Take a look and see if the cement paper bag is in good condition and the logo is complete. The signs on the paper bag include: factory name, production license number, cement name, registered trademark, variety (including variety code), label, packaging year, month, day and number.

Twisted cement powder

The second twist, twisting cement powder with your fingers, feels a little fine, with sand and powder, indicating that the fineness of cement is normal.

Observe color

Third, look at the color, and observe whether the color is dark gray or dark green. If the color is yellow and white, the cement strength is relatively low (yellow means raw clinker burning, and white means high slag content).

Look at the date of production

Fourth, look at the time and the production date of cement. The performance of cement after 30 days of validity declines. The strength of cement stored for three months decreased 10%-20%, after six months decreased 15%-30%, and after one year decreased by 25%-40%.

Coagulation time detection

High-quality cement can set in more than 6 hours. /kloc-cement that cannot be solidified after 0/2 hours is of poor quality.