Wireless Monitoring System for Cracks in Cement Pavement and Method for Determining Crack Width and Position
A technology for internal cracks and cement pavement, applied in measurement devices, signal transmission systems, electrical devices, etc., can solve the problems of inability to monitor road micro-damages, lack of autonomy and hysteresis of monitoring methods, and is suitable for large-scale popularization and application. , The effect of promoting the construction of intelligent transportation and reducing costs
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Embodiment 1
[0067] Mix 55 parts of ceramic micropowder, 30 parts of epoxy resin and 15 parts of cement base, and form a cylinder with a diameter of 10 mm and a thickness of 2 mm by hot pressing to prepare a cement base piezoelectric material. Among them, the hot pressing conditions are as follows: temperature 130°C, pressure 14MPa, time 2min; polarization conditions: polarization electric field strength 2.5kV / mm, polarization temperature 120°C, polarization time 15min; the cement-based piezoelectric material and diameter The 15mm, 3mm thick copper plate is bonded together by conductive glue, and the upper and lower surfaces are respectively connected to the piezoelectric transducer with two wires, and the transducer is connected to the wire of the wireless signal transmitter; the outer surface is coated with a silicone waterproof layer.
[0068] Combine 20 parts of cement, 40 parts of epoxy resin, 20 parts of aggregate, and 20 parts of mineral powder to form an encapsulation solution. App...
Embodiment 2
[0070] This embodiment discloses a monitoring system for cracks inside a cement pavement, and the monitoring system includes the wireless piezoelectric intelligent aggregate and the wireless signal receiver of Embodiment 1. Cement-based wireless smart aggregates are evenly buried at the bottom of the cement surface at intervals of 0.7 to 1.2 meters, such as figure 1 shown. Radio signals can be transmitted between the cement piezoelectric smart aggregate and the wireless signal receiver.
Embodiment 3
[0072] Use the monitoring system of embodiment 2 to monitor pavement cracks:
[0073] (1) Signal measurement when not open to traffic
[0074] When it is not open to traffic, push a trolley with a specific load (100kg) along the driving direction at a constant speed directly above the smart aggregate. Under the action of the trolley, the i-th smart aggregate will produce a piezoelectric effect. The sensing module receives the signal amplitude V of the i-th aggregate i , and the results are shown in Table 1.
[0075] Table 1: Output signal amplitude when not in traffic
[0076]
[0077] (2) Signal measurement for 1 year after opening to traffic
[0078] One year after opening to traffic (annual average daily traffic volume is 4,000 vehicles / day), push a trolley with a specific load (100kg) at a constant speed along the driving direction and pass directly above the smart aggregate under the action of the trolley. The i intelligent aggregate will produce piezoelectric effe...
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