What does depth of calcination analysis measure?

Depth of calcination analysis is a method used to assess the physical changes that occur in gypsum wallboard as a result of exposure to high heat during a fire. When gypsum wallboard is subjected to intense heat, it undergoes a process called calcination, where the water content within the material is driven off, leading to structural changes. This analysis measures how far the calcination has penetrated into the wallboard, which can provide valuable information regarding the intensity and duration of the heat exposure.

By examining the depth of calcination, investigators can better understand the conditions present during the fire, including the potential source and duration of the fire, and how effectively materials within the structure reacted to the heat. This information is crucial for determining the cause and origin of a fire, as well as for assessing the extent of damage and necessary repairs.

In contrast to the other options, depth of calcination analysis focuses specifically on the changes in materials, rather than the general overall damage, fire suppression effectiveness, or speed of fire spread, making it a precise tool for fire investigation.