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Research on Alkali-Activated, Spinelized Kaolin Cementitious Composite Materials
Yuyang Feng1,2, Chenyi Gao1,2, Feng Yuan1,2
1Research Center of Ancient Ceramic, Jingdezhen Ceramic University, Jingdezhen 333001, China.
Materials (Basel, Switzerland)
|September 13, 2025
Summary
This study developed advanced alkali-activated cementitious composites from kaolin for ceramic restoration. Optimal formulations exhibit superior flexural and bonding strength, with specific curing conditions crucial for performance.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Ceramic Engineering
Background:
- Traditional ceramic restoration materials often face limitations in bonding strength and durability.
- Alkali-activated materials offer a promising alternative due to their tunable properties and environmental benefits.
Purpose of the Study:
- To investigate the effects of curing temperature and time on the properties of alkali-activated cementitious composites made from high-whiteness kaolin.
- To determine optimal processing parameters for enhanced material performance, particularly for ceramic restoration applications.
Main Methods:
- Preparation of alkali-activated composites using kaolin, sodium water glass, and NaOH.
- Characterization using Field Emission Scanning Electron Microscopy (FE-SEM), X-ray Diffraction (XRD), thermal analysis (DSC-TG), and mechanical testing (flexural strength, bonding strength).
- Evaluation of whiteness, light transmittance, shrinkage, and hydrolysis resistance.
Main Results:
- Optimal parameters identified: kaolin calcined at 1100 °C, activator modulus 1.25, calcined kaolin-to-activator ratio 1:1, and 2.5% deionized water.
- Optimal sample achieved 23.81 MPa flexural strength and significantly enhanced bonding strength to porcelain.
- Curing temperature critically influences polymerization; below 100 °C it slows, above 100 °C it accelerates, with optimal curing time not exceeding 10 hours.
Conclusions:
- Alkali-activated kaolin-based composites demonstrate potential as effective ceramic restoration materials.
- The formation of cage-like, zeolite-like structures is closely linked to the observed material properties.
- Optimized curing conditions are essential for maximizing the mechanical performance and bonding capabilities of these composites.
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