Steel surface corrosion is more serious, how to deal?
The red-brown rust spots on the reinforcement shall be removed by manual or mechanical method. The wire rod reinforcement can be descaled by cold drawing or straightening process. The formed rebar and coarse rebar shall be derusted by special derusting machine. For serious corrosion, rust skin peeling, due to the pit. Spot damage section, should be degraded to use.
Steel bar surface corrosion is serious
1. Phenomenon: red floating rust appears on the surface of the steel bar, which turns dark brown after a long time, and even fish scales peel off.
2. Harm: the surface of the steel bar is seriously rusted, which affects the holding force between the steel bar and the concrete when pouring in the concrete. The development of steel corrosion will cause concrete to produce corrosion cracks.
3. Cause analysis: poor storage, erosion by rain and snow; long storage period; humid environment and poor ventilation.
4. Preventive measures:
(1) The formed steel bar can be applied to the surface of the steel bar with ordinary Portland cement mortar with a water cement ratio of 0.3~0.6, which has an anti-rust effect for 1-2 years. Before pouring, the mortar should be removed in principle.
(2) Steel bars shall not be piled up directly on the ground, and must be padded with things to make it more than 20cm from the ground: according to the weather conditions, rain cloth shall be covered when necessary; There are drainage facilities around the site and the terrain should be high. Try to shorten the stacking period, the first use of the advanced field.
5. Treatment method: the red-brown rust on the steel bar should be removed, which can be removed manually or mechanically. The wire rod reinforcement can be descaled by cold drawing or straightening process. The formed rebar and coarse rebar shall be derusted by special derusting machine. For serious corrosion, rust skin peeling, due to the pit. Spot damage section, should be degraded to use.
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