Ciria Report 108 Concrete Pressure On Formwork

CIRIA Report 108 (1985) is a seminal guide for calculating lateral concrete pressure on vertical and inclined formwork, utilizing a trapezoidal pressure distribution model. It provides empirical formulas incorporating factors like mix composition, placement rate, and temperature, acting as a, reference for modern construction and formwork design. Read the full report details at www.sciencedirect.com

Key Factors Affecting Pressure (According to CIRIA 108)

The report identifies several critical variables that influence lateral concrete pressure: ciria report 108 concrete pressure on formwork

Comparison with Other Codes (ACI 347, EN 12812)

To appreciate CIRIA Report 108, one must compare it to other major standards: CIRIA Report 108 (1985) is a seminal guide

1. Always perform a site-specific CIRIA calculation. Never rely on rule-of-thumb multipliers.
2. Measure concrete temperature at the point of placement. Use a digital thermometer.
3. Monitor actual placement rate. Use laser or ultrasonic sensors on the form face.
4. Apply a safety factor (typically 1.5 on calculated pressure) for formwork ties and panel bending.
5. Consider using adjustable-rate pumps to slow placement when temperature drops overnight.
6. For SCC (slump flow >650 mm), revert to 80% of hydrostatic as a conservative baseline.
7. Document your calculations – CIRIA 108 is accepted by most building inspectors and third-party reviewers.

Suggested Image for the Post: A graph showing "Lateral Pressure (kN/m²)" on the Y-axis vs "Height (m)" on the X-axis, with two lines: Always perform a site-specific CIRIA calculation

The report provides graphs and empirical relationships to determine this transition depth, typically 1–2 meters for ordinary concrete. Below the setting height, pressure is essentially constant.