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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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