(1 = Wall, 2 = Column) , Concrete Structure Type Coefficient dependent on the size and shape of the formwork Cement type Coefficient dependent on the constituent materials of concrete
D = h = H = R = T = K =
25.00 3.30 3.30 3.00 32.00 0.56
kN/m³ m m m/hr ° C unitless
Weight Density of Concrete Vertical Pour height Vertical Form height The rate at which the concrete rises vertically up the form Concrete temperature at placing ( 36/T+16 )², Temperature Coefficient
2.0 CIRIA 108 ‐ Provisions ‐ When C1 R > H, the fluid pressure (Dh) should be taken as the design pressure. P1 = H =
1.73 m 3.30 m
Pd1 = Pd1 = Pd2 =
C1 R incorporates the effects of vibration and workablity Vertical Form height
Pressure is, D[C1√R+C2K√(H‐ (C1√R)]) 53.87 kN/m² 82.50 kN/m²
Calculated Pressure Dh, Pressure
CONCRETE PRESSURE DIAGRAM
‐ The Design Pressure is the smallest between the two calculated values.
3.5
Design Pressure = 53.86 kN/m² Hz =
2.15 m
0, 3.30
Height of Hydrostatic Zone
3
‐ ‐ ‐ ‐
‐
‐
‐
C1 C1
1.00 1.50
Concrete OPC, RHPC or SRPC without admixtures OPC, RHPC or SRPC without admixtures, except a retarder OPC, RHPC or SRPC with retarder LHPBFC, PBFC, PPFAC or blends containing less than 70% ggbfs or 40% pfa without admixtures LHPBFC, PBFC, PPFAC or blends containing less than 70% ggbfs or 40% pfa with any admixtures, except a retarder LHPBFC, PBFC, PPFAC or blends containing less than 70% ggbfs or 40% pfa with a retarder Blends containing more than 70% ggbfs or 40% pfa
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