In situ dynamic XCT imaging of the microstructure evolution of cement mortar in accelerated carbonation reaction

摘要

The microstructure evolution of cement mortar in accelerated carbonation reaction was investigated by in situ dynamic X-ray computed tomography (XCT) at different accelerated carbonation ages: 0 day, 3 days, 7 days, 14 days and 28 days. Three-dimensional and two-dimensional carbonation front progress images and grey values distribution were determined using XCT VG Studio MAX 2·1 software. The carbonation degrees of different time were measured by the volume fraction of uncarbonated and carbonated parts. In addition, the porosity and pore volume distribution of macro-pore were measured at different carbonation ages.