Question:
In general, is there any disadvantage to "stiff" mixture? i.e. is it
less strong? does it bond less well to the surrounding masonry? etc.
Answer:
In general, the less water the stronger the mortar.
The properly cured bond is equally strong.
So what are the disadvantages?
If the mortar dries out too soon it will not properly cure. Stiff mortar is
it a higher risk of drying out. You can prevent this situation by
moistening the interior of the hole until it stops readily absorbing water
before applying the mortar. After applying the mortar you can spray the
finished surface with water from time to time to counteract the effects of
evaporation. Stiff mortar is also harder mix, harder to compact, and harder
to smooth.
"Jeffrey J. Kosowsky" wrote in message
...
"William Deans" writes:
1a. Yes, just about any mortar mix will work (for your purpose).
1b. Yes, there are different types-- but your applicatoin is not very
demanding.
If I were in your shoes I would purchase this product:
http://www.lowes.com/lkn?action=prod...0391-286-14115
QuikreteŽ 60 Lb. Mortar Mix
Item #: 10391
Model: 14115
$2.93 == It's the lowest cost.
2. Is there a pre-mix or is it better to mix up a dry batch?
You can purchase pre-mix products but:
a) they might not be "stiff" enough (see below).
b) they will cost more than $3
c) the product above you "just add water and stir"
3. Can I fill the whole hole (maybe 6 inch deep by 2 inches wide round
cylinder) at once or do you need to apply in layers?
don't apply layers -- it isn't necessary
4. Does it shrink or expand when it dries? (and if it does, how do you
keep it relatively level with the surrounding area?)
Yes, it shrinks!!! To control shrinkage and help keep the mortar level
with
the surrounding area you need to use a very "stiff" (dry) mixture. Do
not
mix it according to directions (into the "plastic" state). Instead,
make
the mix as dry as possible, but still wet enough that it doesn't just
fall
out of the void. You can use a board to pack in the mortar in tightly
and
level it. If you keep it dry you will have no issues keeping it level
with
the surrounding area. If you make it too wet you will run into
problems.
If you insist on making the mortar into a plastic state you will need a
way
to keep a board pressed up against the void until the mortar hardens to
keep
it level.
In general, is there any disadvantage to "stiff" mixture? i.e. is it
less strong? does it bond less well to the surrounding masonry? etc.
Hope this helps,
Very helpful!!!