Fundamental Study on the Thermal Shrinkage Behavior of Hardened Cement Pastes Containing Fly Ash While Heating Up to 1200℃

Key Points

• To investigate the thermal shrinkage behavior of hardened cement pastes with and without fly ash as they are heated to 1200℃.
• Conducted experiments using ordinary Portland cement pastes and fly ash-substituted samples.
• Utilized X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis to assess material properties.
• Measured thermal expansion behavior through a dilatometer.
• Identified differences in thermal shrinkage behavior across three temperature ranges.
• Observed variations in thermal behavior attributed to differences in calcium silicate hydrate composition.
• Noted changes in phase transitions during calcination linked to the presence of fly ash.