Procedure for using the ASTM E1155 Standard of Concrete Floor Flatness Testing
Concrete Floor Flatness Testing Procedure for ASTM D1155
Different locations on the floor surface are marked with straight lines. Every 300 mm along each line, point elevations are measured. An approximation to the surface profile along each measurement line is synthesized based on the elevation differences between all adjacent reading points, and its consistency with visual observation is evaluated.
All elevation differences between points separated 3 m are calculated based on the arithmetic differences between all adjacent 300-mm elevation differences. Statistical analyses of these calculated profile values are used to estimate each test section’s FL Levelness and FF Flatness. To arrive at composite F-Numbers for each test surface, the F-Numbers for each test section are combined.
What is Floor Flatness Testing?
Floor Flatness is measured by tracking the difference in elevation between two points 1 foot apart and comparing them with every other 1-foot elevation change across a measured distance or “run.” Floor Levelness on the other hand compares the change in elevation over a distance of 10 feet, by determining the net change in elevation over 10 data points within the run.
How are FF and FL numbers calculated?
To calculate FL, add the absolute value of the z mean to three times the standard deviation, then invert the number. Flatness numbers are on a scale of 10 to 150, and most slabs fall in the range of 15 to 100. The minimum FL and FF values needed will depend on the building type.
How is Floor Flatness Measured?
FF—This number is used to indicate the flatness of a random-traffic floor. FF is measured as the curvature of the floor over a 2-foot interval. Take a grid of 2-foot intervals over the entire floor and put the values through an equation and you get the FF value as an indication of the waviness of the floor.
Chat with Us