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Replies
When you cut into a concrete structure there is always a risk and there are many ways to do it. I suggest you break out the exsisting concrete and exspose the reinforcing steel weld new steel to it and form your new shape and before you spray the new concrete put in a product called KUNI Seal that will exspand and seal the joints between the old and new. As a rule i cut a grove to hold the Kuni seal.
There are several other types of sealants of this nature in the market place but joining the steel by welding is the key to success.
Kiwi Norman
It has been a year. What did you do?
Rob Lane
Thanks Kevin, yes we use weldcrete all the time with simular prep as you. It was just suggested to me about this HB40 product, and wanted to see if anyone has experiences with it. Looks like we are both doing the right thing from lack of replies.
Cheers Grant
Not familiar with this product but have used the weldcrete for many years without any problems.
The key is to thoroughly clean the surface by removing any greases and oils with say Tri-sodium phosphate (if it's available) and then etch it with muriatic acid. Be sure to wash completely with water to remove acid and any loose concrete material.
We have done this when renovating when we may add a bench, step, swimimout, etc.. Repairing crumbling bond beams, and setting new coping.
Laticrete has some great products too. You may want check them out.