Finding fractures in slabs

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stefan Cave Dweller Member since January 2005 Posts: 14,113	Finding fractures in slabs May 16, 2021 17:50:55 GMT -5 Pat, opalpyrexia, and 1 more like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by stefan on May 16, 2021 17:50:55 GMT -5 Awesome tip! I wet the slabs with water and watch for bubbles!
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Finding fractures in slabs May 16, 2021 20:32:21 GMT -5 via mobile

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Post by Peruano on May 16, 2021 20:32:21 GMT -5

Even with water, capillary action will cause the fracture to remain wet as the rest of the surface dries
Another good clue comes from feeling the surface with a finger nail. At times only the finger nail can catch on the fracture. Tom

Tom
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standles spending too much on rocks Well all I got was a rock ... Cool! Member since February 2021 Posts: 325	Finding fractures in slabs May 16, 2021 22:41:35 GMT -5 via Tapatalk stephan likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by standles on May 16, 2021 22:41:35 GMT -5 I just drop the slab from 1 foot onto hard surface. If it cracks better i found it before starting to cab

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Finding fractures in slabs May 17, 2021 20:17:11 GMT -5 standles likes this

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Post by jasoninsd on May 17, 2021 20:17:11 GMT -5

@jadedvision - great topic for a thread!

I have a tendency to do the "concrete drop" method. However, I have started taking notice of the capillary action as mentioned by Peruano since I use a water cooling saw.

You mentioned the drop method can result in breakage along lines which normally would hold together. I noticed that the other day when I was dropping some material which fractured in what I believe was areas that would have held together when cabbing them...

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SirRoxalot freely admits to licking rocks Member since October 2003 Posts: 790	Finding fractures in slabs May 20, 2021 15:00:39 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by SirRoxalot on May 20, 2021 15:00:39 GMT -5 Wet the slab, and watch it dry. Fractures are pretty obvious. Carbide-tipped brick nippers take it apart with ease, or mark the cracks with a black marker if it’s valuable enough that you want to saw it.

stephan
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Finding fractures in slabs May 24, 2021 23:12:12 GMT -5 standles likes this

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Post by stephan on May 24, 2021 23:12:12 GMT -5

May 16, 2021 22:41:35 GMT -5 standles said:

I just drop the slab from 1 foot onto hard surface. If it cracks better i found it before starting to cab

I drop from about 3 feet, but not onto straight concrete, but carpeted (unpadded) concrete or linoleum.

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Finding fractures in slabs May 24, 2021 23:14:18 GMT -5 hummingbirdstones, jasoninsd, and 2 more like this

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Post by stephan on May 24, 2021 23:14:18 GMT -5

May 17, 2021 20:17:11 GMT -5 jasoninsd said:

Sometimes it will break along lines that may hold, but might undercut late in the process (think MHPJ).

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