Study on the Change in Microstructure of Fly Ash Concrete Depending on Ages and Degree of Hydration Using XRD and SEM

This research analyzes the microstructure of hardened blended cement pastes. Fly ash was used to replace Portland cement type I paste. Test results indicated that hardened blended cement paste were significantly affected by duration after mixing. The X-ray diffraction (XRD) and the scanning electron microscope (SEM) showed changes of microstructure by duration.