Ciria Report 108 Concrete Pressure On Formwork Today
That’s where comes in. Despite being nearly 40 years old, it remains the gold standard guidance for calculating lateral pressure on vertical formwork in the UK and beyond.
Pmax=C1×R+C2×Kcap P sub m a x end-sub equals cap C sub 1 cross the square root of cap R end-root plus cap C sub 2 cross cap K (Where
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ACI uses distinct empirical formulas split explicitly between walls and columns. ACI relies heavily on chemistry factors ( CCcap C cap C ) and unit weight factors ( CWcap C cap W
CIRIA Report 108 (1985) is a seminal engineering document that provides empirical formulas to calculate lateral concrete pressure on formwork based on variables like placement rate, concrete temperature, and mix characteristics, including specialized calculations for both walls and columns. Although largely succeeded by modern standards like CIRIA Guide C725, its principles remain relevant for analyzing older structures, managing pour rates, and understanding the impact of concrete temperature and chemical admixtures on formwork design. Share public link That’s where comes in
The generalized CIRIA 108 equation for the maximum pressure blanketing the lower portion of the formwork is:
The absolute upper limit of concrete pressure is its hydrostatic envelope. This is calculated using the density of the concrete and the total height of the pour: This link or copies made by others cannot be deleted
$K = \left( \frac36T+16 \right)^2 = \left( \frac3632+16 \right)^2 = \left( \frac3648 \right)^2 = (0.75)^2 = 0.5625$
Structural collapse or bursting of the shutters due to underestimating the pressure.
Encourages the use of established models like DIN or CIRIA, adapting them for modern construction techniques.
), because SCC remains highly fluid for an extended duration. 5. Practical Design Tips for Site Engineers
