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Cutting concrete Marc Britten 06-11-2007
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Posted by Marc Britten on June 11, 2007, 11:44 pm
For a medium sized job is it worth purchasing a moderately priced diamond
concrete blade vs an abrasive blade for cutting old concrete slab up?

There are a number of concrete blocks on my property, a few fairly long
that I need to break up.

I removed one of the smaller ones with an abrasive blade on my circular
saw. Scored it and then split it with a hammer/chisel. However that
wasn't very large and ate up the entire blade to slit it in enough places
to make the chunks manageable.

I guess I'm wondering how the life of a diamond blade is, and is segmented
better than continuous for old concrete.

AppliancePartsPros.com, Inc.
Posted by Bob M. on June 12, 2007, 1:22 am

> For a medium sized job is it worth purchasing a moderately priced diamond
> concrete blade vs an abrasive blade for cutting old concrete slab up?
>
> There are a number of concrete blocks on my property, a few fairly long
> that I need to break up.

If this is a one-time deal, why buy? Check out the local rental shop.
They'll have the industrial strength stuff you need.


Posted by BobK207 on June 12, 2007, 1:45 am
> For a medium sized job is it worth purchasing a moderately priced diamond
> concrete blade vs an abrasive blade for cutting old concrete slab up?
>
> There are a number of concrete blocks on my property, a few fairly long
> that I need to break up.
>
> I removed one of the smaller ones with an abrasive blade on my circular
> saw. Scored it and then split it with a hammer/chisel. However that
> wasn't very large and ate up the entire blade to slit it in enough places
> to make the chunks manageable.
>
> I guess I'm wondering how the life of a diamond blade is, and is segmented
> better than continuous for old concrete.

Marc-

Need more info.......how many inches (feet?) of cuts will you need to
make?

How thick are these blocks?

If it's just demolition why even bother with scoring.....just use a
repeated series of moderately heavy blows along the desired line of
fracture. Unreinforced concrete doens't stand up well to repeated
hammer blows & can be encouraged to crack.

I've broken more than my share of concrete slabs (patios, sidewalks)
without cutting.

If you insist on scoring & the amount doesn't justify renting, get a
Hilti, Bosch or DeWalt blade for your circular saw but be warned that
the mess & dust isn't too good for you or the saw.

I bought a 6" diamond blade YEARS ago when they were quite expensive,
I've bought others (4" & 4.5") since then. I've scored or cut
100's of feet with the 6" over the years.

The segmented ones clear the cut better but do not cut as chipfree as
continuous rim but for demo segmented is fine......

.btw wet is better than dry.................. less heat & dust but
still pretty messy.

cheers
Bob


Posted by Jim Elbrecht on June 12, 2007, 7:40 am

-snip-
>I bought a 6" diamond blade YEARS ago when they were quite expensive,
>I've bought others (4" & 4.5") since then. I've scored or cut
>100's of feet with the 6" over the years.
-snip-

Second that. The 6" will outlast your circular saw unless you hit
some rebar.

OTOH- check to see what it would cost to rent a gas powered 12-14" wet
saw for a day.

Or if straight edges aren't important, use a 20 lb sledge & sweat.
Get a bar under a corner of the slab & raise it a bit- slide a 2x4
under - and break away the overhanging pieces. Easier than you
think- especially if you have a helper- but I've done 6" thick 10' x
10' pieces of air-entrained concrete in a day- and I'm an old fart
with a bad back & weak heart.

Jim

Posted by EXT on June 12, 2007, 9:02 am
I have found it best to dig a hole under the slab and put a scissor type or
hydraulic car jack under it and lift an edge up, wedge something under it
and pound away. Even with re-bars concrete will break-up when it is
unsupported from underneath.


>
> -snip-
>>I bought a 6" diamond blade YEARS ago when they were quite expensive,
>>I've bought others (4" & 4.5") since then. I've scored or cut
>>100's of feet with the 6" over the years.
> -snip-
>
> Second that. The 6" will outlast your circular saw unless you hit
> some rebar.
>
> OTOH- check to see what it would cost to rent a gas powered 12-14" wet
> saw for a day.
>
> Or if straight edges aren't important, use a 20 lb sledge & sweat.
> Get a bar under a corner of the slab & raise it a bit- slide a 2x4
> under - and break away the overhanging pieces. Easier than you
> think- especially if you have a helper- but I've done 6" thick 10' x
> 10' pieces of air-entrained concrete in a day- and I'm an old fart
> with a bad back & weak heart.
>
> Jim



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