3) Shrinkage cracks: As the concrete slab dries after placement, it shrinks. These cracks have little impact on durability. With the proper tools, you should be able to do the whole job in 4 to 6 hours. Crazing is a result of poor surface curing and only visible in hard troweled slabs. Although it seems like a big job, a 1 foot by 10 foot removal and repair is not as bad as it sounds. If you don't get a good solid patch, water could wick up through cracks or the hidden damage could compress or further separate in future shakes. The reason I would not recommend a quick fill fix is that there may be lots of other cracks below the surface. Wetting the existing concrete isn't a bad idea. Fill the entire void be sure to push the mix tightly against the existing concrete. Keep the mixture a bit to the stiff side, not too wet. You can use a ready mixed in a bag, just add water. Your knees and back will thank you for using a product that won’t require repeated repairs year after year. Once the edges are clean of dust and chips, carefully fill the open void with a mixture of concrete mix equivalent to a 5000 pound mix. Slab ® is an easy-to-apply water-based sealant that really stretches up to 300 of original crack size To create a permanent, weatherproof repair that stands the test of time. Slightly bevel the edges back from the surface to create an inverted "V", so it is slightly wider at the bottom than the top.
This can be done with a small hand held jackhammer. My first plan of attack would be to remove a rectangle of the damaged and weakened concrete apx one foot wide by the length of the crack, apx 10 feet. The cracks wander in a band about a foot wide with some parallel and joining cracks.
This is not going to be the answer you wanted to hear, but here goes.Īlthough I cannot see the cracks up close, it appears that the cracks were created by the floor flexing in a fairly straight line.
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