Freeze-thaw test equipment for simulating ultralow temperature-large temperature difference freeze-thaw process of concrete

Abstract

The invention provides freeze-thaw test equipment for simulating an ultralow temperature-large temperature difference freeze-thaw process of concrete, and relates to the technical field of freeze-thaw tests. The freeze-thaw test equipment for simulating the ultralow temperature-large temperature difference freeze-thaw process of concrete comprises a test cabin, a refrigeration compressor and a nitrogen supply device. The test cabin is used for placing a target piece for a freeze thawing test, and the refrigeration compressor is configured to reduce the temperature in the test chamber. The nitrogen supply device is configured to provide liquid nitrogen into the test chamber so as to reduce the temperature in the test chamber. The freezing and thawing test equipment for simulating the ultralow temperature-large temperature difference freezing and thawing process of concrete is provided with two cooling devices, namely the refrigeration compressor and the nitrogen supply device, and the refrigeration compressor and the nitrogen supply device are different in cooling capacity, so that different environment temperatures can be simulated, the simulated environment is closer to the actual engineering environment of a target piece; and therefore, the accuracy of the thermal performance test of the target piece is improved.

Description

technical field [0001] The present application relates to the technical field of freeze-thaw test, in particular to a freeze-thaw test equipment for simulating the freeze-thaw process of ultra-low temperature and large temperature difference of concrete. Background technique [0002] At present, concrete is the most widely used man-made building material. It has been widely used in engineering structures in various environments, and it is gradually applied in extreme environments such as ultra-low temperature. For example, as a concrete storage tank for liquefied natural gas, the temperature of liquefied natural gas is generally It is -165°C. When the liquefied natural gas is stored in the concrete storage tank, the temperature that the concrete storage tank can bear is about -165°C. When leaking, the concrete storage outer tank will experience ultra-low temperature - large temperature difference freeze-thaw and strong pressure change. The influence of this special environm...

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Problems solved by technology

[0003] However, the existing test equipment for the thermal performance of concrete storage tanks is difficult to simulate the extreme environment, which leads to a large difference in the conclusions of the only few researches on the evolution characteristics of the thermal performance of concrete in ultra-low temperature environments

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