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-   -   IS it normal for it to take over a week for concrete to dry? (http://www.diychatroom.com/f105/normal-take-over-week-concrete-dry-172542/)

Red Squirrel 02-21-2013 02:14 AM

IS it normal for it to take over a week for concrete to dry?
 
A week ago I poured some concrete over a new drain line I added leading to my sump pit. It's been probably over a week now, and while it has hardened, I can still scrape at it with my finger nail.

Is this normal, or should I start to worry it wont cure at all? I will admit I did not do the best job with this, all I had was a small bucket, and the bag just said to put 0.8 gal of water per bag, but I could not really measure with what I had so I was adding water till it seemed like the right consistency, and I could only do a small batch at a time so each time I poured it was probably not 100% the same consistency. I used some bags I had in my garage already, and it's parging cement, so maybe not the best for this but figured it should work ok, right?

Day it was poured:

http://gal.redsquirrel.me/thumbs/lrg-1560-dsc04909.JPG

Today: (guess I should have used the same camera, this one is taken with my phone)

http://gal.redsquirrel.me/thumbs/lrg...219_072630.jpg


Also does temperature have a big factor? Should I be pointing a heater on this with some fans? I normally have the thermostat programmed to around 13 degrees when I'm not home or sleeping.

chrisn 02-21-2013 04:32 AM

Being just a dumb painter, I would probably throw some heat and a fan on it.

13 degrees:eek:

stuart45 02-21-2013 05:41 AM

As OPC hardens by curing rather than drying I wouldn't bother with any extra heat.
We don't have the name parging cement here, but I'm guessing it may contain lime which slows down the hardening a bit. Old bags of cement also sometimes need extra OPC in the mix. Give it another week or 2.

stadry 02-21-2013 06:07 AM

conc doesn't dry, it ' cures ',,, while curing, its exothermic as its chemical reaction of lime & wtr produces heat

sounds like too much wtr so what's the worst thing that can happen ? you take it out & replace it :mad: next time use the right stuff - you can even buy it at the apron/vest stores - its called quikrete, sakrete, or pre-mix'd-krete-in-a-bag :thumbsup:

another guide - DON'T ADD TOO MUCH WATER :no: MEASURE the water, too :thumbup:

this thread's fun :yes:

chrisn 02-21-2013 07:01 AM

Quote:

Originally Posted by stuart45 (Post 1121486)
As OPC hardens by curing rather than drying I wouldn't bother with any extra heat.
We don't have the name parging cement here, but I'm guessing it may contain lime which slows down the hardening a bit. Old bags of cement also sometimes need extra OPC in the mix. Give it another week or 2.


said I was dumb:laughing:

oh'mike 02-21-2013 07:55 AM

13 Celsius = 55 Fahrenheit

Parging cement is a covering for an existing brick or concrete wall----it is not designed for use as a floor--

I suggest you remove that and use a concrete mix----

Red Squirrel 02-21-2013 05:40 PM

I was afraid of that... so think it's just going to stay this way and not cure at all? Since if it's just going to take longer, I'm patient and can wait... I guess I would not have to take it ALL out would I? I could just take a few inches and then just pour some proper concrete on top? The dirt I was able to just throw beside the house as it's just sand there anyway, but concrete, I don't really want to do that with, so I'd have no way of disposing of this. There's some excess that formed in blobs that I had just pushed to the side to pickup later, and it crumbled in my hands when I squeezed it just now, so I have a bad feeling I will in fact have to redo it all.

oh'mike 02-21-2013 06:33 PM

Something is wrong with that product-----it should have set up long ago----remove as much as you can---it went bad and may never set up----

Red Squirrel 02-21-2013 06:51 PM

Ok, that's what I'll end up doing then. Really I should have bought new from the start instead of taking my chances.

oh'mike 02-21-2013 07:49 PM

I have a problem storing powders-----the humidity here is high and they go bad in a few months-----


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