The standard dimensions of a slump cone used in a slump test for measuring fresh properties of concrete is _________.
1
bottom diameter - 10 cm, top diameter - 10 cm, height - 30 cm
2
bottom diameter - 20 cm, top diameter - 10 cm, height - 30 cm
3
bottom diameter - 20 cm, top diameter - 20 cm, height - 30 cm
4
bottom diameter - 10 cm, top diameter - 20 cm, height - 30 cm