Intelligent spherical aggregate for concrete structure health monitoring

Abstract

The invention discloses an intelligent spherical aggregate for concrete structure health monitoring. As the size of a sensor is close to a coarse aggregate generally added in a concrete material, and meanwhile the sensor has a function of monitoring the health condition of a concrete building structure, the sensor can be called as the intelligent aggregate. The main body of the intelligent aggregate comprises a hollow spherical composite material particle, positive and negative electrodes, a packaging structure and a cable or a mini wireless transceiver, wherein the hollow spherical composite material particle is formed by compositing a PZT piezoelectric ceramic particle, cement powder, epoxy resin and the like; the positive and negative electrodes are formed at the inner and outer surfaces of the composite material particle; the packaging structure is packaged outside the composite material particle and is provided with an electromagnetic shielding layer; the cable or the mini wireless transceiver is connected with the positive and negative electrodes and the electromagnetic shielding layer. The intelligent aggregate can be buried in concrete in the construction process of the building structure to realize the long-term concrete structure health monitoring.

Description

technical field [0001] The invention relates to the field of health monitoring of concrete structures, in particular to a novel intelligent aggregate sensor for stable, long-term and comprehensive health monitoring of concrete structures. Background technique [0002] At present, most of the sensors used for health monitoring of concrete structures are sensors that require special procedures to be installed inside the concrete structure. The procedures often require that the corresponding sensors be installed at the same time when the structure is built, so advance planning is required. At the same time, because the design of these sensors is mostly disc or ring, the monitoring range has obvious directionality. Usually, in the area that deviates from the detection direction of the sensor at a certain angle, the monitoring sensitivity of the sensor will decrease significantly, so its detection "field of view is narrow". [0003] The application number is 201010607717.4, and ...

AI Technical Summary

Problems solved by technology

[0004] Furthermore, most of the sensors currently used for health conditions such as concrete structure crack detection are piezoelectric sensors based on the piezoelectric effect, but traditional piezoelectric sensors use pure ceramic materials such as PZT as transducer elements, and their acoustic impedance, elastic modulus The material parameters such as volume are quite different from the concrete material, so a large amount of acoustic signals are reflected at the interface between the concrete and the sensor, which reduces the sensitivity and accuracy of monitoring

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