behaviour does not vary so much when the heating rate is low, changing the steel thickness does not tend to have as much effect as changing the coating thickness. The exception is when the steel section factor is very low (case D, section factor = 50 m-1). Comparison of thermal conductivity temperature relationships for different steel Figure 26 – section factors, minimum steel temperature case (intumescent coating thickness: 2 mm) Figure 27 Comparison of thermal conductivity temperature relationships for different steel – section factors, intermediate steel temperature case (intumescent coating thickness: 1.2 mm) Figure 28 Comparison of thermal conductivity temperature relationships for different steel – section factors, maximum steel temperature case (intumescent coating thickness: 0.4 mm) Figure 29 Comparison of the steel temperatures calculated using extracted thermal conductivity under ISO fire and Equation (9) and the steel temperatures using multi-layer for maximum steel temperature case (A04-B04-C04FAST) Figure 30 Comparison of the steel temperatures calculated using the extracted thermal conductivity under ISO fire and Equation (9) and the steel temperatures using multi-layer for minimum steel temperature case (A20-B20-C20-D20SLOW) Figure 31 Temperature distributions throughout the coating thickness for an average coating temperature of 500ºC (A12-B12-C12-D12ISO) Conclusions and further investigations This paper has presented a detailed assessment of intumescent coating behaviour (expansion
behaviour does not vary so much when the heating rate is low, changing the steel thickness does not tend to have as much effect as changing the coating thickness. The exception is when the steel section factor is very low (case D, section factor = 50 m-1). Figure 26 Comparison of thermal conductivity – temperature relationships for different steel section factors, minimum steel temperature case (intumescent coating thickness: 2 mm) Figure 27 Comparison of thermal conductivity – temperature relationships for different steel section factors, intermediate steel temperature case (intumescent coating thickness: 1.2 mm) Figure 28 Comparison of thermal conductivity – temperature relationships for different steel section factors, maximum steel temperature case (intumescent coating thickness: 0.4 mm) Figure 29 Comparison of the steel temperatures calculated using extracted thermal conductivity under ISO fire and Equation (9) and the steel temperatures using multi-layer for maximum steel temperature case (A04-B04-C04FAST) Figure 30 Comparison of the steel temperatures calculated using the extracted thermal conductivity under ISO fire and Equation (9) and the steel temperatures using multi-layer for minimum steel temperature case (A20-B20-C20-D20SLOW) Figure 31 Temperature distributions throughout the coating thickness for an average coating temperature of 500ºC (A12-B12-C12-D12ISO) Conclusions and further investigations This paper has presented a detailed assessment of intumescent coating behaviour (expansion