In situ 4D image analysis of crack width and strain changes in GFRP-reinforced concrete

Abstract This paper presents a pipeline for investigating crack development and strain changes in concrete beams that are reinforced with a glass fiber-reinforced polymer (GFRP) rebar using 4D image data. Concrete beam samples were loaded and imaged simultaneously using computed tomography at several load stages. The displacement fields were estimated from the resulting time series of images using the MorphFlow method. Individual cracks were segmented and analysed at selected stages of their for