Shangcun video lectures cement yellow sand
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A: The basic concepts and uses of cement
When people walk around the market, they usually hear the 300th, 400th, and 500th cements. In fact, this is a reflection of the compressive strength of cement. After the 1980s, the test methods for the compressive strength of cement also took place. The change, now according to its compressive strength can generally be called 325,425,525 and so on.
No. 325 cement: It is also used more often. It is generally used when paving floor tiles and wall tiles.
No. 425 cement: No. 425 cement is generally more suitable for floors and so on.
II: Strength characteristics of cement
The greater the strength of the cement, the greater the shrinkage and the greater the pull on the tiles. Some netizens found that the tiles were cracked after being tiled in the house. In fact, it is not necessarily a problem with the quality of the tiles or the way in which they are laid. It is also possible that the quality of the selected cement is too good and the strength is too great to shrink. Too much force will also crack the tiles, so when buying cement, we must consult in detail, explain the purpose. It is recommended to use white cement when laying tiles.
Three: Cement specifications
Under normal circumstances, cement is not less than 49.5 kg per bag, which is 99 kg. When you buy, you can put the bag upright to see if the top is full or you have a balance to see if it is enough.
Four: Some Ways to Distinguish Low-grade Cement
1. Weight: The method of weighing the weight just mentioned may generally be insufficient for inferior cement.
2. Color: Authentic cement is generally slightly gray. Open the bag and look at it. A lot of poor quality cement is black.
3. Look at the packaging: The regular factory of cement, the packaging is very clean and well-proportioned, the edge is also relatively neat, and the poor quality of the packaging is very messy, the edge is not finalized.
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