CIRIA Report 108, Concrete Pressure on Formwork (1985), provides a widely adopted methodology for calculating lateral pressure exerted by fresh concrete on vertical formwork. Utilizing a semi-empirical formula based on factors like pour rate and concrete density, the report helps determine maximum design pressure while accounting for modern cement types and admixtures. The guide serves as a key reference for temporary works, defining hydrostatic limits and pressure envelopes for concrete construction. For more details, visit CIRIA.
This article explores the origins, the core formula, and the lasting impact of this essential guide. We'll break down its science into plain English, exploring the key parameters that govern formwork design and showing why this report remains relevant in today's world of high-tech concrete. ciria report 108 concrete pressure on formwork
If your mix utilizes like self-compacting agents or retarders CIRIA Report 108, Concrete Pressure on Formwork (1985),
To understand the importance of Report 108, one must first understand the problem it solved. Before 1985, formwork designers often relied on simplistic assumptions. For more details, visit CIRIA
Lower temperatures delay setting (longer liquid phase), resulting in higher pressures.
$P_d = D \cdot \left[ C_1 \cdot \sqrtR + C_2 \cdot K \cdot \sqrt(H - C_1 \cdot \sqrtR) \right]$
When utilizing the principles of CIRIA Report 108, always verify the exact cement composition, pour temperature, and placement speed. For standard OPC mixes with traditional slump profiles, the historical CIRIA 108 curves offer excellent conceptual insights, but modern execution should leverage the updated Concrete Society CS030 guide to align with current Eurocodes and modern admixture behaviors.