ASSESSMENT OF FIRE DAMAGED CONCRETE USING COLOUR IMAGE ANALYSIS

By N. R. Short, J. Purkiss, S. E. Guise. 2001

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COMPRESSIVE STRENGTH-COLOR CHANGE RELATION IN MORTARS AT HIGH TEMPERATURE (2004, background): “In experimental studies, it is observed that when concrete is exposed to high temperatures, some changes in color occur [12,13].”
Colour Change in Heated Concrete (2014, methodology): “The method used by Short [8] consisted in observing samples through a polarising microscope equipped with a colour analysis software package.”
Evaluation of pore structures and cracking in cement paste exposed to elevated temperatures by X-ray computed tomography (2013, background): “The significance of these features in assessments of heated concrete has led engineers to evaluate changes in themechanical properties [3–10], color [11–14], evolution of cracking [10,15–21], and spalling [10,22–29] of fire-damaged concrete in relation to various temperatures, and to develop methods”
Behaviour of cement concrete at high temperature (2013, methodology): “It is generally agreed [10, 11] that when heated to between 300C and 600C concrete containing siliceous aggregates will turn red; between 600C and 900C, whitish-grey; and between 900C and 1000C, a buff colour is present.”