Ciria Report 108 Concrete Pressure On Formwork Jun 2026

| Method | Formula | Result (kN/m²) | Tie spacing @ 300kN capacity | Cost implication | | :--- | :--- | :--- | :--- | :--- | | | 23.5 x H | 70.5 kN/m² | Ties @ 0.9m x 0.9m | High (more ties, larger walers) | | CIRIA 108 | 11.4 + (785x3)/(15+17.8) | 11.4 + 71.7 = 83.1 kN/m² | Ties @ 0.85m x 0.85m | Wait—this is HIGHER? |

CIRIA Report 108, "Concrete Pressure on Formwork," is a foundational 1985 industry standard providing a two-part calculation model for predicting maximum lateral concrete pressure on vertical formwork, incorporating factors for placement rate and temperature. It serves as a, vital reference for structural engineers, specifically addressing varying pressures for walls and columns based on material and environmental conditions. For more details, visit CIRIA . Concrete Pressure Analysis per CIRIA 108 | PDF - Scribd ciria report 108 concrete pressure on formwork

Enter , a document that revolutionized how the industry predicts lateral pressure. Published by the Construction Industry Research and Information Association (CIRIA), this 1985 benchmark remains the most cited practical guide for formwork pressure calculation worldwide. | Method | Formula | Result (kN/m²) |

The breakthrough? They proved that —and that stiffening starts far earlier than previously thought, even at high slump. Their final equation (the “CIRIA method”) linked pressure directly to pour rate and temperature, not just slump. For more details, visit CIRIA

When concrete is placed:

. It determines pressure as a combination of hydrostatic and maximum pressure, accounting for modern admixtures, though it is not designed for self-compacting concrete منتدى المهندس . For more information, visit AI responses may include mistakes. Learn more Concrete pressure on formwork (R108) - CIRIA

Formwork is a temporary structure used to support and shape concrete until it sets and gains sufficient strength to stand on its own. The pressure exerted by concrete on formwork is a complex phenomenon, influenced by various factors, including the type of concrete, the rate of placement, and the geometry of the formwork. If not properly accounted for, concrete pressure can lead to formwork failure, resulting in accidents, delays, and increased costs.