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Filling in concrete slabs MiamiCuse 06-04-2008
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Posted by MiamiCuse on June 4, 2008, 11:37 pm
OK after doing some major plumbing work, I have now four bathrooms and one
kitchen with holes of varying sizes to fill back with concrete.

The largest hole is 7' wide x 5' long by 4" thick, the smallest one is about
a 12"x12"x4".

I will be doing termite sprays, moisture barriers, and rebar ties for all
the big holes and throw in some wire meshes as well.

Now the problem is how to get the concrete into those holes.

Obviously the fastest way is to measure them off and calculate the yardage
and order the concrete to be delivered and wheel it in and fill them all in
one shot...but this makes me very uneasy.

I remember last time I did this, the concrete truck was very close to my
driveway, it spills all sorts of concrete into my driveway and stairway as
well as fence, took me a long time to clean them off. As the wheel barrow
fills up and gets wheeled to the individual rooms, they also spill and drip
and made a mess, and finally I don't think I can handle filling of 9 holes
in 5 rooms and smooth them fast enough...

I prefer to take it one room at a time and if I mess up I learn from my
mistake as I move forward.

So I think I will mix my own and pour at my own pace. I will need to rent a
concrete mixer (or may be cheaper to buy one if I have to rent for an entire
week).

question is for the large hole - 5'x7'x4" thick, I might have to mix several
times. So is it ok if I say divide it up, put may be a sheet of plywood in
between and pour in sections, do one, wait for it to dry in a day, and pour
another section...is that ok? I know this is probably not as strong as one
continuous pour in one single step but I don't think I can do enough fast
enough.

Would appreciate any thoughts and comments on what's the best way to attack
this.

Thanks,

MC



Radiant Heat 468x60
Posted by on June 5, 2008, 12:25 am
wrote:

>OK after doing some major plumbing work, I have now four bathrooms and one
>kitchen with holes of varying sizes to fill back with concrete.
>
>The largest hole is 7' wide x 5' long by 4" thick, the smallest one is about
>a 12"x12"x4".
>
>I will be doing termite sprays, moisture barriers, and rebar ties for all
>the big holes and throw in some wire meshes as well.
>
>Now the problem is how to get the concrete into those holes.
>
>Obviously the fastest way is to measure them off and calculate the yardage
>and order the concrete to be delivered and wheel it in and fill them all in
>one shot...but this makes me very uneasy.
>
>I remember last time I did this, the concrete truck was very close to my
>driveway, it spills all sorts of concrete into my driveway and stairway as
>well as fence, took me a long time to clean them off. As the wheel barrow
>fills up and gets wheeled to the individual rooms, they also spill and drip
>and made a mess, and finally I don't think I can handle filling of 9 holes
>in 5 rooms and smooth them fast enough...
>
>I prefer to take it one room at a time and if I mess up I learn from my
>mistake as I move forward.
>
>So I think I will mix my own and pour at my own pace. I will need to rent a
>concrete mixer (or may be cheaper to buy one if I have to rent for an entire
>week).
>
>question is for the large hole - 5'x7'x4" thick, I might have to mix several
>times. So is it ok if I say divide it up, put may be a sheet of plywood in
>between and pour in sections, do one, wait for it to dry in a day, and pour
>another section...is that ok? I know this is probably not as strong as one
>continuous pour in one single step but I don't think I can do enough fast
>enough.
>
>Would appreciate any thoughts and comments on what's the best way to attack
>this.
>
>Thanks,
>
>MC
>


The big hole is about 20 bags of concrete. That is a lot to mix if you
don't have help. 3 people can do it but they will stay busy.
One running the mixer, one wheeling and one placing the mud.
You are already going to have a cold joint on the edges I would try to
avoid another seam if you can.
"Stick and dowel" the slab with rebar. Drill holes into the existing
slab, epoxy the rebar in from both sides and lap it about 24" for #4
(1/2" rebar) or 18" for #3 (3/6") and tie it with wire. A 12x12 grid
is probably more than you need. 18x18 or even 24x24 should stablize it
You probably don't need anything in the small holes.

