If the steel strand is improperly stored or used for too long, red rust will appear locally. According to actual experience, we can use "zinc easy to replace cold spray zinc" for secondary brushing to prevent this red rust. The treatment is very reliable from a technical perspective. The Tianjin prestressed anchorage is also very simple in actual construction. Today, I will follow the editor to understand how to deal with it in detail.
1. Remove the red rust on the surface of the short galvanized steel wire strands and bare red rust.
1. Use a soft emery cloth or sandpaper to lightly polish the exposed red rust part of the galvanized steel wire strand, so that the original steel body appears inside, and the polished part must not have red rust;
2. Treat the exposed red rust part of the steel wire strands with a rust-removing and anti-rust agent. Before treatment, a brush is also needed. After the rust-removing agent and the red rust on the surface have fully reacted, We have to wait until it dries naturally, and after it dries, a hardened film will form on the surface. At this time, we will carry out the coating work of "Zinc Easy to Replace Cold Spray Zinc".
3. If the red rust on the steel strand is relatively slight or moderate, usually only one step above is required. If there is more red rust and severe corrosion, it needs to be performed twice or more. We decide the number of specific treatments on site based on the actual situation. After all the painting is finished, we need to carry out the "Zinc Easy to Replace Cold Spray Zinc" coating work.
2. The coating work of "Zinc Easy to Replace Cold Spray Zinc" can be divided into two stages.
1. It is necessary to use CSZ0055 spray paint as a primer to spray the exposed part that has been treated before. The number and thickness of spraying need to be treated according to the actual situation. Generally speaking, the thickness should be kept at about 40μm. Up.
2, before using CSZ0055 spray paint, we should also pay attention to the point that we need to stir the product evenly before we can paint. In order to obtain a thicker coating, after the first coating is dried, we can apply another layer of CSZ0055 spray paint. After spraying twice, a coating of about 50~70μm can be obtained, and the service life is more than 18 years.
One thing to note is that when we paint the steel strands, we must pay attention to the uniformity of the spraying. There must be no leakage or sagging problems. We must ensure that the repair can be carried out more evenly. Under normal temperature conditions, we can wait 2 hours to spray again.