How to distinguish the quality of cement from bad. How to confirm whether the quality of cement is good or not.

How to distinguish the quality of cement from bad

1. When identifying and purchasing cement from the cement packaging, be sure to carefully observe the outer packaging of the cement. Generally, the trademark will be clearly printed, the logo will be clear and the pattern will be complete. The surface of genuine products is smooth and flat, and the color is dark blue-gray, while the color of inferior products will be yellowish or white. 2. Identification from the cement gel. For cement produced by regular manufacturers, the surface of the cement gel is very even and has no color difference, so it can also be judged by this point.

3. Identification of cement color When purchasing cement, you should choose according to the area of use. If the temperature is high in the area, it will be high-quality cement. On the contrary, if the temperature is low, the color of the cement will be dull.

4. Another simple way to identify cement from the feel is to touch and twist the surface of the cement with your hands to feel whether it feels smooth. If it feels astringent, it is basically caused by the improper mixing of cement raw materials. If it feels grainy after hardening, there may be impurities inside the cement.

5. Listen to the merchant’s introduction. When we choose cement, we can first twist the cement with our hands to feel the fineness of the cement powder. If the quality is poor, the cement powder will be very rough.

6. When purchasing, we should pay attention to the shelf life. For cement that has exceeded the shelf life, we must contact the manufacturer in time for replacement or return.

7. To see the solidification effect, we pour out the cement and then put it into clean water to see if it can quickly settle and form blocks. If there is no stickiness after hardening, it means that it is a fake product. If the cement particles are relatively uniform and the color is yellow and white, it means that the strength of the cement is not high.

How to confirm whether cement quality is good or not

1. Check the quality of the cement carefully. If you purchase a large amount of cement, you can negotiate with the merchant for inspection. This is to carefully check whether there is moisture or agglomeration inside the cement. If there is any phenomenon, it is not recommended to buy it.

2. Look at the content on the packaging bag. If the identification items on the purchased cement packaging bag are incomplete, it is likely to be a low-quality product. Because the national standard stipulates that if the cement variety, label number, factory name and factory number in the cement packaging label are not fully qualified, it is considered a substandard product.

3. Use your fingers to feel the fineness of the cement. Consumers can use their fingers to twist the cement powder. If they feel that there are more coarse sand powder and many coarse and hard particles, it means that the fineness of the cement is coarse and abnormal. You should choose relatively fine cement. cement powder.

4. Check the production date of cement. The production date of cement is very important. The performance of cement that exceeds the validity period of 30 days will decline. The strength of cement decreases by 10%-20% after three months of storage, by 15%-30% after six months, and by 25%-40% after one year.

5. Look at the color of the cement. If you see that the color of the cement powder is yellow or white, it means that the strength of the cement is relatively low. Choose cement powder that is dark gray or dark green in color, the quality will be better.

The difference between good cement and poor cement

1. Look at the test report packaging. Generally, regular cement has a test report. Consumers can ask the salesperson for it and check the test report to judge the quality of the cement. The test report has specific identification conclusions on various performance indicators such as cement strength.

2. Check the solidification degree of the cement. Before construction, you can also check the quality of the cement through a solidification experiment: take out an appropriate amount of cement, add water, stir and let it solidify, and observe whether it agglomerates after 6-12 hours. If it is still powdery, it means the cement is of poor quality or has deteriorated and expired.

3. Adhesion If the wall tiles pasted with cement are easy to remove after a day or two, it also means that the cement quality is poor.