· How Do I Mix Brick/Block Making Materials? Sieve out lumps, stones, twigs or foreign objects from the sand. Working with full wheelbarrows level to the top edges, lay the sand in a long, thin heap on a flat, clean, hard surface such as a metal sheet or a concrete slab. 3. Next add PPC SUREBUILD Cement 42,5 N with extra strength to the sand in the correct proportion (2 bags PPC .
Another sand block landed in that cube while the sand was entering it. A piston pushed a block into the cube the sand already partly occupied. (This is what happens in your towerofsand example.) In order to avoid breaking sand with piston mechanisms, don't push blocks into space sand is currently falling into.