Cracks in New Driveway

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Old 02-14-13, 09:32 AM
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Cracks in New Driveway

Hi, I have started to notice cracks in a driveway that is only around 6-8 months old. Surprisingly, the cracks are near the joint lines. A picture is below. Any thoughts on whether this is normal, and what the fix is? Should they be filled with sealant or should these parts of the driveway be redone? thanks
 
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Old 02-14-13, 10:13 AM
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Not sure what the fix is unless you can get the installer to replace the damaged sections. The tooled joints don't appear to be deep enough to keep the cracking localized to the joints. The joints are intended to be designed weak points so the inevitable cracking will be controled (hence the name control joint?). The joints should typically be about 1/4 the depth of the slab (IE; 4" thick slab = 1" deep joints).

It is also possible in a larger area that expansion joints would be required. Expansion joints are actual cold joints that are isolated from the adjacent areas with some type of premolded expansion material. At times in larger driveways there are no expansion joints installed and this could put more stress on the slab than is it designed to take. A concrete slab can shrink about 1/2" to 5/8" over 100'-0". I have seen 300 foot long drives with no expansion joints and they develop a great deal of cracking over time.
 
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Old 02-16-13, 09:48 PM
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Appears to be an amateur finishing job--as pointed out, the groover used was too shallow, and no one bothered to refloat the groover's edge marks, either. If you're lucky, you'll get the contractor to float some mortar paste into the cracks, and he'll call it fixed. If that's supposed to work (and not re-crack), you need to require that all of the existing grooved joints be saw-cut at least 1" deep.
 
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