Ciria Report 108 Concrete Pressure On Formwork

). The generalized approach involves determining a base pressure and applying correction factors based on the variables listed above.

CIRIA 108 is often considered more flexible for low- to moderate-rate pours, while EN 12812 is more prescriptive for safety-critical applications. Many formwork manufacturers now produce load tables that directly reference loading.

To help apply these concepts to your current project, could you share a few specifics? Please let me know the planned , the concrete temperature , or any admixtures you are using so we can explore how they impact your formwork pressure. Share public link

Slipforms have their own rules. CIRIA 108’s static formulas do not directly apply to continuously moving formwork (use CIRIA 59 or equivalent instead). ciria report 108 concrete pressure on formwork

): Factor in how the local ambient and mix temperatures will slow down or accelerate initial setting times.

CIRIA 108 provides formulas to determine the maximum pressure, which is usually the lesser of the hydrostatic pressure ( ) or a reduced pressure based on stiffening. 3.1. Maximum Pressure Calculation The maximum lateral pressure ( Pmaxcap P sub m a x end-sub

is the total height of the pour. This assumes the concrete acts as a perfect liquid for its entire depth. Many formwork manufacturers now produce load tables that

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The depth to which internal poker vibrators penetrate the concrete. Vibration temporarily destroys any internal aggregate friction, reverting the concrete back to a fully fluid state and maximizing lateral pressure within the zone of vibration. 3. The CIRIA 108 Mathematical Model

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. Share public link Slipforms have their own rules

Known for being quite precise, often used in European projects.

) based on concrete density, rate of rise, and temperature coefficients, distinguishing between wall and column applications. Detailed information on the 1985 report is available at CIRIA . Concrete Pressure Analysis per CIRIA 108 | PDF - Scribd