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Old 07-13-2012, 04:55 PM   #16
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cracks in newly poured slab


The problem is with a slab and not a retaining wall.

Too much water in the mix (high slump ordered) or water added to make placement easier will reduce the concrete strength and make placement easier with the result of excess water on the surface and the lower concrete to settle and pull away from the bars and cause cracks, shrinkage and and lower durability. Big slabs have a problem of overcoming the labor and experience available, especially with higher air temperatures.

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Old 07-13-2012, 05:49 PM   #17
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cracks in newly poured slab


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did you use a mechanical vibrator on the retaining wall pour?
i used the vibrator in slab yes....those pics are of my ground floor slab...not retaining wall.
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Old 07-13-2012, 05:55 PM   #18
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cracks in newly poured slab


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No that's not what I thought it was,but those pics are pretty close up,any chance you can post pics so we can see the slab from a normal distance??
okay,its difficult but i will try.

but as you guys have got the idea now....other guy says its look like plastic shrinkage...and he has given the link for this...i saw the picture on that link and it was almost the same crack which i have developed in my slab....so i think its plastic shrinkage.

what you guys suggest?...continue my construction or should take care of these cracks if they are realy a problem?
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Old 07-18-2012, 04:10 PM   #19
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cracks in newly poured slab


tell me how long should i cure (with water) this slab?
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Old 07-18-2012, 05:03 PM   #20
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cracks in newly poured slab


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Originally Posted by charmer786@ View Post
i used the vibrator in slab yes....those pics are of my ground floor slab...not retaining wall.
No I was asking because you mentioned honeycomb in the retaining wall. It has been my experience that honeycomb is caused by air pockets/voids in the concrete.
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Old 07-18-2012, 06:13 PM   #21
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cracks in newly poured slab


NRMCA says they aren't a problem, and shouldn't impair the structure, so unless you hate the look, I'd leave them. Usually you wet cure for 7 days. But if this is plastic shrinkage, it sounds like we were right in that it was too hot and the placement took too long.

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