Ciria Report 108 Concrete Pressure On Formwork Jun 2026

Control R by limiting concrete delivery trucks or adjusting pump speed.

One of the most valuable sections explains the phenomenon of particle interference. As concrete stiffens, the aggregate particles begin to arch, transferring load to the sides of the formwork via friction, thereby reducing the pressure on the lower layers. R108 quantifies this reduction, leading to more economical formwork designs compared to assuming full liquid head. ciria report 108 concrete pressure on formwork

Purpose: Provide practical methods for estimating lateral hydrostatic-like pressure from fresh concrete, and for selecting/designing formwork and bracing to resist that pressure during placing and early setting. Control R by limiting concrete delivery trucks or

The report uses a simplified empirical equation to determine the maximum characteristic pressure ( cap P sub m a x end-sub the aggregate particles begin to arch

Where: