Formwork Load Calculator

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based on DIN 18218:2010-01

based on CIRIA Report 108:1985

based on ACI 347R-14

based on CSA S269.1-16

based on GB 50666-2011

Standard Selection

Standard

Imperial units

If the checkbox is checked, you use the inch-pound version.
If the checkbox isn't checked, you use the SI version.

SI units

If the checkbox is checked, you use the SI version.
If the checkbox isn't checked, you use the inch-pound version.

Boundary Conditions

Consistency class

F1	≤340mm	stiff
F2	≤410mm	plastic
F3	≤480mm	soft
F4	≤550mm	very soft
F5	≤620mm	flowable
F6	≤700mm	highly flowable
SCC	>700mm	self-compacting

End of setting t_E at T_C,Ref (h)

The end of setting t_E at T_C,Ref has to be a value between 5 hours and 20 hours.

For obtaining this value, please see Annex A DIN 18218:2010-01.

Reference temperature T_C,Ref ( °C)

The reference temperature T_C,Ref has to be a value between +5 °C and +30 °C.

The differential temperature ΔT between the reference temperature T_C,Ref and the placing temperature T_C,placing has to not be more than:
■ 10 °C (consistency classes F1-F4)
and
■ 5 °C (consistency classes F5, F6 and SCC).

Placing temperature T_C,placing ( °C)

The placing temperature T_C,placing has to be a value between +5 °C and +30 °C.

The differential temperature ΔT between the reference temperature T_C,Ref and the placing temperature T_C,placing has to not be more than:
■ 10 °C (consistency classes F1-F4)
and
■ 5 °C (consistency classes F5, F6 and SCC).

Lowest concrete temp. up to t_E ( °C)

The influence of the lowest concrete temperature up to t_E has to be considered if it goes below the placing temperature T_C,placing while the concrete sets.

The differential temperature ΔT between the reference temperature T_C,Ref and the lowest concrete temperature up to t_E has to be not more than:
■ 10 °C (consistency classes F1-F4)
and
■ 5 °C (consistency classes F5, F6 and SCC).

Pouring height H (m)

The pouring height H has to be a value between:
■ 1 m ≤ H ≤ 10 m (consistency classes F1-F4);
■ 1 m ≤ H ≤ 15 m (consistency classes F5, F6 and SCC).

Consider special conditions

Special conditions:
■ Concrete specific weight γ_C ≠ 25 kN/m³;
■ Use of low-heat cement (LH cement).

Wall / base

A wall / base is a section where either the width or breadth exceeds 2 m (C₁ = 1).

Column

A column is a section where both width and breadth are 2 m or less (C₁ = 1.5).

Concrete type

Concrete specific weight D (kN/m³)

The weight density of concrete D has to be a value between 18 kN/m³ and 32 kN/m³.

Placing temperature T (°C)

The placing temperature T has to be a value between +5 °C and +30 °C.

Vertical form height H (m)

The vertical form height H has to be a value between:
■ 2 m ≤ H ≤ 10 m (in case of walls / bases);
■ 2 m ≤ H ≤ 15 m (in case of columns).

Pouring height h (m)

The pouring height h has to be a value between:
■ 2 m ≤ h ≤ 10 m (in case of walls / bases);
■ 2 m ≤ h ≤ 15 m (in case of columns).

Wall / base

Walls and bases are defined as vertical elements with at least one plan dimension exceeding 6.5 ft.

Column

Columns are defined as vertical elements with no plan dimension exceeding 6.5 ft.

Wall / base

Walls and bases are defined as vertical elements with at least one plan dimension exceeding 2 m.

Column

Columns are defined as vertical elements with no plan dimension exceeding 2 m.

Concrete type

Concrete slump (in)

The concrete slump must be a value between 0.4 in and 9.0 in.

Unit weight of concrete w (lb/ft³)

The unit weight of concrete w must be a value between 100 lb/ft³ and 240 lb/ft³.

Placing temperature T (°F)

The temperature of concrete at time of placement T must be a value between 40 °F and 90 °F.

Height of concrete placement h (ft)

The height of concrete placement h must be a value between:
■ 4 ft ≤ h ≤ 35 ft (in case of walls / bases);
■ 4 ft ≤ h ≤ 50 ft (in case of columns).

