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Old 10-18-2010, 10:52 AM   #1
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less than perfect looking expansion joints


i poured my walkway with concrete from a truck the other day. there were about 6 or 7 expansion joints that i cut with the Marshall tool for that purpose. but the problem was that the truck used VERY LARGE GRAVEL (i think blue stone) and it was really difficult to cut the joints without clipping big chunks of rock, which would F. up the line completely. so the joints look kind of ugly and not geometrically correct.

if i had used bagged ready mix from HD, that would not have been the case because the gravel there is MUCH FINER ...

let this be a lesson to all.

my question now is how to correct it. i have seen in the past people use some tar-like mix to fill in those joints. what mix would that be and does it come in caulk gun format ? i also sort of don't like the idea of water filling in those joints. before putting the caulk/tar, i also plan to grind it a little with a 4.5" grinder and a diamond blade.

thanks

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Old 10-18-2010, 05:44 PM   #2
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less than perfect looking expansion joints


w/o knowing what size rock was in the mix, expansion joint is placed against a form then you don't have a problem - place the sidewalk in sections,,, we never had a problem w/grooving contraction jnts ( different than expansion jnts ),,, normally expansion jnt is used for isolation jnts but there's no great harm done in a s/w,,, straighten 'em out w/.110" blade on a 4" grinder against a 1x6 straight edge,,, then backer rod & joint sealant.

' tar ' is applied hot - ' asphalt-rubber ' is applied hot - the machines to do that work are in excess of $20K,,, grab some sonneborn in the masonary section of your local apron store.

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if you hear it from a guy in the apron store, be VERY suspicious the mtl/method will work,,, when it time to build something together, they won't answer phones NOR help
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Old 10-18-2010, 05:51 PM   #3
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less than perfect looking expansion joints


thanks. what kind of backer rod & joint sealant ?
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Old 10-18-2010, 05:54 PM   #4
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less than perfect looking expansion joints


closed cell - apron stores won't have the size you need so you'll have to twist it to get it to fit,,, forget the product name just now but its the only sika jnt sealant in stock at the orange store
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if you hear it from a guy in the apron store, be VERY suspicious the mtl/method will work,,, when it time to build something together, they won't answer phones NOR help

Last edited by itsreallyconc; 10-19-2010 at 11:11 AM.
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Old 10-18-2010, 05:57 PM   #5
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less than perfect looking expansion joints


thanks sir
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Old 10-19-2010, 08:33 AM   #6
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less than perfect looking expansion joints


Quote:
Originally Posted by amakarevic View Post
i poured my walkway with concrete from a truck the other day. there were about 6 or 7 expansion joints that i cut with the Marshall tool for that purpose. but the problem was that the truck used VERY LARGE GRAVEL (i think blue stone) and it was really difficult to cut the joints without clipping big chunks of rock, which would F. up the line completely. so the joints look kind of ugly and not geometrically correct.

if i had used bagged ready mix from HD, that would not have been the case because the gravel there is MUCH FINER ...

let this be a lesson to all.

my question now is how to correct it. i have seen in the past people use some tar-like mix to fill in those joints. what mix would that be and does it come in caulk gun format ? i also sort of don't like the idea of water filling in those joints. before putting the caulk/tar, i also plan to grind it a little with a 4.5" grinder and a diamond blade.

thanks

Hey amakarevic, my name is George and I work for a Chicago area Home Depot. There are few simple steps on how to fix your control joints. First you can use a 4.5” grinder with a diamond blade and cut two straight lines approximately ” deep as close as possible along the sides of the control joint. Secondly chip out the middle section between the cuts with a flat chisel, and remember to keep consistent ”depth on your chiseled section. Finally finish off the concrete with a self leveling sealant such as Sikaflex or DAP Self-Leveling. Using this method will give you a new slightly wider rubber looking control joint with a straight lines. Hope that helps

Last edited by SteelToes; 10-19-2010 at 08:59 AM. Reason: clarify
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Old 10-19-2010, 11:13 PM   #7
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less than perfect looking expansion joints


"Less than perfect" an be fairly subjeive, so a picture or two would surely help.

On a side note, if you think tooling joints into large, or low-chert stone is hard, you should try "picture-framing" a slab with the same conrete.

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