Hi All,
I am in Tucson, AZ and have a 2 year old home. I have noticed that a rather large crack has developed in my driveway control joint (link to pic below). It runs the full length of the control joint, and is roughly .375” wide. I have compared it to the neighbors driveway, and while they also exhibit cracks, they are tiny in comparison Mine seem to be all the way through the concrete… I realize that concrete cracks no matter what, but is this not "normal", or do I need to do anything about it (fill it)?

Picture: http://i232.photobucket.com/albums/ee189/bugman74/CIMG3451.jpg

Thanks,

Thaty is a significant crack due to uneven settling. If it were in the first few months I'd try to get the concrete installer to redo the job but two years is too far out for that argument. Yes fill it, either with cioncrete crack filler in a caulking tube or a rubberized gray caulk Amazon.com: 6 each: Ace Pourable Driveway Crack Filler (6435-9-34AC): Home Improvement (http://www.amazon.com/gp/product/B000N33D62)

It appears the concrete was poured with a wet mix. That led to increased shrinking and the crack in the control joint. I recommend you take a hammer and chisel to take off the irregular edges. Then get some pitch as is used on hot tar roofs, pour it and fill the crack. This will stop water infiltration and allow expansion under the hot summer sun. It is an almost permanent repair.

It appears the concrete was poured with a wet mix. That led to increased shrinking and the crack in the control joint. I recommend you take a hammer and chisel to take off the irregular edges. Then get some pitch as is used on hot tar roofs, pour it and fill the crack. This will stop water infiltration and allow expansion under the hot summer sun. It is an almost permanent repair.

I disagree with the wet mix accusation. However, that doesn't help you. You definitely need to fill that crater to keep out water and weeds. The pitch idea may work. I have never heard of it used on concrete. I would have recommended installing backer rod and a good caulking like they use on highways.