Application of X-CT Technology in the Microstructure Analysis of Cement-Based Materials

Abstract

Based on the small density changes of each phases, the defects and morphology of cement-based materials can be observed with the X-ray computed tomography (X-CT). The application of X-CT technology in the cement-based materials was reviewed in this paper. The microstructural changes during processes of carbonation, corrosion and steel corrosion were observed with X-CT equipment. It showed that the resolution of X-CT technology was limited and can up to 20um when the sample is small enough. The distribution of fibers, the pore structures and the cracks could be observed with 2D/3D images, and statistical information could also be calculated by the software. So the X-CT equipment played an important role in the strengthening and toughening mechanism analysis of fiber-reinforced concrete, porosity calculations and antifreeze analysis of general concrete and air-entrained concrete. The structural changes of concrete under the conditions of service, after carbonation, dissolution and steel corrosion could also be observed clearly.