Afternoon All
I have an issue with my patio and handrail.
The Steel posts that were originally concreted into to the actual concrete slab have expanded with rust and cracked the concrete slab to a point where there are wedge shape gaps of concrete missing.
I was debating to fix the concrete and put new Stirrups in or replace the metal posts with new ones and/or recondition the old ones.
I have decided to go with replace the old ones / maybe reuse the old posts after cleaning and rust proofing.
The way I was going to do it was to clean the cracked area, drill horizontal holes into the slab and put in anchors. Then use expanding concrete to fill around and bond to these anchors and post.
The question I have is anyone have other ideas/solutions to fix the issue?

This is the expanding Concrete I am thinking of using.

These are the anchors I wa sthinking of screwing in half way to give the concrete something to bond to.

Another product Iwas considering but am heading towards the expanding concrete for strength.

First Crack/wedge

Second crack and wedge

I havnt cleaned the area up yet. One question is does anyone know what that yellow powder is? I will use a cold chisel to take out loose pieces of concrete, then drill and fix anchors and then put some right angled formwork (Never done that before) to hold the concrete mix in. Is there something you put on the timber/proper formwork material to make it non stick?

Old post before I tapped it out.

This is the rust and yellow powder? I thought maybe a byproduct of rust? Really dont know. There is another crack in another post but that has not expanded yet.