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How to distinguish the quality of cement

Optional accessories for professional market.

As the cornerstone of decoration engineering, the quality of cement and sand is directly related to whether the decoration quality can stand the test. At present, it is very common to choose cleaning accessories for decoration. Accessories such as cement and sand are provided by home improvement companies. It is also an important link to test the quality of accessories. In addition, in the construction, cement and sand will be purchased by themselves, so how to purchase such "base materials" is particularly important.

Although cement, sand and other auxiliary materials are common, they are not sold in every building materials market. Before buying such accessories, you should call the market to find out whether there are cement and sand for sale, so as not to return in vain.

At present, some small building materials markets have gradually become the distribution centers of cement, sand and other accessories, but the irregular building materials market is prone to opaque quotations and short delivery. Therefore, it is best to buy accessories in the professional brand building materials market. Due to the lack of professional knowledge, it is difficult to distinguish the authenticity of jewelry. Before buying, you can consult the industry for identification methods, such as what are the characteristics of ordinary portland cement, slag cement and fly ash cement commonly used in home improvement.

Look at cement with your hands

Commonly used cement is divided into five types: portland cement, ordinary portland cement, slag cement, pozzolanic cement and fly ash cement. Ordinary Portland cement, also known as ordinary cement, is generally used for home decoration.

When buying cement, check whether the cement packaging is intact, and whether the factory name, production license number, cement name, registered trademark, variety (including variety code), label, packaging year, month and day are clearly marked.

Generally, regular cement has test reports. Consumers can ask the salesman for it, check the test report and judge the quality of cement. The test report has specific appraisal conclusions on various performance indexes such as cement strength.

Genuine cement will use inner-coated packaging bags with good moisture-proof performance and not easy to be damaged, while inferior cement often has rough packaging, which is easy to cause cement caking and moisture.

If there is a cement sample, you can twist the cement powder with your fingers. If there is a little feeling of fineness, sand and powder, it means that the fineness of cement is normal. In addition, it is very important to specify the production date of cement, and the performance of cement beyond 30 days of validity has declined. Before construction, you can also check the quality of cement through solidification experiment: take out a proper amount of cement, add water, stir and solidify, and observe whether it is caked after 6- 12 hours. If it is still powdery, it means that the cement is of poor quality or has deteriorated and expired.

In addition, if the wall tiles pasted with cement are easy to take down after a day or two, it also shows that the quality of cement is poor.