7. what to do with the scraper sticky board?
General mortar, in order to enhance the adhesion with the wall, has a relatively high viscosity. This will make the later construction more difficult, the scraper rod is not smooth, and it is easy to stick to the board. At this time, the problem cannot be solved by increasing the amount of water to dilute the consistency, otherwise it will cause sagging and drooping.
The most effective way to solve the problem of scraper rod sticking is to add an appropriate amount of thixotropic lubricant. Thixotropic lubricants have the functions of lubrication, thixotropy, water retention and suspension. Workability and scratchability can be improved. Make the scraping rod smooth, not strenuous, and not stick to the board.
8. How to solve the problem of water resistance of gypsum mortar?
The high water absorption rate and low softening coefficient of gypsum are the main reasons for water resistance. Generally, the water absorption rate of gypsum in 72 hours is about 28%, and the softening coefficient is about 0.35.
In order to solve the problem of water resistance, an appropriate amount of water repellent and borax are generally added to the gypsum mortar. Hydrophobic agent and borax can release the free water of paste aggregates. Increase the solid density of gypsum, reduce the water absorption of gypsum, and increase the strength of gypsum after hardening.
The water absorption rate of gypsum can be reduced by about 8% through a reasonable proportioning scheme. The softening factor increased to 0.83. In addition, the kitchen and bathroom are plastered with gypsum mortar. when laying tiles. Laying tiles with tile glue. Joint with waterproof joint compound. Make sure that moisture cannot penetrate the gypsum mortar layer.
9. How to eliminate roughness and pores on the surface of the scraper?
After scraping with the H scraper, it is inevitable that roughness and pores will appear. At this time, it can be eliminated by scraping and finishing process. This process requires the use of an airfoil scraper.
Be careful when using wing scrapers
One is to scrape when the material is still soft enough. In this way, the scraped slurry can be used to fill and seal the rough places and small holes on the wall surface with the airfoil scraper.
The second is to always use a fixed side to scrape against the wall. Avoid new unevenness caused by roughness on the other side.
The third is to keep the wing scraper and the wall at an angle of about 75° for scraping. Only through this operation can small irregularities be detected and eliminated.
10. How thick is the machine-sprayed gypsum mortar?
The thickness of the plastering layer shall be specified by the architectural design. According to the “Code for Construction and Acceptance of Building Decoration Engineering”, the average total thickness of the plastering layer should be:
Ceiling – slats, hollow bricks, cast-in-place concrete 15mm; precast concrete 18mm; metal mesh 20mm.
Inner wall – common plastering 18mm; intermediate plastering 20mm; advanced plastering 25mm.
General machine sprayed gypsum mortar can be sprayed 8mm ~ 20mm. The average spray thickness is 10mm. PABC machine-sprayed gypsum mortar can spray 3mm to 35mm. The average spray thickness is 8mm.
Landcel is one of the largest cellulose ether manufacturers in China. The produced cellulose ethers are widely used in construction additives. Among them, there are additive products for gypsum mortar. Such as HPMC, RDP, etc. Increase the water retention and anti-sag properties of the mortar. Convenience and better construction. The quality is stable and reliable. Welcome to consult for free samples.
Several questions about machine-sprayed gypsum mortar
Several questions about machine-sprayed gypsum mortar (2)