Concrete to Soil / Rock |
0.30 |
Concrete to Steel |
0.45 |
Steel to Steel |
0.30 |
Steel to
Teflon Plate |
0.10 |
Brick
Masonry on moist clay |
0.33 |
Brick
Masonry on dry clay |
0.50 |
Brick
Masonry on sand |
0.40 |
Brick
Masonry on gravel |
0.60 |
Brick
Masonry to Brick |
0.70 |
Brick
Masonry on rock |
0.75 |
Granite
on Granite |
0.60 |
Limestone
on Limestone |
0.75 |
Cement
Blocks on Cement Blocks |
0.65 |
Cement
concrete on dry clay |
0.40 |
Cement
concrete on wet clay |
0.20 |
Cement
concrete on wet sand |
0.40 |
Cement
concrete on dry sand |
0.50
- 0.60 |
Cement
concrete on dry gravel |
0.50
- 0.60 |
Cement
concrete on dry rock |
0.60
- 0.70 |
Cement
concrete on wet rock |
0.50 |
Brick
on Brick |
0.65 |
Wood
on Wood |
0.48 |
Note:
Friction is more on dry surfaces of the same material compared to
wet surface. |