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-   -   do not use concrete filler to fill stones... (

KUIPORNG 08-29-2008 03:15 PM

do not use concrete filler to fill stones...
Here is the story, I put stone caps on AB junior... some of the caps got small gaps... I fill them up with grey concrete filler... all looks good, espeically on sunny day... the color of the concrete is almost identical to the color of the concrete filler....

well... the terror story is when it rains....

so the real concrete color become darken... the concrete filler remains light... so all the concrete filler looks like heighlighter shows up well when it rain...

so my patio is now looks perfect on sunny dry day... looks strange on rainy days.....

I shouldn't have listened to my wife using concrete filler as she like the color... I would have use polymeric sand to fill the gaps instead....

DangerMouse 08-29-2008 03:20 PM

live and learn, right? i never listen to my wife.


stardell 08-29-2008 03:32 PM

If you get the learning part right, then you'll always listen to your wife, I do.

DangerMouse 08-29-2008 03:56 PM

well, if you'd ever seen MY wife's idea of a repair, you'd know why i don't. bubble gum and duct tape only goes so far when mending a goat fence. roflmao

concretemasonry 08-29-2008 04:16 PM

Were the caps real stone or AB caps?

If you look at the Allan Block instructions, you will find it is a segmental wall and not a rigid wall. With something on a non-rigid base, you never use mortar, because the units must NOT be rigidly attached.

Even if you were happy with the color of the mortar, you would eventually have cracks because mortar is too rigid and does not give. If the filler was non-cement based or had polymers/adhesive in it, it will always react differently to conditions and would change color differently. This is similar to the problems encountered with the wrong material between interlocking pavers.

You may be in a mild climate where things are really not tested. Where the SRW wall units and pavers were developed, the climate was more of test, so the recommendations are "bullet-proof" to work everywhere.

Polymeric will work as a passive filler for non-structural applications if the units are relatively light in color and do not show the long term whitish sheen after a year or so. Polymers are not forever when Mother Nature is around.

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