Regular regular inspection report of Qingshuihe Pump Gate Traffic Bridge (using industrial endoscopy)
5th span 4#, 5# vertical crack on the west side of the plate beam
4th span 5# plate beam crack photo
Taking pictures of industrial endoscopes for disease analysis:
(1) Carbon dioxide in the air acts through the pores and calcium hydroxide in the concrete (chemical reaction) Ca(OH)2+CO2→CaCO3+H2O is converted into neutral calcium carbonate and water, so that this part of the concrete is The alkalinity becomes neutral, that is, the pH value is lowered, and the concrete is carbonized. When the protective layer is carbonized, that is, the alkaline protection is lost, the passivation film cannot be continuously formed on the surface of the steel bar, and when there is corrosive substance outside, the passage is passed. The capillary hole penetrates into the surface of the steel bar and rusts, thereby expanding the concrete protective layer.
(2) The cross-fracture and the fourth-span crack in the above figure are stress cracks, which are related to excessive loading.
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