Abstract
Industrial X-ray computed tomography has been applied to make time-resolved measurement of the initiation and growth of cracks within concrete specimens in order to characterize damage associated with delayed ettringite formation (DEF)[l]. Laboratory specimens of concrete were cast with variations in one of two possible variables of interest: potassium level or type of fine aggregate. The specimens were stored in water for times of up to one year, during which they were periodically removed from the bath to be measured for expansion and also scanned by X-ray tomography. The X-ray computed tomography system consists of dualfocus 420-kV continuous x-ray sources and a digital detector. The detector consists of 512-channel linear array CdW04 detector elements. The nominal spatial resolution of the image is 0.250 mm
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