1. Ordinary Portland cement, Portland cement, or special cement with a strength grade of no less than 32.5 MPa shall be used; expired cement or cement that has become damp and caked shall be strictly prohibited.
2. Medium sand should be used, with a mud content of no more than 1% and a sulfide and sulfate content of no more than 1%.
3. The water used for mixing cement mortar shall comply with the provisions of the Standard for Water for Mixing Concrete (JGJ63-89).
4. Polymer emulsion: The appearance shall be free of particles, foreign matter, and coagulum, and the solid content shall be greater than 35%. Specialized products should be selected.
5. The technical performance of admixtures shall comply with the quality requirements for first-grade products or above in national or industry product standards.