Home decoration can not be separated from cement, such as plastering, inlaying block-like decorative materials, patch plugging. Masonry projects require cement. If the cement is not properly selected or cement of unqualified quality is used, water leakage from kitchens and bathrooms will result; wall surfaces, ceilings will appear powdery, fall out or peel off, and the decorative materials of the inlay will loosen. In order to avoid these troubles caused by the factors of cement, we introduce some knowledge about how to choose and use cement in home decoration.
First, high-quality cement mainly has the following points:
l) Cement paper bags are well-packaged and fully labeled. The labels on the paper bags are: factory name, production license number, cement name, registered trademark, variety (including variety code), label, packaging year, month, date, and serial number. Different types of cement are marked with different colors. Portland cement and ordinary portland cement use red, slag cement uses green, and pozzolan cement and fly ash cement use black.
2) Using your fingers to pick up the cement powder, you feel a little fine, sand, and powder, indicating that the cement is fine.
3) The color is dark gray or dark green.
4) No damp caking phenomenon.
Second, inferior cement has the following main points:
1) The marking items on the cement packaging bag are incomplete (such as the factory name, production license number 2, cement name, registered trademark, variety, label, packaging year, month, date, and serial number, etc.) because the national standard specifies: Cement type, cement number, factory name, and factory number in the cement packaging mark are not all defective products.
2) Open inspection, with moisture and agglomeration.
3) Using your fingers to pick up the cement powder, you feel that there are more coarse sand powder and there are a lot of rough particles, indicating that the fineness of the cement is coarse and abnormal.
4) The cement strength of yellowing and whitening (yellow indicates that the clinker is raw and burned, and the amount of white slag is excessive) is relatively low. (3 3) It is important to look at the production date of cement when buying cement.
The cement also has a production date, and the cement performance beyond the valid period of 30 days has declined. After three months of storage, the strength of the cement decreased by 10% to 20%, decreased by 15% to 30% after six months, and decreased by 25% to 40% after one year. High-quality cement can be solidified in more than 6 hours. Cement that does not solidify for more than 12 hours is of poor quality. If the worker tells you that the tiles were still able to be replaced and replaced by the day before, then the quality of the cement must be very poor. Then after 2-3 months, some tiles may start to fall off and fall off!
Fourth, the old cement label is 425, the new label is 32.5, the performance is the same, if you buy cement number 425, then you have to pay attention to whether it is expired.
Fifth, the tiling is best to use cement instead of just glue. When the mortar is formulated in the project, the adhesive strength between the mortar and the base layer is required to be good. Therefore, the amount of cement should be more when preparing. In order to enhance the adhesive force, often incorporate 5%-10% of 107 glue or polyester acid vinyl emulsion in the mortar.
Sixth, when cement is used as a bonding material, the cement used shall be a qualified cement of 425# or more and it shall not expire. The sand used should be sieved medium and coarse sand. The mortar mix ratio is: cement:sand=1:2 (volume ratio).
Seven, floor tiles should use dry shop, wall tiles should be wet shop.
Eight, cement 50 kg per package, its amount is roughly: 15 square meters of a single room needs 5-6 bags; 24 square meters of a room with 8-9 bags; 32 square meters of two rooms with a hall 10-11 Package; 41-square-meter three-room one-room use 13-14 bags.
Ten, below zero cement construction, add antifreeze.
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