Freezing resistant cement based stress sensor element

A stress sensor, cement-based technology, used in instruments, measuring forces, measuring devices, etc., can solve the problems of poor frost resistance, easy to be damaged, affecting the service life and measurement accuracy of cement-based stress sensors, and achieve good resistance. Freeze resistance, improved durability, and the effects of sharp changes in pressure-capacitance characteristics

Inactive Publication Date: 2010-12-15
UNIV OF JINAN
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the cement-based stress sensor has poor frost resistance and is easily damaged under repeated positive and negative temperatures, which affects the service life and measurement accuracy of the cement-based stress sensor, the invention provides a frost-resistant cement-based stress sensor element

Method used

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  • Freezing resistant cement based stress sensor element
  • Freezing resistant cement based stress sensor element
  • Freezing resistant cement based stress sensor element

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Experimental program
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Embodiment Construction

[0021] Table 1 Properties of 42.5 rapid hardening early strength calcium sulfoaluminate cement

[0022]

[0023] Table 2 Chopped Polypropylene Hydrocarbon Fiber Performance Parameters

[0024]

[0025] Table 3 Performance parameters of carbon nanotubes

[0026]

[0027] The weight percent of each mineral phase system in the calcium sulfoaluminate cement clinker of table 4

[0028]

[0029] Prepare calcium sulfoaluminate cement, chopped polypropylene hydrocarbon carbon fibers and carbon nanotubes with physical and chemical properties as described in Table 1, Table 2, Table 3 and Table 4 to make 4 groups of frost-resistant cement-based stress sensor elements.

[0030] Chopped polypropylene carbon fiber is cleaned and dried, and a certain proportion of chopped polypropylene carbon fiber is added to the methyl cellulose solution, stirred with a glass rod to ensure that the chopped polypropylene carbon fiber is completely dispersed; at the same time, carbon nanotubes a...

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Abstract

The invention relates to a sensor element in the technical field of detection, in particular to a freezing resistant cement based stress sensor element, which comprises a test block and a pair of electrodes. The electrodes are respectively positioned on the upper surface and the lower surface of the test block, and the test block comprises a cement substrate and electric conductive fibers uniformly distributed in the cement substrate; and the cement substrate is made of calcium sulphoaluminate cement mortar, and the electric conductive fibers comprise short-cutting polypropylene hydrocarbon fibers and carbon nano tubes. The invention has the advantages that:1. by adopting calcium sulphoaluminate cement as the cement substrate, the stress sensor element has favorable freezing resistance with the application range broadened to the temperature below a freezing point; and 2. besides doping with the carbon fibers as functional bodies, the carbon nano tubes are introduced simultaneously, therefore, the sensor has sensitive changes of pressure-volume characteristics with stable data.

Description

technical field [0001] The invention relates to a sensor element in the technical field of detection, in particular to a frost-resistant cement-based stress sensor element which is used for monitoring changes in compressive stress of concrete structures, can be integrated with large-volume concrete, and has good frost resistance. Background technique [0002] Many large-scale building structures in the field of civil engineering are large in scale and complex in structure, and their service life is as long as decades or even hundreds of years. During its service, due to the influence of adverse factors such as environmental load, fatigue effect, corrosion effect and material aging; at the same time, repeated changes in ambient temperature, such as freezing and thawing, humidity and drying, or heating and cooling, etc., will cause temperature The gradient will cause damage to the building structure, and the structure will inevitably produce damage accumulation, resistance att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/14C04B28/36
Inventor 王守德芦令超黄世峰常钧叶正茂周宗辉程新
Owner UNIV OF JINAN
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