Several points to be paid attention to during the construction of lightweight thermal insulation castables:

1. Formwork: The formwork for the construction of light-weight thermal insulation castables can be made of steel or hardwood (five-plywood). The formwork should have sufficient strength, good rigidity, no deformation, no displacement, no oar leakage, and the rigid formwork should be painted off. The wooden template should be coated with a waterproofing agent, and the reused template should be cleaned first, and then painted before it can be used. The inspection holes and cleaning holes should be made of plywood to make a regular tire mold. The metal ties for fixing the wooden formwork should be more than 4 per square meter, and the ties should be basically cold welded with anchors (that is, the ties of the template should be cold welded to the anchors).

 
2. Water-cement ratio: The amount of water added when stirring the lightweight thermal insulation castable should be strictly controlled according to the instructions, and must not exceed the limit. Under the premise of ensuring the construction performance, the amount of water added should be less than more.
 
3. Mixing: The mixing time of light-weight thermal insulation castables should be no less than 5 minutes (subject to the requirements of the manual), and a forced mixer should be used for operation. When stirring, it is advisable to dry mix and stir first, then add 80% of the amount of water to stir, and then, depending on the degree of dryness and wetness, slowly add the remaining water and continue stirring until it is suitable for the construction operation. Clean the mixer before mixing the lightweight thermal insulation castable.
 

lightweight thermal insulation castables usage

The binder, refractory powder and lightweight aggregate used for lightweight thermal insulation castables have different varieties and dosages, and their performance is also different; for castables mixed with water-reducing agents, water consumption is reduced and strength is increased, which is significant The addition of additives with a small bulk density can reduce the bulk density of the castable and increase its thermal insulation performance, but the strength will be doubled, and the more the amount, the more outstanding. Therefore, reasonable preparation and selection of lightweight heat-insulating castables should be made according to the use of thermal kilns and the use positions of castables to achieve the longevity and energy-saving goals of the kiln.