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Ciria Report 108 Concrete Pressure On Formwork (2025)

Use a simple plumb line mark on the formwork with a time log. Or use modern IoT sensors that trigger alarms if the pour rate exceeds your R_max.

Studies indicate that for certain low-friction formwork, the CIRIA arching criterion (which assumes pressure stops increasing after a certain point) might be less conservative than ACI recommendations. ciria report 108 concrete pressure on formwork

Temperature dictates the hydration rate of cement. Higher temperatures accelerate the setting process, allowing the concrete to gain internal shear strength faster and reducing the duration of maximum pressure. Conversely, cold weather prolongs the liquid state, leading to higher lateral forces. Characteristics of the Mix Use a simple plumb line mark on the formwork with a time log

| Feature | CIRIA 108 (UK/Global) | ACI 347 (US) | | :--- | :--- | :--- | | | Setting time (E) and Rate (R) | Column size and pour rate | | Pressure Equation | P = 1.2 x D x R x E | P = D x (C1√R + C2) | | Minimum Value | 25 kN/m² | 30 kPa (624 psf) | | Best For | Walls, deep sections, controlled rates | Columns, moderate pours | Temperature dictates the hydration rate of cement

The methodology relies on empirical formulas developed from extensive field testing. Rather than treating concrete strictly as a fluid, CIRIA 108 calculates a maximum design pressure ( Pmaxcap P sub m a x end-sub ) based on the interaction of the variables listed above. Step 1: Determine the Pure Hydrostatic Pressure

Where is the concrete temperature at the time of placing (measured in degrees Celsius).

As cement hydrates, the concrete loses workability and begins to stiffen. This chemical transformation matrix limits how much hydrostatic pressure can build up over time. Temperature of the Mix