COMMUNITY FORUM

dbsthompson

06:28AM | 07/05/99
Bvmisc
I would like to know a good source for instructions on replacing two 10' x 20' driveway sections. Specifically, expansion joints, section size (four 5' x 10'), pulling, and finishing.

Wick

06:54AM | 07/05/99
Try checking out the following website, http://www.quikrete.com/diycenter/pcenter.htm.

jorgeb

05:06PM | 07/06/99
Expansion joint should be placed any place the new concrete touched the old sections or any other rigid surface such as garage door frost walls, house foundation, etc. Sections should be no greater than 5X5. The entire are should be reinforced with wire mesh. If you ar eparking only cars than a 6x6/10x10 mesh is fine. However if you are parking trucks than use a road mat which would be 6x6/6x6. In both instances the first number is the size of the square opening and the second two is the guage of the wire. The road mat is best used in sheets. Call a concrete truck to deliver the concrete ready mixed. For two areas 10x20 at 4" thick you would need 5.5 cu yds at 6" you would need 8 c yds. These number include .5 c yds waste factor. Pour the concrete at a slump no greater than 5". The driver will know what it means. Spread the concrete with a rake, then screed it with a 12' 2x4 to acheive the plane you want. Use the wood form or existing concrete to sevre as a rail to ride the screed board. Buy or rent a bull float with adequate extension handles to cover all areas easily. Once the surface water has disipated pass the bull float once more to achieve smoothness. Use an egde tool to edge the pads and a groover to make the small squares. Keep the concrete damp with misting water from a hose for at least 7 days to prevent the concrete from drying out too quickly and cracking. Also, if you live in cold climates, consider doweling bars into the existing concrete as well as across any expansion joint in the new concrete (wrap one bar end with building paper to allow it to move in the concrete with expansion and contraction)
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