Corundum wear-resistant plastic
Corundum wear-resistant plastic is a kind of gas-hardened amorphous refractory material made of high-quality refractory raw materials such as brown corundum and silicon carbide, combined with special binders and additives in strict proportions. It is widely used in high-shrinkage parts in thermal kilns, such as circulating fluidized bed boilers, various heating furnaces, and high-temperature dust kilns in cement building materials and other industries. The construction method of corundum wear-resistant plastic is different from other amorphous refractory materials. Compared with refractory castables, corundum wear-resistant plastic is easy to construct, does not require formwork, and does not require baking, which can greatly shorten the construction period.
The specific construction method is as follows:
PART 01 Preparation work before construction
1) Generally speaking, corundum wear-resistant plastic needs to be trapped before being transported to the construction site (some new plastic products in recent years can be exempted from trapping). It is strictly forbidden to stack in the open air during storage, and corundum plastic that is exposed to rain and moisture is strictly prohibited to use.
2) There are two construction methods for corundum wear-resistant plastic: ramming and coating. Compared with the same period last year, ramming is more commonly used.
3) Preparation of construction machinery: Mixing must be carried out using a forced mixer, and must be equipped with a tamping machine, a measuring bucket, a scale, a trimming knife, a wire brush, etc.
4) Construction bodies that require welding of nails, support of anchor bricks or welding of tortoise shell mesh should be carried out before construction.
PART 02 Material mixing and mixing
1) Mixing: Corundum wear-resistant plastic and binder and coagulant are packaged separately. The ratio design should be adjusted accordingly according to the changes in seasonal temperature. The temperature at the construction site is most suitable at 5~25℃. The mixing amount should be adjusted and determined according to the power of the mixer on site. A dedicated person is responsible for supervising the entire process of material ratio, measurement and mixing, and keeping records of each ratio.
2) Mixing: ① Before mixing, the inside of the mixer should be cleaned to prevent the phenomenon of hollow construction bodies caused by debris. ② First dry-mix the base material of the wear-resistant plastic for about 2 minutes, stir evenly, then slowly add the binder, stir for another 5 minutes, and then stir the accelerator for 1~2 minutes, then you can start construction. ③ The wear-resistant plastic after stirring must be used up within 40 minutes to prevent the plastic from condensing and affecting the construction quality.
PART 03 Technical requirements for construction
1) The parts that need to be constructed should be brushed with asphalt paint, and there should be no dirt, dust and other debris on the surface. Wait until the asphalt paint is completely dry before filling and tamping. The construction body after construction is strictly prohibited from seeing water.
2) It is required to be compacted and flat. If there are raised parts, use a trimming knife to flatten them and check the flatness with a ruler. If the construction thickness is not enough, one-third of the construction body must be shoveled off, and the filling and tamping must be carried out again to prevent the construction body from stratification.
3) Expansion joints, construction thickness, vent holes, surface treatment and other follow-up work must be left as required.
PART 04 Maintenance
The completed construction body should be naturally cured for 5-7 days in a dry environment, and the temperature is more suitable at 15~35℃. Avoid vibration of the construction body during the maintenance period.
PART 05 Crack treatment
If cracks appear in the construction body during the maintenance process, they should be treated if they are larger than 1mm; when the crack width is 1~3mm, the method of filling the crack can be adopted, that is, spraying glue to moisten and soften the crack, and tapping with a rubber hammer to close the crack; when the crack is larger than 3mm, the corundum wear-resistant plastic crack should be dug into a wedge-shaped mouth with a large inside and a small outside, spraying glue to moisten and soften, and carefully filling with corundum wear-resistant plastic.
Under the premise of ensuring the quality of materials, doing the above 5 construction steps well is the key to ensuring that the wear-resistant plastic lining can obtain the expected design service life or even extend the service life, and it must not be sloppy.
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