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-   -   Using two different kinds of concrete (http://www.diychatroom.com/f105/using-two-different-kinds-concrete-152232/)

simonb 08-01-2012 03:38 PM

Using two different kinds of concrete
 
I am filling holes in my basement concrete floor. When i asked for info at the hardware store the guy sold me "sand mix" concrete because it doesnt contain aggregate so it does a smoother finish. Makes sence! Problem is when i got home i noticed that I cant go over 2" with the sand mix.

So i was thinking i was going to get concrete with stone to fill up most of the hole up to maybe 1.5" then top it off right away with the sand mix concrete.

Is this a good idea?

tony.g 08-01-2012 04:35 PM

1 Attachment(s)
The mix seems about right, but just make sure you order plenty so that you don't run short. Always better to have too much concrete than too little, I say - you can always re-lay the drive or build a pool if you find you have a bit left over. Don't buy the stuff in bags either- that's for cissies.

simonb 08-01-2012 04:56 PM

I'm going to be ussing bags because the job is very small and at most I will need 4 bags total. Not worth getting a truck

tony.g 08-01-2012 05:00 PM

Quote:

Originally Posted by simonb (Post 979167)
I'm going to be ussing bags because the job is very small and at most I will need 4 bags total. Not worth getting a truck


Oh,...er, ok then.

simonb 08-02-2012 03:26 PM

Anyone else?

Is using 2 different concrete mix back to back with no dry time a bad idea?

concretemasonry 08-02-2012 03:37 PM

You can dump one type over the other while still wet and then finish. Also, use a rebar or broom handle before finishing to rod or blend the 2 layers together somewhat.

You do not dry out concrete because it takes moisture and time to cure and work together. Keep it damp for a while.

Dick

tony.g 08-02-2012 03:56 PM

After he's put the first layer down, would it help if he pressed some strips of expanded metal lath onto it, and then applied the top layer?

concretemasonry 08-02-2012 05:33 PM

Not much good and the metal lath may interfere with the two layers mixing and bonding together.

It is only a thin layer for leveling. For patching holes in a basement, just a normal concrete mix would be adequate, depending on the criterial for the finish.

Dick

stuart45 08-02-2012 05:53 PM

Floor screeds 3 inch thick of sharp sand/cement are put on top of 4 inch thick concrete floors here, although as Dick said you should be able to get a decent finish with normal concrete for a hole patch.

Mort 08-03-2012 12:14 AM

Yeah, I don't see a reason to use a sand mix. The whole rest of your floor has aggregate in it.


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