New NDT techniques for the assessment of fire-damaged concrete structures

By Matteo Colombo, R. Felicetti. 2007

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The influence of thermal-stressing (up to 1000 °C) on the physical, mechanical, and chemical properties of siliceous-aggregate, high-strength concrete (2013, methodology): “Ultrasonic waves have long been used to monitor concrete structures [93,94].”
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.”