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-   Bricks, Masonry and Concrete (http://www.houserepairtalk.com/f17/)
-   -   What is the best way to hand float a small slab (http://www.houserepairtalk.com/f17/what-best-way-hand-float-small-slab-16485/)

MoreCowbell 09-19-2013 10:40 PM

2 Attachment(s)

Here are some photos. They don't really show much detail. One slab section is done curing and the new one is just about to get some plastic laid on top.
Attachment 5509
Attachment 5510

I have one question... On the second slab section I was not able to trowel the surface as smoothly as I did with the first one. I think I did everything the same. It seems like the aggregate in the concrete was right at the surface and was preventing a smooth trowelling. Instead I got a lot of pinholes.

I'm assuming that I did not float the concrete properly and the aggregate was not pushed down enough. I hit it with the wood float right after screeding, then with the aluminum float after the bleed water dried. Are there any tips or tricks to doing this?

Thanks.


MoreCowbell 09-19-2013 10:40 PM

2 Attachment(s)

Here are some photos. They don't really show much detail. One slab section is done curing and the new one is just about to get some plastic laid on top.
Attachment 5509
Attachment 5510

I have one question... On the second slab section I was not able to trowel the surface as smoothly as I did with the first one. I think I did everything the same. It seems like the aggregate in the concrete was right at the surface and was preventing a smooth trowelling. Instead I got a lot of pinholes.

I'm assuming that I did not float the concrete properly and the aggregate was not pushed down enough. I hit it with the wood float right after screeding, then with the aluminum float after the bleed water dried. Are there any tips or tricks to doing this?

Thanks.


MoreCowbell 09-29-2013 11:57 AM

1 Attachment(s)

Thanks BridgeMan. I just laid my 3rd slab section but I think I've gone from bad to worse (unrelated to my earlier problem). I think I know what I did wrong but I'm hoping to get some expert advice here before doing the next section.

I laid and wood floated the first two sections early in the day so that I was able to wait the 8 hours or so for the bleed water to dry so I can mag float it and then the finish troweling. Those sections came out fine aside from the slight gravely feel during the final troweling I spoke of earlier.

However, I laid and wood floated this 3rd section at night. I forgot about the time it takes for the bleed water to dry. So I stayed up as late as I could and mag floated and trowelled it only a few hours later while the surface was still rather soupy. The problem is that large portions of the surface are peeling off in paper thin flakes. Here is a picture (don't mind the wet appearance - I'm keeping it wet to cure it)...
Attachment 5560

I suspect that I trowelled too early and worked all that remaining moisture into the surface and weakened it. Is that right? Thanks.



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