Concrete freeze-thaw expansion strain sensor

Abstract

The invention relates to a concrete freeze-thaw expansion strain sensor comprising a cement mortar ring body; temperature compensation fibers which comprise temperature compensation fiber coils which are arranged in the cement mortar ring body and temperature compensation guide fibers which are connected with the two ends of the temperature compensation fiber coils and extend to the outside of the cement mortar ring body; and single-mode bend-resistant bare fibers which comprise bend-resistant sensing fiber coils which are arranged in the cement mortar ring body and bend-resistant guide fibers which are connected with the two ends of the bend-resistant sensing fiber coils and extend to the outside of the cement mortar ring body, wherein the single-mode bend-resistant bare fibers and the temperature compensation fibers are arranged in a spacing way. The concrete freeze-thaw expansion strain sensor has great endurance and can realize life-cycle monitoring of the concrete structure by starting from the service period of the concrete of monitoring points until stripping of the protective layer of the concrete through the effect of multiple freeze-thaw cycles.

Description

technical field [0001] The invention relates to a sensor, in particular to a concrete freeze-thaw expansion strain sensor. Background technique [0002] Optical fiber sensing has many advantages such as good durability, high resolution, anti-electromagnetic interference, small size, and simple packaging structure. It is widely used in the field of building structural health monitoring. Optical fiber sensing is considered to be the most promising sensing technology for smart structures integrated inside materials to detect their damage. At present, this technology has been considered as an ideal sensing element for long-term safety monitoring of civil engineering structures. [0003] The durability of concrete structures in cold regions decreases as the number of freeze-thaw cycles increases. As an environmental load, freeze-thaw cycles are highly destructive to the integrity of concrete structures, and their destructive effects will be further increased when there is deici...

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Problems solved by technology

[0004] At present, the test of concrete freeze-thaw resistance performance in my country mainly uses prisms to perform several freeze-thaw cycles in a freeze-thaw machine. Qualitative description of the overall frost resistance of concrete cannot reflect the specific freeze-thaw damage of active concrete during the service period, let alone achieve the purpose of real-time monitoring

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