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Cement pavement internal crack monitoring system and crack width and position determining methods

A cement and cement-based technology, applied in measurement devices, electrical devices, instruments, etc., can solve the problems of inability to monitor micro-damage of pavement, lack of autonomy and hysteresis of monitoring methods, and achieve the goal of being suitable for large-scale promotion and application, reducing pavement Monitoring cost, method reliability effect

Active Publication Date: 2019-04-30
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above technical problems, the present invention provides a monitoring system for internal cracks in cement pavement and a method for determining the width and position of cracks, which solves the problems that the existing monitoring methods lack autonomy and hysteresis, and cannot monitor micro-damages inside the pavement

Method used

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  • Cement pavement internal crack monitoring system and crack width and position determining methods
  • Cement pavement internal crack monitoring system and crack width and position determining methods
  • Cement pavement internal crack monitoring system and crack width and position determining methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The ceramic micropowder, polyethylene and cement were mixed according to the mass parts of 60, 25 and 15 parts respectively, and a cylinder with a diameter of 10mm and a thickness of 2mm was formed by hot pressing, and the cylinder was the asphalt piezoelectric material. Among them, the hot pressing conditions are as follows: temperature 130°C, pressure 14MPa, time 2min; then the pitch-based piezoelectric material is subjected to polarization treatment, the polarization conditions are: polarization electric field strength 2.5kV / mm, polarization temperature 120°C, The polarization time is 15 minutes; the cement-based piezoelectric material and the copper plate with a diameter of 15 mm and a thickness of 3 mm are bonded together through conductive adhesive, and a silicone waterproof layer is applied on the outside.

[0055] Mix 20 parts of cement, 40 parts of epoxy resin, 20 parts of aggregate and 20 parts of mineral powder to form the sealing solution. Apply encapsulatio...

Embodiment 2

[0057] The piezoelectric intelligent aggregate prepared in Example 1 is evenly buried at the bottom of the cement surface layer at intervals of 1 to 1.5 meters, and the wire of the intelligent aggregate is extended to the outside of the roadway or road shoulder, such as figure 1 shown. Every two adjacent electrical smart aggregates are respectively electrically connected to a signal generator and a charge amplifier, and an oscilloscope is connected to the charge amplifier to form a monitoring system for cracks inside the pavement.

Embodiment 3

[0059] (1) Signal measurement when not open to traffic

[0060] When it is not open to traffic, the signal generator is used to transmit sine wave signals of different amplitudes to the cement-based piezoelectric intelligent aggregate, and the adjacent intelligent aggregate is connected to the charge amplifier, and the signal is transmitted to the oscilloscope to test the amplitude of the output signal. The results are shown in Table 1.

[0061] Table 1: Output signal amplitude when not in traffic

[0062]

[0063] (2) Signal measurement for 1 year after opening to traffic

[0064] One year after it was opened to traffic (annual average daily traffic volume is 4,000 vehicles / day), the signal generator is used to transmit sine wave signals of different amplitudes to the cement-based piezoelectric smart aggregate (consistent with that before it was opened to traffic), adjacent to it The smart aggregate is connected to the charge amplifier, the signal is transmitted to the o...

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Abstract

The invention discloses a cement pavement internal crack monitoring system and crack width and position determining methods. The system comprises a plurality of cement-based piezoelectric intelligentaggregates, signal generators, charge amplifiers and oscilloscopes; the cement-based piezoelectric intelligent aggregates are embedded in the bottom of a cement surface layer; every two adjacent cement-based piezoelectric intelligent aggregates are electrically connected with a signal generator and a charge amplifier, respectively; the oscilloscopes are connected with the charge amplifiers, and every two adjacent cement-based piezoelectric intelligent aggregates can transmit signal waves therebetween. The crack width in a pavement is determined by utilizing the change of the amplitude of signals output before and after pavement loading, and the specific position of the crack is determined based on the system. The method can reduce the pavement monitoring cost, is reliable, simple, convenient and rapid, and is suitable for large-scale popularization and application; and the accuracy of obtained crack sizes and positions is high.

Description

technical field [0001] The invention belongs to the technical field of cement pavement health monitoring, and in particular relates to a monitoring system for internal cracks in cement pavement and a method for determining the width and position of cracks. Background technique [0002] Cement concrete pavement is one of the main pavement structures in my country. Under the joint action of traffic load, natural environment and other factors, cement concrete pavement will have different degrees and types of diseases, and some diseases are difficult to detect, such as reflection cracks, voids at the bottom of the slab, etc. Over time, hidden diseases It is becoming more and more serious, and once it is discovered, it will require large-scale maintenance and repair, which will affect the performance and service life of the pavement. Therefore, effective and timely monitoring of hidden diseases of cement pavement is extremely important for scientifically taking maintenance measu...

Claims

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Application Information

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IPC IPC(8): G01B7/02G01N27/61
CPCG01B7/02G01N27/61
Inventor 纪小平陈云王朝辉蒋应军肖剑
Owner CHANGAN UNIV
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