CIRIA Report 108 (1985) establishes the standard UK methodology for calculating lateral concrete pressure on vertical formwork, utilizing factors like placement rate, temperature, and mix composition to determine maximum pressure. Referenced in BS 5975:2019, the report addresses both hydrostatic and reduced pressure scenarios to optimize formwork design. Purchase the report at the CIRIA Official Bookshop . Concrete pressure on formwork - BS5975:2019 - Prontubeam
) on vertical formwork. Detailed information regarding the report can be found at Concrete pressure on formwork (R108) - CIRIA ciria report 108 concrete pressure on formwork
CIRIA 108 assumes internal vibration is stopped 1.5m below the current concrete level. If you over-vibrate (running the head too deep), you liquify the stiffened concrete, resetting the pressure to hydrostatic at that depth. CIRIA Report 108 (1985) establishes the standard UK
However, in practice, designers usually utilize the simplified charts derived from the report's regression analysis. The standard CIRIA equation is often presented as: Concrete pressure on formwork - BS5975:2019 - Prontubeam