And what not? But who cares what is in this concrete, because there is no access to air and moisture, which means that everything that gets inside the fill is sealed there forever (or for a couple of hundred years). What and who cares there for rusty fittings? Plus, concrete has an alkaline environment - it doesn't care about oxidized iron. Is it so? Or will rusty reinforcement in concrete give you an unpleasant surprise before you have grandchildren?
Read in the article
- 1 Is rusty fittings inevitable?
- 2 Strongly rusty or not very rusty - how to determine
- 3 What to do if the reinforcement is severely damaged by rust
Is rusty fittings inevitable?
The question arises naturally. Whichever construction market you come to - the metal lies in the open air, and its red heaps are noticeable far from the entrance.
Oxidation is a natural process that occurs with iron outdoors and under the influence of atmospheric moisture. To organize such conditions under which ferrous metal would not rust is an unaffordable luxury for most retail outlets. This is not just a canopy - it is dehumidification and a strict temperature regime that requires a large investment.
In other cases, fittings and pipes naturally "age", becoming covered with oxide deposits, first on the basis of building materials, and then on your site in anticipation of concrete work.
And if we look at this process through the prism of natural sciences, then where have you seen metals that are not subject to corrosion? Is it those that are from the category of precious?
Strongly rusty or not very rusty - how to determine
So, finding stainless steel fittings is almost impossible. How do you know if the degree of rust is threatening? In principle, this is not difficult. Take a regular album sheet and a hammer. Place a sheet under a piece of reinforcement and thoroughly walk over it with a hammer, sparing no effort.
Now look what happened. If nothing falls on the paper, there is no reason to worry. Rust is too thin and does not separate from the base, which means it has not penetrated deep into the metal.
If you nevertheless notice fine rusty dust and tiny grains, this is also not a problem. Moreover, experienced concrete workers will tell you that this light rust contributes to better adhesion to concrete, because the metal surface becomes vulnerable to the penetration of the cement mixture and sand.
If, during processing with a hammer, rust was poured abundantly and pieces began to separate, disfiguring the surface of the reinforcement, then things are bad.
What to do if the reinforcement is severely damaged by rust
Write it off completely? Well, why, such an armature can be used, but with one condition: it will have to be cleaned. How you do it - with a grinder with a brush or sandpaper - it doesn't matter. The main thing is to bring it at least to the condition.
That is, if you had reinforcement with a cross section of 12, after stripping it will be 10 or even 8. But after treatment with an anti-corrosion compound, you can lay the frame in concrete and from such reinforcement.
How to choose the right fittings and how to knit them - in this video:
What do you think about using rusty rebar? Share your opinion in the comments!
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