Rear-arranged in-concrete reinforcing bar rust expansion strain monitoring device
A technology of stress monitoring and concrete, applied in the direction of measuring devices, electromagnetic measuring devices, measuring force, etc., can solve the problems of increased workload, poor efficiency, high cost, etc., and achieve the effects of low cost, reliable testing, and simple production
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Embodiment 1
[0034] Such as Figure 1 to Figure 5 As shown, the inner radius of the thick-wall support 1 is 42mm, the height is 7mm, and the wall thickness is 4mm. The circular column is made of 304 stainless steel, and its outer radius is 40mm, the height is 7mm, the wall thickness is 4mm, and the radius of the platform 8 is 36mm. , the height is 3mm, the wall thickness is 10mm, the length of the foil resistance strain gauge 3 is 55mm, and the width is 4.5mm. Glue-based terminals 7 are bonded to the ends, and insulated wires 6 are connected. Put the stainless steel ring column on the bearing platform 8, the bottom of the ring column and the surface of the bearing platform 8 are bonded with an adhesive, and the gap between the stainless steel ring column and the thick-walled support 1 is sealed with a waterproof sealant. Prevent the concrete from flowing into the gap when the concrete is poured, and the second is to avoid the internal pressure of the external PVC pipe on the resistance st...
Embodiment 2
[0037] The inner radius of the stainless steel ring column is 40mm, the wall thickness is 4mm, the height is 50mm, the tensile strength is ≥ 520MPa, and the diameter of the threaded steel bar is 10mm or 14mm. Mix C50 concrete with seawater, remove the base after 28 days of maintenance, and use the constant voltage method of external power supply to accelerate the corrosion of threaded steel bars. The voltage is 30V, and the current range is 0-5A. The method of connecting with the stabilized DC power supply accelerates the corrosion of threaded steel bars in concrete, and adopts the strain acquisition instrument 4 to collect real-time strain values, and the results are as follows Figure 7 shown.
[0038] Use the electrical acceleration method to accelerate the corrosion of threaded steel bars. When the rust spots accumulate to a certain extent, expansion stress will be generated on the mortar, causing the mortar to expand and deform. Once the mortar is deformed, the expansion ...
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