Ciria Report 108 Concrete Pressure On Formwork [patched] | RECOMMENDED |

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P_max = 11.4 + (720 * R) / (T + 18)

Formwork rigidity: Less rigid formwork can deform under pressure and attract greater loads; specify minimum stiffness or tie spacing to limit deflections and redistribution. ciria report 108 concrete pressure on formwork

4. Comparison with Other Standards

To appreciate Report 108's place in the industry, it helps to compare it with the American standard, ACI 347.

Outcome: The formwork supplier designed ties at 1.2 m horizontal × 1.5 m vertical spacing, versus 0.6 × 0.8 m for hydrostatic. Material savings: 60% less tie hardware, lighter walers, and faster assembly. The pour completed without any deflection or leakage. This project alone saved over £15,000 in formwork materials. You can use this as a LinkedIn article,

Critical Factors That Influence R and E

The magic of CIRIA 108 lies in accurately capturing Rate (R) and Setting Time (E). Misjudging these is the primary cause of formwork failure.

CIRIA Report 108 (1985) establishes a widely used semi-empirical method for determining maximum lateral concrete pressure on vertical formwork, focusing on factors like placement rate, temperature, and mix design. While it remains a foundational guide, limitations exist regarding high-performance concrete, pumping surge pressures, and modern self-compacting concrete (SCC), often requiring a full hydrostatic approach for the latter. For a detailed summary of the report, visit Studocu. Form pressure generated by fresh concrete Comparison with Other Standards To appreciate Report 108's

The key insight of CIRIA 108: Lateral pressure is a function of setting time and rate of pour, not just height.