Ciria Report 108 Concrete Pressure On Formwork Fixed Review

Establish the planned rate of pour (R) in m/h, concrete temperature, and density. Calculate Maximum Pressure ( Pmaxcap P sub m a x end-sub ): Use the formulas to find the maximum lateral pressure.

If you are currently designing temporary works, let me know if you would like to look at a specific using these formulas, explore how superplasticizers alter the C1cap C sub 1 factor, or compare this method to ACI 347 . Share public link

The pressure exerted by concrete on formwork is influenced by several factors, including: ciria report 108 concrete pressure on formwork

CIRIA Report 108 is a classic example of industry research that successfully transferred into daily practice. While it requires careful application when dealing with modern, highly fluid concrete mixes (like SCC), it remains the "go-to" document for standard concrete pours.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Establish the planned rate of pour (R) in

Usually assumed between 5°C and 20°C.

Structural collapse or bursting of the shutters due to underestimating the pressure. Share public link The pressure exerted by concrete

Applying CIRIA 108, they measured the setting time (E) of the site mix (a high-density concrete with PFA) at 3.5 hours and controlled the rate of rise (R) to 1.2 m/hour. The resulting P_max was just 120 kN/m².

While CIRIA Report 108 remains a highly respected and widely cited text, temporary works design has continued to evolve. In the UK and Europe, the principles of CIRIA 108 were largely integrated and updated into (Code of practice for temporary works procedures and the permissible stress design of falsework) and later revisions like CIRIA Report R108 equivalents found in modern safe-guides.

The report categorizes mixes based on aggregate type, cement type, and the use of retarders or plasticizers. Admixtures that delay setting times naturally extend the window of maximum pressure.

Materials like Fly Ash (PFA) and Ground Granulated Blast-furnace Slag (GGBS) slow down the early strength gain and hydration rate, leading to higher lateral pressures.