Upon your site experience, how can we repair the defect on beam due to steel corrosion?
RC beam or steel one?if RC and steel is damaged seriously,the beam has to be strengthened with suitable method.while for steel beam if corrosion is serious some strengthening has to be used, if corrosion didn't affect the structural performance ,rust layer has to removed, then, using some protective coatings
Beam damaged due to corrosion can be repaired by many ways. One most common practice is strengthening by jacketing and plate bonding techniques. Currently advanced techniques like GFRP OR CFRP are also used for strengthening the damaged beams.
You may go through the attached article for modern techniques
Good answers, in addiction, in order to check the level of safety I would not prescind of making an overall count of the real stresses condition of the beam. This will make you more shure in the choose of the kind of intervent you need.
I'm shure you know what i mean.
I understand that you mean the concrete reinforcing steel bars corrosion. Source of corrosion should initially be defined and eliminated. Deteriorated and loose concrete , due to corrosion stress, should be removed to reach the reinforcing steel. Corrosion product -attached to the steel bars- should be totally cleaned reaching the steel sound surface. The capacity of the reinforced concrete element should be calculated based on the clean smallest cross section of the reinforcing bars. Different strengthening/rehabilitation techniques can be applied to retrieve the reinforced concrete element capacity. Jacketing, with micro-concrete, are usually applied with the suitable required reinforcement to regain the element's capacity.
You may go through this paper for all the available corrosion protection techniques:
Article A Review of Corrosion and Protection of Steel in Concrete
I'm looking for a good research in line with my field, civil engineering, with novelty, timely, and relevant. What research should i push through?
Following can be the methodology for the corrosion of steel rebars
1. Removing the source of corrosion but this is not possible every time for example in case of offshore structures. The corroded member may be removed and cleaned in such cases.
2. Strengthening of member may then be done.
3. The member can be jacketed for example by SIMCON.
4. If it is floor or roof, even covering can be used.
Deteriorated and loose concrete , due to corrosion stress, should be removed to reach the reinforcing steel then apply corrosive resistant then repair should be undertaken
For structural steel beams, in the first instance an assessment should be made of the loss of section of the member as corrosion will result in a loss of section and hence 2nd moment of area. If the loss of section is not significant the beam may still be able to carry the required load and the most appropriate solution would be to gritblast the corrosion away and replace the protective paintwork (this only applies to painted steel beams; gritblasting may be undertaken in order to measure the remaining section). If the loss of section is significant then the most appropriate course of action will be to strengthen the beam, usually by (following gridblasting and re-painting) applying a strenghting laminate to the beam soffit. The strengthening lamitate will usually be a composite material i.e. CFRP, GFRP, etc.
If the reinforcement bars corrodes, normally concrete spalling follows. The spall off concrete should be removed until 20 mm to 30 mm behind the bars. If the bars have been corroded too seriously (e.g. over 50% reduction in diameter), they should also be replaced. the hacked off part of the concrete beam should then be repair with repair mortar (for small areas) or grouting material (for large areas) with suitable strength comparable with the parent concrete.
You can use FRP sheet to beams, joining CFRP to beams. it lead to prevent the carcks at concrete beam.
Dear
The corrosion of steel bars requires the addition of more steel to the corroded section to retain the design area of steel. Steel jacket around the defected area could be a possile remedy.
Hello,
To solve this problem you can use any one of these strengthening techniques ( steel jacket, FRP, FRCM, SRG...etc.), knowing that, the spall off concrete should be removed and the steel bars should be totally cleaned.
Thanks
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