Ceramics-Silikáty

Ensuring the adequate workability of cementitious coatings presents significant challenges in increasingly complex service environments. This study systematically investigates the effects of the cement particle size, water reducers and silica fume content on the workability of cement-based coatings. The individual impacts of these factors on the rheological properties (apparent and plastic viscosity) and bleeding ratio were first analysed. Subsequently, orthogonal experiments were employed to identify the optimal formulation. The results indicate that: (1) finer cement particles increase the slurry stability, but also increase the viscosity (reducing flowability), (2) the water reducer addition enhances the flowability, but reduces the stability (3) and the silica fume incorporation decreases the flowability, but significantly improves the stability. Considering practical performance requirements, the optimal formulation comprises cement with particle size O1, a superplasticiser dosage of 0.6%, and a silica fume content of 10%. This research provides fundamental insights for optimising cementitious coating formulations and contributes to the development of high-performance construction materials.