I just started to demold a few of my smaller pieces and I noticed some white blotching on my tops. Doesn't seem to come off with water. What caused this and will it come out when I begin polishing? It's only where it had contact with the melamine and not on the back. I know I have some bug holes as well. Guess I could have spent some more time vibrating. I attached a picture to illustrate. Sorry for all the questions!

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Hence why you can start processing gfrc in 18 hours and start processing csacement@gmail.com in 10 minutes after pouring.

what is the mix you are using? Also are you using different types of sand in the piece?The concrete appears to me to be crazing.I am wondering if you are using sands with different moisture seeding rates which could be causing the concrete to fracture like this. I am talking about the table that is cracking all over. By the way nice table!

Jason Eller said:

Josh, can you be more specific regarding temperature? I had a bench that got up to 136 degrees, at which point I pulled the blanket off and misted it with water. I noticed small cracking, not sure if that was the cause.

If you have any knowledge of what is happening chemically at that temperature, please share.
Thank you.
This bench was made with Trinic's GFRC admixture and quikrete fine sand.

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