Refractory cement is a special type of cement with high temperature resistance and corrosion resistance. It is widely used in high temperature environments such as furnaces and chimneys. In order to ensure the best performance and service life of refractory cement, the correct use method is essential. The following is the correct use method of refractory cement for your reference.

1. Preparation
Material preparation

Choose the appropriate refractory cement according to the specific needs of the project (such as temperature resistance grade, compressive strength, etc.).
Prepare clean sand and water. The sand usually used should be refractory sand or high-quality medium sand.
Tool preparation

Mixing tools (such as electric mixers or manual mixers).
Measuring tools (such as measuring cups, scales, etc.) to ensure accurate material ratios.
Construction tools (such as spatulas, shovels, etc.).
2. Ratio
The ratio of refractory cement generally needs to follow the recommendations provided by the manufacturer. The usual ratio is:

The ratio of cement: sand is generally 1:3 or 1:4 (adjusted according to specific usage requirements).
The amount of water should be moderate. Too much will affect the strength, and too little will affect the workability.
3. Mixing
Dry material mixing
First, mix the refractory cement and sand in proportion to ensure uniformity.
Add water
Slowly add water while stirring continuously until the mixture reaches a uniform paste state, and there should be no dry powder particles.
Mixing time
Usually the mixing time is 3-5 minutes. Ensure that it can be used after mixing evenly.
4. Construction
Base treatment
Before construction, ensure that the base is clean and dry, without oil, dust and other substances that affect adhesion.
Application method
Use a spatula to evenly apply the refractory cement to the construction surface, the thickness is generally 2-5 cm, depending on the specific needs of the project.
Compacting
After the application is completed, use a tool to gently compact to ensure that the cement is fully combined with the base surface to avoid hollowing.
5. Maintenance
Wet maintenance
After the refractory cement is constructed, wet maintenance is required. Keep the surface moist, cover it with a wet cloth or spray water regularly, and continue to maintain for more than 7 days.
Temperature control
Avoid high temperature and strong wind during maintenance to prevent water from evaporating too quickly.
6. Precautions
Avoid pollution
During the construction process, avoid mixing refractory cement with other substances, such as oil, chemicals, etc., so as not to affect its performance.
Expiration date
Refractory cement should be used as soon as possible after opening. It is usually recommended to use it up within one to two months after opening to prevent loss of activity.
Safety protection
Wear protective gloves and masks during construction to avoid dust inhalation and skin contact.
7. Troubleshooting
Cracking problem
If cracking occurs, it may be due to excessive evaporation of water or improper maintenance. It should be remedied in time and kept moist.
Insufficient strength
Insufficient strength may be due to improper proportioning or uneven mixing. The material ratio and mixing time should be ensured.
8. Summary
The correct use of refractory cement involves multiple links, from preparation to construction and maintenance, all must be carried out in strict accordance with the operating specifications. Through reasonable proportioning, meticulous construction and sufficient maintenance, the performance of refractory cement can be effectively improved, its service life can be extended, and the safety and stability of the project can be ensured. In actual application, it is necessary to adjust the plan according to specific needs to ensure the quality of construction.