Embedded type ultrasonic sensor arranged in cement concrete structure

Abstract

The invention relates to an embedded type ultrasonic sensor arranged in a cement concrete structure. In the embedded type ultrasonic sensor, a front sound wave intensifier (2) is arranged in the middle part of a matching layer (1), and a PZT piezoelectric ceramic wafer (3) is arranged behind the front sound wave intensifier (2). A back lining layer (4) is arranged behind the PZT piezoelectric ceramic wafer (3). A packaging layer (5) is arranged on the periphery of the back lining layer (4). The PZT piezoelectric ceramic wafer (3) leads out an electric signal through a wire (7). The outlet endof the wire (7) is provided with a compression spring (9) and a tail-end wire protector (10). A shielding wire (6) is arranged on the outer layer of the wire (7). According to the invention, the prepared ultrasonic sensor is good in compatibility with the cement concrete. Meanwhile, the ultrasonic sensor is good in directivity, strong in signal strength and high in sensitivity. The packaging material is relatively good in waterproof performance and excellent in ageing resistance. The embedded type ultrasonic sensor, which has the same service life with the cement concrete, can be used for thelong-term and dynamic monitoring of the hydration hardening process of the cement concrete and the internal fracture damage monitoring of the cement concrete structure on active service.

Description

technical field [0001] The invention relates to the technical field of building material detection, in particular to an embedded ultrasonic sensor that can be used for monitoring the early hydration and hardening process of cement concrete, and for internal quality health detection or monitoring of cement concrete after hardening. Background technique [0002] As a non-destructive testing technology, ultrasonic is widely used in the detection of the internal quality of concrete structures. Traditional ultrasonic sensors are generally attached to the concrete surface after the couplant is applied to the emitting surface, and there is inevitably a coupling problem at the interface between the sensor and the concrete. In some specific occasions, such as narrow detection space, high-altitude operation, and special-shaped concrete structures without detection operation surfaces, etc., and for cement concrete structures that require continuous in-situ monitoring, the external sens...

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Problems solved by technology

Theoretically, the more tungsten powder is added, the better the backing layer can absorb clutter, but with the increase of tungsten powder, the mixture becomes more viscous and difficult to stir, and some bubbles are difficult to remove when vacuuming, which will cause the backing The layer cannot be evenly distributed inside, and it is difficult to form

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