Under the condition of good ventilation, the curing cycle of cement-based materials is generally 28 days.
Generally, with the volatilization of base water and the soluble alkali calcium hydroxide being brought to the surface, it gradually reacts with carbon dioxide in the air to produce neutral calcium carbonate, making mortar and concrete tend to be neutral.
3.
Before undertaking the project, first check the condition of the base course, For those who have no value to deal with (the basic requirements are still not met after treatment) Party A or other engineering personnel shall be required to take remedial measures.
The base course with poor flatness also increases the workload and material consumption of trimming.
The moisture content of the base material is qualified.
The flatness is the same Pass the flatness test of relevant parameters – firm base course 1.
The strength of base course is related to the type and quality of base course.
In places with low temperature, high humidity and poor ventilation, the drying time shall be extended accordingly.
For coating construction, a qualified base course has five basic characteristics.
Generally, the strength of concrete and metal base is the highest, the strength of mortar is in the middle, and the strength of gypsum board is the lowest.
The treatment method is to knock off the hollowing wall, pay attention to knock it to a firm place, and then repair it with materials of the same material and proportion as the wall, and paint it after maintenance according to the requirements of the new wall.
Therefore, after the base course is dried, the alkalinity will be reduced accordingly, which can meet the requirements of coating construction.
It is usually checked by measuring the strength with a blade and measuring the empty drum with an empty drum hammer.
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4.
The uneven base course will affect the decoration effect of the coating.
Empty drum treatment of qualified base course – after the construction of dry mortar, concrete and other base courses, the internal moisture will gradually dry.
There are four items for flatness inspection: surface flatness, vertical internal and external corners, vertical facade and square internal and external corners.
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Base material alkaline test qualified base course – the clean base course surface is conducive to the bonding of the coating.
The drying time is directly related to the thickness of the base, ventilation, ambient temperature and humidity, etc.
Excessive alkalinity of the base course will affect the bonding of the coating, and also cause quality accidents such as coating discoloration and peeling.
Generally speaking, the cement mortar base course needs to be cured for a period of time after construction.
Qualified base course – leveling.
The laitance, dust, oil stain, mildew and rust on the surface of the base course shall be removed and treated.
In summer, the temperature is high and the air circulation is good for 14 days, and the moisture content can meet the requirements.
The walls of mortar, concrete and gypsum mortar base are prone to hollowing.
The moisture content of base course suitable for water-based coating construction shall be less than 10%; For solvent based coating, the moisture content of base course shall be less than 8%.
Low base strength will affect the adhesion of the coating.
The base layer – neutral mortar, lime and cement in concrete have strong alkalinity, mainly because it contains a large amount of calcium hydroxide.
