Ciria Report 108 Concrete Pressure On Formwork |link|

Despite being over 35 years old, CIRIA Report 108 remains the current UK guidance. Its continued relevance stems from:

Imagine designing the formwork for a wall as if the concrete were a heavy liquid—this is the hydrostatic approach. For a 3-meter-high wall, this would mean designing to withstand over 70 kN/m² of pressure at the base. For decades, up until the mid-20th century, these large and often overly conservative pressures were the standard used for formwork design.

Input the planned rate of rise and placing temperature to find the active structural coefficients. Compute Pmaxcap P sub m a x end-sub : Run the CIRIA 108 empirical formulas.

): The unit weight of the mix. Higher densities directly increase the gravitational push against the shutters. Formwork Dimensions (

For a typical wall pour: