Latest Discussions : Miscellaneous

Smithman

03:49AM | 01/31/03
Member Since: 01/30/03
1 lifetime posts
I had a driveway extension poured mid-December. Now at the end of Jan. the surface of the driveway is flaking up. There are at least 3 spots, a couple foot square that are doing this. We just came through a cold snap where the temp. fell into the single digits. The contractor said it was the cold temp. along with road salt that came from the vehicles sitting on the driveway. Is this possible or was it just bad concrete or poor workmanship? When they poured it they were gone by midday. Frames and all.

ToddS

02:56PM | 02/13/03
Member Since: 01/26/03
7 lifetime posts
It could be poor workmanship, the wrong concrete mix, or a chemical de-icer (road salts shouldn't do that much damage). If you didn't apply a de-icer, it shouldn't have done this.

If the concrete mix was not air-entrained, it would also behave this way. Air-entrainment is produced by a chemical additive that creates microscopic air bubbles in the concrete that will allow it to withstand the forces of freezing. If this is the case, continued low temperatures will probably produce more of the same.

Lastly, sometimes when a finisher is trying to place a hot load (concrete is too old) they have to work it too much to get it nicely finished. This overworking will drive the air-entrainment from the mix, and/or change the water/cement ratio significantly enough on the surface to cause this scaling.

The fix for this type of problem can sometimes be achieved with an overlay, or re-surfacing with polymer mixes such as Ardex CD or some MiraCoat products. This repair should be performed by the contractor at no cost to you (that's my opinion as a concrete contractor).

Regards,

Todd Schneider



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