In construction engineering, concrete and steel bars are two indispensable building materials. However, over time, concrete rebar may develop problems such as rust, corrosion, and even burst the concrete in severe cases. In this case, how to carry out effective patching?This article will give you a detailed introduction to the repair method of rusting and bursting concrete steel bars.
1. Problem analysis.
The main reasons for the rust and bursting of concrete steel bars are as follows:
1.Unqualified steel bar quality: The steel bar contains too many impurities, such as phosphorus, sulfur, etc., which can easily lead to rust of the steel bar.
2.Insufficient thickness of the concrete protective layer: The insufficient thickness of the protective layer makes the steel bar directly exposed to the air and susceptible to corrosion.
3.High ambient humidity: In an environment with high humidity, steel bars are prone to chemical reactions with water, oxygen, etc., resulting in rust.
4.Concrete quality problems: The quality of cement, sand, stone and other materials in concrete is unqualified, which can easily lead to concrete bursting.
Second, the repair method.
In view of the problem of rust and bursting of concrete steel bars, the following repair methods can be taken:
1.Clean up the damaged parts: First of all, you need to clean up the concrete, steel bars and other debris in the damaged parts to prepare for the subsequent repair work.
2.Rust removal of steel bars: For rusty steel bars, rust removal treatment is required. Methods such as mechanical rust removal and chemical rust removal can be used to remove the rust on the surface of the steel bar.
3.Reinforcement: For severely damaged reinforcement, reinforcement treatment is required. Reinforcement materials such as reinforcement cages and reinforcement mesh can be used to wrap the damaged steel bars and improve their bearing capacity.
4.Concrete repair: For broken concrete, high-strength non-shrinkage grout can be used for repair. First of all, the grout is mixed with water in a certain proportion, then it is poured into the damaged part and compacted with a trowel to make it tightly bound to the original concrete.
5.Maintenance: After the repair is completed, it needs to be maintained. The curing time is generally 7 days, during which it is necessary to avoid the rapid evaporation of water to ensure the strength of the repaired part.
3. Precautions.
When carrying out the repair work of rusting and bursting concrete rebar, the following points need to be noted:
1.Before repairing, a comprehensive inspection of the damaged part should be carried out to ensure that there are no omissions.
2.Repair materials should choose qualified quality products to ensure the repair effect.
3.Pay attention to safety during the repair process to avoid accidents.
4.After the repair is completed, regular inspections are carried out to ensure the stability and durability of the repaired parts.
The above is the repair method of rusting and bursting concrete steel bars, I hope it will help you.
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