I absolutely loathe fiber in concrete. In my experience it does nothing beneficial that sealed control joints don't do better. Unless you like hairy concrete in which case fiber will help you on that.

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Posted by urinetrouble

Member since Oct 2007

20509 posts

Posted on 6/4/14 at 9:25 am to soccerfüt

quote:
All concrete does not crack. Prevention of cracks is more a function of appropriate sub-grade prep, appropriate panel geometry and dimensions, correct concrete strength and adequate concrete depth than reinforcement. In a home driveway with appropriate sub-grade and panel depth and geometry, a driveway could need no primary or secondary reinforcement and never crack (with appropriate drainage and under normal residential traffic).

Just no.

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Posted by soccerfüt

Location: A Series of Tubes

Member since May 2013

65787 posts

Posted on 6/4/14 at 9:40 pm to BottomlandBrew

quote:
I'd like to see a large slab poured with proper subgrade prep and no cracks. In my experience, concrete always cracks. I've never had a project where a slab didn't crack. The point is to control where it cracks, hence the name control joints.

If someone says "I've never had a project where a slab didn't crack." they either haven't had many projects or aren't very good at identifying possible sources of concrete failures, isolating them and preventing cracks.

You are confusing cracks with control joints. A crack is where concrete relieves some unplanned stress by failing. A "control joint" is a purposeful joint, not a crack. Douh! Allowing concrete to fail in a certain vertical plane is the result of proper planning and execution.

Drying shrinkage cracks (which are not ever full depth) and crazing (also only on the surface of concrete) are different types of cracks; preventing them is different. They are a bit more execusible but still somewhat avoidable. Go in a well-done Sam's Club or Home Depot and play "find the crack" in the floor. You won't. All concrete does not crack.

All concrete cracks*, that's like saying all steel rusts. If one asks too much of either material and does not take proper measures to prevent the issue, it will respond by failing. Anyone who says this* is misinformed and shows their ignorance about the material and physics.

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