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For coating construction, there are five basic characteristics of qualified grass roots. To undertake the project should first check the situation of the grass-roots level, for those who do not have the value of treatment of the grass-roots (after processing still can not meet the basic requirements) should require Party A or other engineering personnel to take remedial measures.
(five requirements of qualified grass-roots)
-qualified grass-roots - flat
grass-roots uneven will affect the decorative effect of paint
China'
. The poor leveling of the grass also increases the amount of work and material consumption of dressing. The inspection of flatness has 4 items: surface flat, yin and yang angle vertical, facade vertical and yin and yang angle square.
the relevant parameters of
s leveling degree detection
qualified grass-roots - solid
1, grass-roots strength and the type of grass-roots and its own quality.
2, usually concrete, metal base strength is the highest, mortar strength is the middle, gypsum board strength is the lowest.
3, the grass-roots strength is too low will affect the adhesion of the coating.
4, usually with a blade to measure strength, with an empty drum hammer to measure the drum and other ways to check.
Mortar, concrete and plaster mortar grass wall prone to empty drums, the treatment method is to knock off the wall at the empty drum, pay attention to knock to a firm place, and then with the wall with the same material and matching material repair, and in accordance with the requirements of the new wall, maintenance after coating.
empty drum treatment
qualified grass- drying
mortar, concrete and other grass-roots construction, the internal moisture gradually dried. Drying time is directly related to the thickness, ventilation, ambient temperature and humidity of the grass. Suitable for the construction of water-based coatings, the water content should be less than 10%, solvent-based coatings, the water content of the grass should be less than 8%. Usually for cement mortar base, after the construction needs to maintain a period of time, in the case of good ventilation, cement-based materials maintenance cycle is generally 28 days, summer temperature high air circulation good 14 days can be, water content can meet the requirements. In places with low temperature, high humidity and poor ventilation, the drying time should be extended accordingly.
substrate moisture content detection
qualified grass-neutral
mortar, lime in concrete, cement has a strong alkaline, mainly because it contains a large amount of calcium hydroxide. Grassroots alkaline over-assembly affects the bonding of coatings, but also causes coating color change, layering and other quality accidents. Usually, with the evaporation of raw water, soluble alkaline calcium hydroxide is brought to the surface, and gradually react with carbon dioxide in the air to produce neutral calcium carbonate, so that mortar, concrete tend to neutralize. Therefore, after the grass-roots drying, alkaline should be reduced to meet the requirements of coating construction.
base base alkaline testing
qualified base - clean
clean grass surface is conducive to coating bonding. The pulp, dust, oil, mold, rust and so on on the grass surface should be removed and treated.