Posted by Duff2 on June 5, 2008, 8:08 am
wrote:

>OK after doing some major plumbing work, I have now four bathrooms and one
>kitchen with holes of varying sizes to fill back with concrete.
>
>The largest hole is 7' wide x 5' long by 4" thick, the smallest one is about
>a 12"x12"x4".
>
>I will be doing termite sprays, moisture barriers, and rebar ties for all
>the big holes and throw in some wire meshes as well.
>
>Now the problem is how to get the concrete into those holes.
>
>Obviously the fastest way is to measure them off and calculate the yardage
>and order the concrete to be delivered and wheel it in and fill them all in
>one shot...but this makes me very uneasy.
>
>I remember last time I did this, the concrete truck was very close to my
>driveway, it spills all sorts of concrete into my driveway and stairway as
>well as fence, took me a long time to clean them off. As the wheel barrow
>fills up and gets wheeled to the individual rooms, they also spill and drip
>and made a mess, and finally I don't think I can handle filling of 9 holes
>in 5 rooms and smooth them fast enough...
>
>I prefer to take it one room at a time and if I mess up I learn from my
>mistake as I move forward.
>
>So I think I will mix my own and pour at my own pace. I will need to rent a
>concrete mixer (or may be cheaper to buy one if I have to rent for an entire
>week).
>
>question is for the large hole - 5'x7'x4" thick, I might have to mix several
>times. So is it ok if I say divide it up, put may be a sheet of plywood in
>between and pour in sections, do one, wait for it to dry in a day, and pour
>another section...is that ok? I know this is probably not as strong as one
>continuous pour in one single step but I don't think I can do enough fast
>enough.
>
>Would appreciate any thoughts and comments on what's the best way to attack
>this.
>
>Thanks,
>
>MC
>
In the time you have spent worrying and writing about it, you could
have already have finished it.

Put your vapor barrier down and start the mixer and get busy. Each
time you dump a load, mix it in with the last load you dumped. It
won't dry and harden in the 30 minutes it takes to mix up another
batch, so you just keep mixing, dumping and stirring it in.




Posted by Jerry on June 5, 2008, 11:26 am

>
> I remember last time I did this, the concrete truck was very close to my
> driveway, it spills all sorts of concrete into my driveway and stairway as=

> well as fence, took me a long time to clean them off. =A0As the wheel barr=
ow
> fills up and gets wheeled to the individual rooms, they also spill and dri=
p
> and made a mess, and finally I don't think I can handle filling of 9 holes=

> in 5 rooms and smooth them fast enough...

Here in the Phoenix area, there are places where you can order small
batches of concrete in a dump-it-yourself trailer. Might work for you
if you or a friend have a truck with a hitch. Sounds a lot easier than
mixing the 20 bags that another poster estimated by yourself.

Jerry

Posted by on June 6, 2008, 8:39 am

> OK after doing some major plumbing work, I have now four bathrooms and one
> kitchen with holes of varying sizes to fill back with concrete.
>
> The largest hole is 7' wide x 5' long by 4" thick, the smallest one is
> about a 12"x12"x4".
>
> I will be doing termite sprays, moisture barriers, and rebar ties for all
> the big holes and throw in some wire meshes as well.
>
> Now the problem is how to get the concrete into those holes.
>
> Obviously the fastest way is to measure them off and calculate the yardage
> and order the concrete to be delivered and wheel it in and fill them all
> in one shot...but this makes me very uneasy.
>

You could also pump it in.

> I remember last time I did this, the concrete truck was very close to my
> driveway, it spills all sorts of concrete into my driveway and stairway as
> well as fence, took me a long time to clean them off. As the wheel barrow
> fills up and gets wheeled to the individual rooms, they also spill and
> drip and made a mess, and finally I don't think I can handle filling of 9
> holes in 5 rooms and smooth them fast enough...
>
> I prefer to take it one room at a time and if I mess up I learn from my
> mistake as I move forward.
>
> So I think I will mix my own and pour at my own pace. I will need to rent
> a concrete mixer (or may be cheaper to buy one if I have to rent for an
> entire week).
>

Small mixers are cheap now, look at the Husky at Home Depot for around $260.
I've done 20 yards so far with that Husky.


> question is for the large hole - 5'x7'x4" thick, I might have to mix
> several times. So is it ok if I say divide it up, put may be a sheet of
> plywood in between and pour in sections, do one, wait for it to dry in a
> day, and pour another section...is that ok? I know this is probably not
> as strong as one continuous pour in one single step but I don't think I
> can do enough fast enough.
>

You should able to do 5x7 in one pour, I've done 10x10 on a mixer with just
the wife and me. I have the mixer next to the form to dump the mix. Your
advantage is that its indoors and more time to work with before the concrete
sets up. How are you transporting all that concrete without screwing up the
interior of the house as wheelbarrows don't turn well in tight hallways.




> Would appreciate any thoughts and comments on what's the best way to
> attack this.
>
> Thanks,
>
> MC
>



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