MiamiCuse wrote:
I have opened up some holes in the concrete block walls during my
electrical and plumbing projects, most of them the size slightly
larger than electrical boxes but some bigger.

I have decided that for the holes that are above the slab, I will use
those foamy GREAT STUFF products to just fill the gaps.

For holes that are on the wall but below the slab (my floor slab is
about 24" above grade) whether it may be above grade or below grade, I
will fill with some slurry mix or sand topping mix. The question I
have is how do I do this?

If I have a rough hole about 4"x4" in the block wall, a 3" pipe runs
through it, now I have narrow space of 1/2" more or less around the
edge of the pipe. How so I push or pack those mix in? Do I mix it
dry and push it in as much as I can with a stick? Does not think this
will create any uniform patch. Or do I mix it very wet and put it in
some sort of a cone with a small nozzle and try to force it into the
hole, sort of like how pastry chefs put cream in a paper cone and
squeeze them out to make patterns?

Thanks in advance,

MC

You might want to try latex stucco patch for small, non-structural
spots. It comes plain and sanded, already mixed. We used it around our
condo prior to painting to patch chinks, broken-away chunks around dryer
vents, etc. Even used it for "mortar", along with concrete pavers, to
fill the base of a recessed opening where an old, rusted
fire-extinguisher cabinet had been. It shrinks a little bit, so where
we "mortared", we applied 2 or 3 more light coats to fill the lines
between blocks and make them look like the rest of the textured stucco
finish. After painting, can't tell we did the work, and it has lasted
fine for 8 years since. It would also allow a little flex around your
pipes. Very easy to work and to clean up.