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
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[0053] Example 1
[0054] The ceramic powder, polyethylene and cement are mixed according to the mass parts of 60 parts, 25 parts, and 15 parts respectively, and a cylinder with a diameter of 10 mm and a thickness of 2 mm is formed by hot pressing. The cylinder is the pitch 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 polarized, and the polarization conditions are: polarization electric field intensity 2.5kV / mm, polarization temperature 120°C, The polarization time is 15 minutes; the cement-based piezoelectric material is bonded to a copper plate with a diameter of 15 mm and a thickness of 3 mm as a whole through conductive glue, and a silicone waterproof layer is coated 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 a packaging liquid. Apply encapsulating liquid to th...
Example Embodiment
[0056] Example 2
[0057] The piezoelectric smart aggregate prepared in Example 1 is evenly buried at the bottom of the cement surface layer at an interval of 1 to 1.5 meters, and the wires of the smart aggregate are extended to the outside of the carriageway or the road shoulder, such as figure 1 Shown. Every two adjacent electric intelligent aggregates are electrically connected with a signal generator and a charge amplifier, and the oscilloscope is connected with the charge amplifier to form a monitoring system for internal cracks in the road surface.
Example Embodiment
[0058] Example 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 smart aggregate, and the adjacent smart aggregate is connected to the charge amplifier to transmit the signal 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 open to traffic
[0062]
[0063] (2) Signal measurement for 1 year after opening to traffic
[0064] One year after opening to traffic (annual average daily traffic volume is 4000 vehicles / day), the signal generator is used to transmit sine wave signals of different amplitudes to the cement-based piezoelectric smart aggregate (the same as when it is not opened), adjacent to it The smart aggregate is connected to a charge amplifier, transmits the signal to the oscilloscope, and tests the amplitude of th...
PUM
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