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www.quora.com/What-causes-rust-to-form-on-concrete

Another common source of rust is the reinforcing bar in concrete slabs and structures. If the rebar is carelessly placed in the concrete so that it is close the surface, water will get in there and the rebar will rust, expanding as it does so. This causes pressure on the concrete and can cause big flakes of the concrete to break out.

www.wikihow.com/Remove-Rust-from-Cement

How to Remove Rust from Cement. Rust stains on cement are a common problem for homeowners, especially those who use well water, as it is common for well water to contain high levels of iron. Such stains are difficult to prevent and can...

www.vicmix.com.au/site/DefaultSite/filesystem/documents/Rust...

Rust Coloured Stains on the surface of Exposed Aggregate Concrete What is causing the Rust Coloured Stains There are a multitude of causes that can result in Rust Coloured Stains on the surface of concrete. This document deals specifically with rust coloured stains created by “Ironstone” on the surface of Exposed Aggregate Concrete.

www.quora.com/What-causes-cement-to-rust

Cement does not rust, neither does concrete. The only thing that rusts is the steel reinforcement in the concrete. Due to rusting of steel, its volume increases which causes cracks in concrete and the whole structure is compromised.

civildigital.com/spalling-concrete-causes-prevention-repair

Spalling of Concrete – Causes, Prevention & Repair ingress of moisture of air into concrete causes corrosion of reinforcement and results in the volume expansion of steel bars, consequently causing cracks & spalling of concrete cover. The word Spall in engineering, describes the chips or fragments of a material that is broken off a bigger object.

www.tipsbulletin.com/how-to-remove-rust-stains-from-concrete

The acid reacts with the rust, which causes it to dissolve. How to Remove Rust Stains from Concrete Garage Floor. Garage floors are notorious for attracting stains, from mud and oil to grease and rust. While you can learn how to remove oil stains from a concrete garage floor here, removing rust from your garage floor and concrete takes a small ...

www.concretecorrosion.net/html_en/mecanism/contenu.htm

Corrosion with rusting of reinforcement in concrete comprises two stages. In a first stage (or step), the aggressive elements, such as chloride or carbon dioxide (CO 2) (Cl-), present in the surrounding medium, penetrate in concrete.This is the initiation stage.

www.contractortalk.com/f83/rusting-concrete-110995

The following is the 8 most known concrete issues which use to identify the problem, the cause and the remedy for repair. I specified everything it said for your particular issue, and today is not your lucky day for me to type everything out for the rest of the issues Sorry. So here it is, the 8th causes to identify the problem with concrete. 1 ...

www.concreteconstruction.net/how-to/preventing-rust-stains_o

Occasionally iron sulfide particles in the aggregate are at fault. Loose.iron or steel particles left in inadequately cleaned forms can also cause trouble, as can reinforcing bars too close to the concrete surface. Bar supports that weren't protected against corrosion can produce small rust stains in a recognizable pattern.

www.concreteconstruction.net/how-to/rust-stains_o

The other alternative is to use a concrete sealer on the exposed surfaces. Any of the major admixture companies can provide assistance in the use of these products. Also, be sure to check on the fertilizer that the people use. Some fertilizer includes iron, and when the granules get wet on the concrete they leave rust spots.