Home renovation can not be separated from cement. Only when we choose a good cement can we avoid many of our worries. How can we judge the quality of cement? When we buy cement, we should understand this issue. Here, Xiao Bian gave you talk about how to judge the quality of cement.
1 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 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 Use your fingers to pick up the cement powder and feel a little fine, sand, and powder, indicating that the cement is fine.
3 Observing the color is dark gray or dark green, the color of the yellow, white (yellow shows that the clinker is raw material, excessive white slag dosage) cement strength is relatively low.
4 There is no damp agglomerate phenomenon. Be sure to see the date of production of the cement. Cement also has a service life, and cement performance beyond the valid period of 30 days has declined. After three months of storage, the strength of 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.
How to judge the quality of cement, after we understand this problem, we must look at the choice of cement, so that we can choose a good cement.
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