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Old 12-25-2016, 02:30 PM   #1
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Concrete mix bags


Finished a basement french drain and wanted to know what type of concrete to patch the trench. Planning on using normal quikrete from Home depot regular strength version. They have a crack resistant version which is more but if the regular is ok that is what I would use. Thanks.

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Old 12-25-2016, 04:07 PM   #2
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Re: Concrete mix bags


Standard Qiikrete works great for this.

One thing that I would do is to pin the patch to the rest of the floor.

Get several 1 foot 1/2 inch rebars, ( in the same section of the store), drill 6 inch deep holes in the sides of the trench in the floor, insert the re-bar in the holes, pour the patch to cover the rest of the bar, trowel the concrete smooth.

This stops any future lifting of the patch, in the case of moisture fluctuations.

You must have moisture, you are installing a drain.


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Old 12-26-2016, 05:59 PM   #3
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Re: Concrete mix bags


If you use the regular quikcrete, I'd plan on starting in the morning rather than afternoon, as the stuff takes forever to set and for the blead water to leave. Adding a little bit of straight Portland cement to each batch will help, along with hot water, and a few fans.

If the trench is against the wall, there may not be enough room to drill dowels.
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Old 12-29-2016, 08:29 AM   #4
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Re: Concrete mix bags


we don't dowel & we may install, on avg, 2systems/wk,,, we DO lay 6mm plastic sheeting on top of miradrain & 57 stone to prevent moisture from 'wicking' up into new conc

don't know how jo defines 'little bit' of portland but a quart of it can't hurt & will raise the compressive strength + cure a bit faster,,, we don't - generally our bldrs use 3,500psi conc for bsmnt floors,,, any std bag of ----crete will deliver that if mixed properly

hot wtr & fans are a good tip,,, never tried them as, once we're done w/bleedwater, we final finish & leave
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Old 12-29-2016, 12:42 PM   #5
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Re: Concrete mix bags


Don't make the mistake of absorbing all the too wet makes week concrete that you read on the net. Realize you don't have all the equipment the professionals have, like vibrators etc. to work stiff mixtures. For you job you'll need a slump that will flow into the nooks and crannies. If you plan on driving trucks on it add a quart of Portland / 80lb. bag.
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Old 12-30-2016, 07:07 AM   #6
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Re: Concrete mix bags


was fine with this response til i got to ' absorbing all the too wet makes week concrete that you read on the net. ' wuzzat mean ? ? ?

this, too - ' For you job you'll need a slump that will flow into the nooks and crannies. are we talkin' Thomas English muffins or a trench fill w/57stone surrounding 4" pipe & 6mm plastic on top for a vapor barrier ?

' driving trucks on it ' - where, in the guy's BASEMENT ?

Last edited by stadry; 12-30-2016 at 07:18 AM.
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Old 12-30-2016, 10:33 PM   #7
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Re: Concrete mix bags


Quote:
Originally Posted by stadry View Post
we don't dowel & we may install, on avg, 2systems/wk,,, we DO lay 6mm plastic sheeting on top of miradrain & 57 stone to prevent moisture from 'wicking' up into new conc

don't know how jo defines 'little bit' of portland but a quart of it can't hurt & will raise the compressive strength + cure a bit faster,,, we don't - generally our bldrs use 3,500psi conc for bsmnt floors,,, any std bag of ----crete will deliver that if mixed properly

hot wtr & fans are a good tip,,, never tried them as, once we're done w/bleedwater, we final finish & leave
Do you guys use a bonding agent? I've only done a few and I used bonding agent. Is that really necessary?
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Old 12-31-2016, 07:29 AM   #8
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Re: Concrete mix bags


it depends,,, IF you've used a diamond blade to create 1 side of the trench, yes, as that technique will often ' glaze ' the side of the cut,,, mechanical interlock ( chipping gun ) is preferred for that reason,,, bonding agents can't hurt,,, by the time we've washed up the floor & ready to place conc, the trench's side is wet,,, IF its dry, we wet it again & scrub in some conc paste,,, therefore a bonding agent's not necessary

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