Internal vibration depth ≤ 4 ft

Check if the internal vibration depth is less than or equal to 4 ft.

Concrete slump (mm)

The concrete slump must be a value between 10 mm in and 300 mm.

Concrete density ρ (kg/m³)

The concrete density ρ must be a value between 1500 kg/m³ and 3600 kg/m³.

Placing temperature T (°C)

The temperature of concrete at time of placement T must be a value between 5 °C and 30 °C.

Height of concrete placement h (m)

The height of concrete placement h must be a value between:
■ 1.2 m ≤ h ≤ 10 m (in case of walls / bases);
■ 1.2 m ≤ h ≤ 15 m (in case of columns).

Internal vibration depth ≤ 1.2 m

Check if the internal vibration depth is less than or equal to 1.2 m.

Cement type

Percentage of fly ash (%)

Percentage of slag (%)

Use of retarder

The use of a retarder increases the lateral pressure P on the formwork.
Not every cement type permits the use of retarder.

Concrete slump (in)

The concrete slump has to be a value between 0.4 in and 9 in.

Concrete density W (lb/ft³)

The concrete density W has to be a value between 100 lb/ft³ and 240 lb/ft³.

Concrete temperature T (°F)

The concrete temperature T has to be a value between 40 °F and 90 °F.

Height of concrete placement h (ft)

The height of concrete placement h has to be a value between 4 ft and 50 ft.

Depth of immersion of vibrator h_i (ft)

The depth of immersion of the vibrator h_i has to be a value greater than 1 ft and has to be less or equal than the pouring height h.

Concrete slump (mm)

The concrete slump has to be a value between 10 mm and 230 mm.

Concrete density W (kg/m³)

The concrete density W has to be a value between 1500 kg/m³ and 3600 kg/m³.

Concrete temperature T (°C)

The concrete temperature T has to be a value between 5 °C and 30 °C.

Height of concrete placement h (m)

The height of concrete placement h has to be a value between 1.2 m and 15 m.

Depth of immersion of vibrator h_i (m)

The depth of immersion of the vibrator h_i has to be a value greater than 0.3 m and has to be less or equal than the pouring height h.

Concrete slump (mm)

The concrete slump must be a value between 50 mm and 230 mm. The correction coefficient of concrete slump influence β is determined by this input:
■ β = 0.85, if 50 mm ≤ slump < 90 mm
■ β = 0.90, if 90 mm ≤ slump < 130 mm
■ β = 1.00, if 130 mm ≤ slump < 180 mm
■ β not relevant for calculation, if 180 mm ≤ slump

Correction coefficient of concrete
slump influence β

1.00

Density of concrete γ_c (kN/m³)

The density of concrete γ_c must be a value between 18 kN/m³ and 32 kN/m³.

Concrete temperature on placing
T (°C)

The placing temperature T must be a value between +5 °C and +30 °C.
The initial setting time of fresh concrete is calculated based on this input:
■ t₀ = 200 / (T + 15)

Initial setting time of fresh concrete
t₀ (h)

5.7

Vertical pouring height H (m)

The vertical pouring height H must be a value between 1 m and 15 m.

Construction Description

Show parameters

Input Values

Consider formwork

Max. fresh concrete pressure
σ_hk,max (kN/m²)

Max. fresh concrete pressure
P_max (kN/m²)

Max. lateral pressure C_CPmax (lb/ft²)

Max. lateral pressure C_CPmax (kPa)

Max. lateral pressure P_max (lb/ft²)

Max. lateral pressure P_max (kPa)

Max. fresh concrete pressure
F (kN/m²)

The maximum fresh concrete pressure σ_hk,max has to be a value between %01.1f kN/m² and 140.0 kN/m².

Max. rate of rise
ν (m/h)

Max. rate of rise R (m/h)

Max. rate of placement R (ft/h)

Max. rate of placement R (m/h)

Max. rate of placement R (ft/h)

Max. rate of placement R (m/h)

Max. rate of placement V (m/h)

The rate of rise ν has to be a value between:
■ %01.2f m/h ≤ ν ≤ 7 m/h (consistency classes F1-F4);
■ %01.2f m/h ≤ ν ≤ 25 m/h (consistency classes F5, F6 and SCC).

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