Surface condition

c

μ

Remarks

Very smooth

0.25

0.5

a surface cast against steel, plastic or specially prepared wooden moulds

Smooth

0.35

0.6

a free surface left without further treatment after vibration

Rough

0.45

0.7

a surface with at least 3 mm roughness at about 40 mm spacing, achieved by raking, exposing of aggregate

Indented

0.50

0.9

a surface with indentations complying with Figure 2