1. Before the construction of refractory castables, the following inspections should be strictly carried out: (1) Check the appearance and cleanliness of the equipment to be poured; (2) Check the condition of construction machinery and tools, and spare parts such as vibrating tools must be intact; (3) Check the type, size, layout and welding quality of the anchors, and the metal anchors must be treated with expansion compensation; (4) Check the surrounding refractory brick lining and heat insulation layer to prevent water loss; (5) Check its packaging and delivery date, and conduct a pre-experiment to check whether it is invalid; (6) Check the construction water, use tap water. If the above items fail to pass the inspection, the construction shall be carried out only after being qualified. Materials that have expired may not be used. During the construction, it is necessary to ensure that there is no power failure or interruption of the construction. 2. The template for refractory castable construction can be made of steel plate or hard wood board. The template should have sufficient strength, good rigidity, no shape, no displacement, no slurry leakage. The steel template should be coated with release agent, and the wooden template should be painted with waterproof paint. Reused templates must be cleaned first, and then painted before use. 3. The amount of water added should be strictly controlled in accordance with the instructions for use, generally 7%-9% is better, and should not exceed the limit. Under the premise of ensuring construction performance, the amount of water added should be less than more. 4. The mixing time should be no less than 15 minutes. Use a compulsory mixer during operation. When stirring, it is advisable to dry mix in advance, then add 80% water and stir, and then add the remaining water slowly and continue stirring according to the degree of dryness and wetness until a suitable working consistency is obtained. Clean the mixer first when mixing different castables. 5. Must be used in whole buckets and bags. The stirred refractory castable is generally used up within 30 minutes. In a high-temperature and dry working environment, this time should be shortened appropriately. The castables that have been initially set or even agglomerated shall not be poured into the mold frame, nor shall they be mixed with water before being used. 6. After pouring into the mold frame, it should be stratified with vibrating rod immediately, the height of each layer should not be greater than 300mm, and the vibration spacing should be about 250mm. Try to avoid touching the anchors during vibrations, and avoid prolonged or heavy shocks in the same location. After seeing the surface reflow, the vibrating rod should be slowly withdrawn to avoid segregation and voids. After the pouring is completed, the pouring body can no longer be compressed and shaken before solidification. 7. When pouring a large area, the construction should be divided into blocks. The appropriate area of each pouring area is about 1.5m2. Expansion joints should be set according to the design and should not be omitted. Expansion joints should be left at the intervals between the anchors. 8. After the surface is dry, immediately cover the exposed part with plastic film or straw bag. After the initial setting arrives, it should be regularly sprinkled with water for maintenance to keep the surface moist. The curing time should be at least two days, and water should be frequently sprayed on the first day. After the final setting, the side form can be removed to continue sprinkling and maintenance, but the load-bearing formwork must not be removed until the strength reaches 70%. 9. After the template is removed, the pouring body should be inspected in time. Quality problems such as honeycomb, peeling and voids should be dealt with and repaired in time. When the problem is serious, the defective part should be chiseled out to expose the anchorage, and then filled with the same quality tamping material to continue the maintenance. It is forbidden to use cement mortar to flatten to cover up the problem.
