I hate to bother the group with a piddly question. Nevertheless, experience
is better than experimentation.
I've got a small, 10x12' concrete patio. The concrete has a crack and a
slight uplift (maybe 1/4") on one side of the crack. I'd like to cover the
patio with something permanent with a view toward improving its looks.
I'm thinking along the lines of some sort of leveling material, but I don't
want it to subsequently go all cracky.
Great quote..... I'm going to use it in the future.
Or course, if you're getting paid for the experimentation & no
experience is available.... the whole process could be a lot of
But I digress.
A couple things can be done. But the first question is:
Is the crack active or is it done moving?
Did the crack occur at a saw cut or is it a jagged one?
If it is still active any applied covering (if non-flexible) will
crack too. :(
If the crack is done moving you could grind out the 1/4" step and fill
with a cemeotious patch.
I prefer a flexible self-leveling "grout", actually a Sika product
that comes in a giant caulk tube, Home Depot carries it.
You could also mud jack the slab but it's so small that an R&R might
A concrete pour of about 2 yds ($200?) would get you into the 5" depth
I'd use #4 bar, both ways, at "bigger than boot size" spacing (like
15" or 16").
In SoCal, this slab would never crack (BTDT).
When we "backhoe'd" the slab out for a lab expansion 5 years later,
the slab (12 x 15) came up as a solid flat plate and had to be
jackhammered to break it. :)
Depending on your local soil & weather YMMV.
The slab might settle or heave but it won't crack.
Hadn't thought of a grinding activity. That's an excellent idea.
I considered taking up the existing slab and starting over. The difficulties
with this approach seemed to be:
* A 200-curseword job and a lot of sweat to break up the existing slab,
putting one hunk per week in the trash pickup
* As you computed, about 2 yards but commercial deliver for that small
amount is problematic. That means (mumble-mumble, carry the 3) about 67 bags
of ready-mix. At 80# each, that's 5,300 pounds and ten or so trips to HD.
I really don't think the crack is worth that much effort! If the grinding
technique you suggested doesn't work out, I'll just cover it with a rug...
* Last year I scored about 800' of ceramic tile for free from a Craigslist
ad. The dude had a lot of his house done with this stuff and his slab
foundation began to crack and heave, resulting in tiles popping loose and
cracking themselves. His solution, and you're not going to believe this, was
to remove the tile and install carpet !
* Just two days ago, I scored a Craigslist concrete mixer for $90. It's a
IMER Minuteman. BIG sumbitch. Handles 5 cu ft at one gulp and retails for
about $650. Any ideas on how I can remove the concrete droplets and blobs
sticking to its various external legs and such? I'm thinking wire wheel in
an angle grinder.
Totally agree with your assessment.
A lot hard work to get rid of a crack that may not warrant the level
of effort. :(
In my area of SoCal you can get a "transit-mix" trailer in 1 or 1.5 yd
We also have site-mix trucks that will, using on board dry materials,
mix just the amount you need.
You can also look into getting the leftovers from a larger pour.
Unfortunately, 1.85yds is very small as a delivered load, the smallest
load we ever bought was 3 yds, even if we need less.
But 1.85 yds is too big for a single "leftover".
Often time a concrete mixer's "volume" will be spec'd based on total
volume, no "mixable" volume.
Typically they can only mix ~2/3 of the stated volume.
Not 100% sure but my calc for a 10 x 12 x 5" slab would require 85
bags (80 lbs) ......even more trips to HD.
I based this on 60# bag equals .44 cu ft.
This online calculator agrees..
I have a rule, well, more of a guideline......more than 1/2 yard =
Stiff wire brush on angle will do the exterior slop.
Concrete in drum, use pool acid ~1acid to 4 water.
Follow with hammer (don't deform the drum) and grinder.
I've done the "poor boy" disposal trick....... it takes MONTHS to get
rid of any substantial weight. :(
And you've got 5000 lbs of concrete to get rid of...... at 200 lbs a
week, 1/2 a year.
That rug is sounding better & better.
1. Why bother removing "droplets and blobs"? If you have enough to
make it very heavy, or if some of the blobs are interfering with the
function of something you need to remove-- otherwise they are like
dust in your driveway.
2. a wire wheel probably won't help at all.
3. Hit them with a hammer if you really need to remove them.
It matters a lot more if it is gumming up the inside of the barrel.
For that a couple shovels of #2 stone and a few gallons of water---
run someplace out of earshot until it is all shiny.
Excellent idea regarding the rocks and water. Maybe I'll add some Muriatic
acid to the mix.
Regarding the dribbles of concrete, I want to clean it up and paint it (some
paint is already peeling with a patina of rust underneath). After my modest
couple of jobs, driveway repair mostly, I hope to sell it for more than
twice what I paid for it. Remember, the model is ~$600 new and I paid $90.
Know anybody with even a cheap-ass sandblaster you can borrow? Even
using dry play sand rather than expensive media, it should knock it
smooth with little problem, once you get the hang of the attack angle. I
stripped paint and heavy rust off the bottom of an old clawfoot tub that
way, that a farmer had been using outside as a stock tank for 20+ years.
My sister painted it green on the non-porcelain parts, and installed it
in the upstairs living room of the A-frame she was living in at the
time. (Too bad she left it behind when she traded in the husband...)
Steve and I should post pictures of ours.<g> Steve did post his
once--- this isn't ours, but they look like this;
Mine was $50 25 years ago and probably went for $500 new in 1950 or
so. It has iron wheels and a cast iron main pulley. There has
never been any sign of paint anywhere on it - yet despite having lived
out of doors most of its life there is little more than surface rust &
concrete on the exterior. I keep the [3 or 4] moving parts
greased up well, and use it every couple years. I've probably
mixed 30 yards of concrete in it all told-
What you are calling 'patina of rust' - I'd call the beginnings of a
beautiful friendship.<g>. Cement mixers are the roughest and
toughest of tools. After every job, hose them down good. Keep the
moving parts greased. If you missed a blob last time- bang it with
a hammer. I'd look askance at a guy who showed up with a shiny
mixer-- and I wouldn't buy one that has just been painted. [I'd figure
the seller was trying to hide something.]
But hey-- it *is* your mixer, and if it will keep you off of Usenet
for a few hours, it isn't a total loss.<G>
You probably ought to stabilize the slab first. Google concrete
staples, or, alternatively, you could just make your own from rebar
and set them with epoxy.
There are also carbon fiber staple kits...
You'll grind and/or cut a channel across the crack and glue 'er in.
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