Ciria Report 108 Concrete Pressure On Formwork -

Research (including later CIRIA updates) shows that for SCC, the coefficient (1.2) is insufficient. SCC can maintain fluid-like behavior for longer, leading to near-hydrostatic pressures.

The report revolutionized formwork design, allowing for lighter, faster, and more economical systems—without sacrificing safety. To understand CIRIA 108, you must abandon the "liquid assumption." ciria report 108 concrete pressure on formwork

Lateral pressure is a function of setting time and rate of pour , not just height. Research (including later CIRIA updates) shows that for

This article breaks down every aspect of CIRIA 108, explaining how to apply its formulas, why it outperforms older standards like ACI 347, and how to prevent formwork failure on your next pour. Before CIRIA 108, engineers primarily relied on hydraulic pressure formulas, assuming that fresh concrete behaved like a liquid (Pressure = Density x Depth). While this approach (often called the "hydrostatic" model) is safe, it is wildly uneconomical. It assumes that until concrete hardens, every inch of height exerts full fluid pressure. To understand CIRIA 108, you must abandon the