature side core plates are fastened into an integral structure through bolts, and then the integral structure is arranged in an electric furnace; a single-head heating rod in the heating core plate and single-head heating rods in the low-temperature side core plates are connected with a direct-current stable power source, and the direct-current stable power source is connected with a temperature regulator; thermocouples are connected with the temperature regulator, the temperature regulator is connected with a data acquisition instrument, and the data acquisition instrument is connected with a computer. According to the device, the thermal conductivity of the plate-shaped fireproof material such as a homogeneous material, a heterogeneous material and a multiplayer composite material in the direction of the whole thickness in the process from the room temperature to the high temperature of 800 DEG C can be measured.

Description

technical field [0001] The invention relates to the field of building fire performance design, in particular to a device for measuring the thermal conductivity of fireproof materials in high temperature. Background technique [0002] With the development of the times, the pace of urban construction is accelerating, the scale of modern construction projects is getting larger and larger, and the materials and technologies required for projects are becoming more and more complex. However, the current fire protection technical specifications cannot cover the fire safety requirements of all buildings. It is increasingly incompatible with the requirements of rapid social and economic development. Therefore, the country is vigorously promoting the performance-based design of building fire protection. [0003] The characteristic of building fire protection performance design is to determine its fire protection needs based on the fire development characteristics of specific building...

AI Technical Summary

Problems solved by technology

At present, the steady-state method is most commonly used to test the thermal conductivity of fireproof materials. The test results are relatively accurate, but the size of the specimen required for the test is large, the equipment is expensive, and the operation is cumbersome, and it can only test the thermal conductivity of fireproof materials below 100 °C.

Although transient methods such as the hot wire method and hot-line method can be used to test the thermal conductivity of fireproof materials at high temperatures, they cannot test the thermal conductivity of heterogeneous materials

In addition, the transient method can only test the local thermal conductivity of a homogeneous material, but cannot test the thermal conductivity in the direction of the overall thickness of the material, and the hot wire method and hot zone method test instruments are expensive

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