Ciria Report 108 Concrete: Pressure On Formwork

Rearrange the formula: R_max = P_allowed / (1.2 × D × E) If your formwork is rated for 80 kN/m², you solve for R to determine the maximum trucks per hour.

ACI 347 uses empirical curves based on column size. CIRIA 108 is more scientific for walls and unusual geometries because it explicitly accounts for the concrete's hydration chemistry. For complex projects, many engineers run both and use the higher (safer) value. Special Cases: Self-Compacting Concrete (SCC) Standard CIRIA 108 was written before SCC became ubiquitous. SCC has much higher flowability and longer setting retention. Does CIRIA 108 still apply? ciria report 108 concrete pressure on formwork

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." Rearrange the formula: R_max = P_allowed / (1

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. For complex projects, many engineers run both and