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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 :)

The main activity of Global Basalt Engineering LLC is creation of effective productions on release of continuous basalt fiber (СBF) with technologies of the last generation and composites on the basis of СBF (Basalt Fiber-Reinforced Polymer Composites as BFRP).

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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