The concrete itself is externally good in quality. But they cheated on the volume. (Ribbon foundation, concrete preparation, small-panel formwork). That is, the volume there should have been clear. According to the calculation, 28.5 cubes are needed, I ordered 29 with a margin, as a result, I ordered 3.5 cubes from above. Even if you imagine that the formwork was stretched out by a centimeter, there would be 1 cube on top, but not 3.5. As a result, concrete would also be delivered.