A look at the cement paper bag packaging is intact, the sign is complete. The signs 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.
In the second batch, the cement powder was rubbed with a finger and felt a little fine, sand, and powder, indicating that the cement fineness was normal.
Third, look at the color, observe whether the color is dark gray or dark green, the color yellow, white (yellow shows the raw material is clinker, white, indicating excessive slag content) cement strength is relatively low.
Four look at the time to see the production date of cement. Cement performance beyond the valid period of 30 days has declined. After three months of storage, the strength of cement is reduced by 10%-20%, decreased by 15%-30% after six months, and decreased by 25%-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.
Tips
It is advisable to add the words “must meet the national standards†on the purchase contract or invoice, and leave a sample in the construction. Once the project is completed, it is found that due to the quality problems of the Daxin board, the indoor environment may be polluted. The basis.
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Cement is one of the most important concealment projects in the decoration industry. Its advantages and disadvantages can be distinguished: First, the paper bags for cement should be well packaged and marked. The identification on the paper bag should include: factory name, production license number, cement name, registered trademark, variety (including product code), label, packaging year, month, date, and serial number. Second, buyers can use their fingers to pick up cement powder and feel a little fine, sand, and powder, indicating cement...
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