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Measuring the cahr rate of cross laminated timber in an intermediate-scale furnance

An important parameter in determining the fire performance of CLT is its charring rate. The aim of this research is to measure the charring rate of CLT by conducting a series of experiments in an intermediate-scale fire resistance furnace under ISO 834 conditions. The char rate was measured using implanted thermocouples to track the progression of the char layer through the sample, giving a char rate of 0.83 ± 0.20 mm/min. A second measure of the char rate was obtained by removing the char layer after the experiment and manually measuring the decrease in cross-sectional depth. This technique measured the char rate of CLT to be 0.83 ± 0.11 mm/min. Care should be taken in applying these results in a design context and it is recommended that full-scale furnace testing under standard fire conditions be undertaken to assess whether the char behaviour observed during this research is applicable to larger panels of CLT.

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