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-   -   Need feedback on parking lot I am doing. (http://www.diychatroom.com/f105/need-feedback-parking-lot-i-am-doing-181148/)

Dreaux 06-02-2013 07:32 PM

Need feedback on parking lot I am doing.
 
First off, thanks for letting me be here. Been lurking for a while, but know I really have some serious questions I can't find on google.

I have a huge parking lot at my business, enough for about 200 cars (all asphalt), The entrance is absolutely pulverized with potholes, so there is an area of about 1100 square feet i am excavating and redoing with concrete (reinforced 6" slab, 4,000 psi, with key joints every ten ft.

My question is on the keyed joints. I just poured 400 sq ft yesterday, and I used the keyed joints to screed on top with a 2x4. I used a bull float the trowel and finish broom. Now, about the keyed joints. They are covered up by like 1/16" of concrete +\- , I knew that before hand. I was also told before I did it, that there are zip strips that you put on top the joints and when it dries you pull them up and caulk the joints. But I could not find these zip strips ANYWHERE. so I just screeded over them. Today there is hair line cracks (like I would expect) all along the keyed joints.

Do I do anything? Should I chip them out and fill them? Get a pressure washer and expose the top of the steel? Just leave it alone?

Did I do the whole thing wrong?

Thanks ahead of time for any help I can find. Because apparently no one I can find can answer these questions.

Dreaux 06-02-2013 11:28 PM

Anyone? Going to chip up the top with a small chipping hammer and caulk it.

Thanks for the help.

stadry 06-03-2013 06:04 AM

keyed slabs or formed/saw'd jnts ? what're you building - a runway ? i'd leave 'em as is UNLESS you're extremely worried about appearance,,, however, IF you decide to do the work, use a joint sealant, not caulk :no: prep the jnt sidewalls properly & seal away,,, NO 3-sided adhesion worries BUT be sure the sealant adheres to the jnt sidewalls :thumbsup:

we'd use either sika self-leveling polyurethane ( apron/vest store ) OR self-leveling silicone ( dow-corning 888sl - const supply house ) good luck :yes:

jomama45 06-03-2013 08:59 AM

Next time use an edging tool next to the key form so you have a strong, dense, rounded edge that will wear better and need no work after the pour is complete. You can get edgers down to 1/4" radius (maybe even 1/8") if you want it to look more like a sawed joint to match the rest........

Dreaux 06-03-2013 05:53 PM

It's really no big deal. I just wanted to know if I did it wrong and if it was ruined. Talked to a guy that does this for a living in the plants (they use zip strips). He said get a chipping hammer (like a welder uses), clean it out and caulk it (when I say caulk I really mean joint sealant for concrete joints). It's going to crack up regardless. It's like 1/16" of mostly cream covering the top of they key joint.

Dreaux 07-14-2013 10:38 PM

Bump. I still haven't done anything. Figured I'd leave it, but after the slab dried, I have long cracks right over the key joints the whole way over all 4. I screeded on top the joints, I can't imagine it's more then 1/8-1/16 of an inch on top the joint. But I don't want water getting down there.

Should I just get my grinder with a diamond blade, cut some lines and seal it? Just get a chipping hammer and break all the weak point and seal?

What would you do? Just leave it?

beenthere 07-16-2013 06:20 AM

Moved to Concrete forum.

stadry 07-16-2013 06:30 AM

' still haven't done anything ' is what you should've done - nothing,,, the zip will prevent most of occasional water from penetrating,,, IF you're really worried, pull off the ' zip ' part & seal,,, shouldn't be any reason to use chipping gun :no: OR diamond blade

' long cracks right over the key joints the whole way over all 4 is what shouldda happened so you got that part 'xactly right :thumbsup:

Dreaux 07-19-2013 04:09 PM

Quote:

Originally Posted by itsreallyconc (Post 1216560)
' still haven't done anything ' is what you should've done - nothing,,, the zip will prevent most of occasional water from penetrating,,, IF you're really worried, pull off the ' zip ' part & seal,,, shouldn't be any reason to use chipping gun :no: OR diamond blade

' long cracks right over the key joints the whole way over all 4 is what shouldda happened so you got that part 'xactly right :thumbsup:

Thanks for the reply. I feel better about it now. There was no zip strip on top of these particular joints, and everywhere I asked said they didn't have them. Trying to make it look better would probably make it worse then. Thanks for the input. I'll leave it alone.

stadry 07-20-2013 09:32 AM

sounds as if ' they ' used the swimming pool style strips,,, think those were invented 'cause pool people are, largely, ignorant about conc :yes: you'll find traffic will wear away the paste on top of the strips exposing the white pvc to view so everything should look fine,,, just curious - did you ask @ a pro const supply house who specializes in hgwy stuff


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