Slip Form Calculator

Calculate slip form rate of rise, concrete volume per hour, and project duration.

Rate of rise (in/hr)

Slip form height (ft)

Wall thickness (in)

Structure perimeter (ft)

Total structure height (ft)

Concrete initial set (hrs)

Tab to move between fields

Form exposure time (hrs)

Set time adequate (1=yes)1

Max safe rate (in/hr)12

Volume per hour (cy)2.96

Total volume (cy)296.3

Total slip time (hrs)100

Total slip time (days)4.2

Estimated jack count23

Set Time Safety Ratio1%

How to Use This Calculator

Enter the Rate of Rise in inches/hour and Slip Form Height in feet for the assembly.
Enter Wall Thickness, Structure Perimeter, Total Structure Height, and Concrete Initial Set time.
Review Form Exposure Time and Max Safe Rate to confirm the rise rate allows proper concrete set.
Check Volume Per Hour and Total Volume in cubic yards to schedule batching plant production.
Use Total Slip Time in hours and days to plan crew rotation for continuous 24-hour operations.

How the result changes with Rate of rise (in/hr)

Rate of rise (in/hr): Vertical speed of the slip form. Typical range: 6-18 inches per hour.
Slip form height (ft): Height of the slip form assembly. Typically 4-5 feet.
Wall thickness (in): Thickness of the concrete wall being formed.
Structure perimeter (ft): Total perimeter of the structure (e.g., silo circumference).
Total structure height (ft): Total height of the structure to be slip-formed.
Concrete initial set (hrs): Time for concrete to reach initial set at the ambient temperature.

Form exposure time (hrs): Time concrete is inside the form before exiting the bottom.
Set time adequate (1=yes): 1 if concrete sets before leaving the form, 0 if rate is too fast.
Max safe rate (in/hr): Maximum rate of rise that still allows concrete to set inside the form.
Volume per hour (cy): Cubic yards of concrete placed per hour.
Total volume (cy): Total concrete volume for the entire structure.
Total slip time (hrs): Total duration of the continuous slip forming operation.
Total slip time (days): Total duration in days (continuous 24-hour operation).
Estimated jack count: Approximate number of hydraulic jacks needed (one per ~3.5 ft perimeter).

Identify Input Parameters
4 parameters
Rate of rise (in/hr) = 12, Slip form height (ft) = 4, Wall thickness (in) = 12, Structure perimeter (ft) = 80 = 6 input(s) provided
Calculate Form exposure time
Form exposure time = formHeight / rateOfRiseFtHr
4 = 4
Calculate Set time adequate
1 = 1
Calculate Max safe rate
Max safe rate = maxRateFtHr * 12
12 = 12