1, gypsum self-leveling batch stability is poor (mobility is not up to standard, bleeding)
Interpretation: Different specific surface area of building gypsum has different impact on the application effect of water reducing agent. When the specific surface area is less than 8130cm2/g, the correlation between the adsorption capacity and dispersion of water reducing agent is more obvious. Due to the different fineness, the adsorption capacity of water reducer is more affected, and the water reduction rate is significantly different.
2, light plaster plaster smeared on the wall smell big
Interpretation: The odor of desulfurized gypsum treated with ammonia affects the delivery, which can be solved by adding a certain proportion of quick lime.
3, with desulfurized gypsum production surface coating plaster gypsum flower, and thin layer of local powder, thick layer of local color deep strength can be.
Interpretation: Heavy calcium powder is added in excess because of its inertia and color contrast factors
4, according to the following white cement 80, heavy calcium 900, BP24 2, U40,000 3.2 starch ether 0.5, bentonite 20 scrape to phosphite plaster plaster surface off the skin
Interpretation: Phosphogypsum shrinkage is very large, if you need to cover the construction should be in the initial setting period, overdue difficult to engage, putty is easy to pull down.
5, the air block base layer of heavy paint gypsum, a construction of 2-3cm, hanging net second construction of 2-3mm, surface depowder.
1) Thin layer construction must be less heavy calcium, 1t does not exceed 100kg, otherwise the surface strength is too low, the corresponding amount of cellulose requirements are more; 2) Ningxia natural gypsum mine due to less free water in the ore, insufficient water pressure, wash treatment before calcination, the free water of the powder mine at least 5% to calcination, Ningxia's natural crystal type is incomplete, resulting in cracking of the crystal surface. It is recommended to add some desulfurized gypsum.
6, gypsum can add rubber powder to improve the performance?
The film forming of rubber powder affects the evaporation of water, and its strength is greatly affected.
7, why gypsum is too fine, the specific surface area is too large, but the strength is reduced?
If the dissolution rate is slow or the amount of dissolution is too large, it will cause supersaturation to last for too long, generate too many crystal nuclei, and form fine crystals, which is bound to increase more crystallization stress, destroy the formed crystalline structure, and eventually reduce the strength.
8, the customer paint gypsum is not good construction "sticky", the strength can not meet the requirements.
Added calcium formate good construction, strength up.
9. Aging problem
Qualified aging is impossible in large-scale production, natural aging for at least half a month, more than 100 tons a day in the factory, increasing the inventory problem, at the same time, if the gypsum is underburned, the more the strength is worse.
10. For plaster plaster, small cracks appear after wind blowing
It is considered to be active cracking, gypsum instability, and this has been the case before, and calcium is not aggravated at the earliest. The active material needs to increase the calcium powder to reduce its activity, and the heavy calcium powder does not participate in the chemical reaction, and this cracking is chemical cracking. Wind crack, and the amount of retarder added is also related, adding more than half a day not to do.
Post time: Dec-13-2024