Technical requirements for construction of refractory castable

Refractory castable, castable construction technical requirements

1. Clean water shall be used for mixing refractory castable.

2. The formwork for pouring should have sufficient stiffness and strength, and the dimension of supporting formwork should be accurate, and should prevent deformation in the construction process.Formwork joints should be tight, no leakage of pulp.Take anti - stick measures to the formwork.Surfaces of insulated masonry in contact with castable shall be waterproofed.

3. Castable material shall be stirred by forced mixer.Stirring time and amount of liquid added should follow the construction instructions.When changing the material brand, the mixer, hopper and weighing container should be rinsed.

4. The stirred refractory castable shall be finished within 30min or within the specified time according to the construction instructions.Castable material that has been initially set shall not be used.

5. The setting of expansion joint of overall refractory lining should be in accordance with the design regulations.If there is no provision, the following data can be used for the average value of each meter long expansion joint of lining: clay refractory castable is 4 ~ 6mm;The refractory castable of high alumina cement is 6 ~ 8mm;Phosphate refractory castable is 6 ~ 8mm;Sodium silicate refractory castable is 4 ~ 6mm silicate cement refractory castable is 5 ~ 8mm.

6. The casting of refractory castable shall be carried out continuously.Before the initial setting of the previous layer of pouring material, the second layer of pouring material should be finished pouring;If the interval exceeds the initial setting time, it shall be treated according to the requirements of construction joints.Construction joints should be left in the center line of the same row of anchor bricks.

7. The refractory castable shall be maintained in accordance with the design method after construction.No external force and vibration during curing.

8. Open mold.No load-bearing formwork, should be able to guarantee the strength of the pouring material on its surface and edges and corners not due to the damage or deformation of the folding mold, mold can be removed.The load-bearing formwork should not be removed until the designed strength of the castable reaches 70%.Hot hard castable should be baked to a specified temperature before folding the mold.

9. There should be no spalling, cracks, holes and other defects on the surface of pouring liner.Slight network cracks are allowed.

10. Precast parts of refractory castable should not be stacked in the open air.When stacking in the open air, measures against rain and moisture should be taken.