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How I Failed my Concrete Countertop – Concretework on Handmade Channel

Watching many videos about concrete countertops makes me feel this is very easy and I had to give it a chance :)

Necessary rock studies of the gabbro and andesite basalt groups for the suitability as the raw material base for the production of continuous basalt fiber (CBF). A unique technique including laboratory melting and pilot-industrial melting at the high-tech equipment.

I did try to pour some smaller molds to find a better mix of cement and sand, and everything looked well until I did this big one.

Its size is about 220cm length 65cm width and 4cm height
Final weight is about 100kg (I did not weigh it but know how much sand/cement and water was spent)

So two weeks after concrete was poured and was looking completely dry – the countertop was removed from its mold. Surface was nice and smooth, clean edges, almost no air bubbles.

But when I started to polish it with diamond pads and applied some really soft pressure to the edge where was sink hole – it just cracked.

Both sides cracked …
That was a disaster…

Still don’t know what I did wrong… could be many reasons:
– bad concrete mix ?
– not enough reinforcement?
– too small height for its size and weight?
– should I wait longer for better drying ?

I should try it again later, some time later…

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Terms: build concrete countertop, cast in place, cement, concrete, concrete countertop form, concrete crack, concrete mix, countertop mold, countertops, diamond pads, DIY, epoxy basalt fiber, epoxy basalt fibre, fail, failed, granite countertop, handmade, how to concrete countertops, kitchen, kitchen cabinets, kitchen countertop, loft kitchen, mixing concrete, polish concrete, polishing concrete, pour concrete, pour in place, pouring concrete, quickrete mix, quikrete countertop mix, sand, sanding concrete, selfmade

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