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Professional market selection materials
Cement and sand are the cornerstones of the renovation project. Their quality is directly related to whether the quality of the decoration can stand the test. Due to the fact that the current selection of accessories for decoration is very common, cement, sand and other accessories are provided by the home improvement company. Testing the quality of accessories is also an important part. In addition, self-purchasing of cement and sand may occur during construction. How to purchase such “substrates†is particularly important.
Although accessories such as cement and sand are common, not every building material market has sales. Before buying such accessories, it is necessary to consult the market first to find out if there is cement and sand to sell and to avoid returning.
At present, some small building materials market has gradually become a distribution center for cement, sand and other accessories, but the non-standard building materials market is prone to ambiguous quotes and short delivery. Therefore, the purchase of accessories is best to go to the professional brand building materials market.
Due to lack of professional knowledge, it is difficult to distinguish the authenticity of the accessories. Before the purchase, you can consult the industry experts for identification methods, such as the characteristics of ordinary portland cement, slag cement and fly ash cement that are commonly used in home improvement.
Seeing hand touch the cement
The commonly used cements are classified into five types: Portland cement, ordinary portland cement, slag cement, pozzolan cement, and fly ash cement. Ordinary Portland cement is commonly used in home decoration, and it is also called ordinary cement.
When purchasing cement, you should check whether the cement packaging is intact, and whether the factory name, production license number, cement name, registered trademark, variety (including product code), label, packaging year, month, and day are clearly marked.
Generally, regular cement has test reports. Consumers can ask the salesman to check the test report to judge the cement quality. The test report has concrete identification conclusions for various performance indicators such as cement strength.
Authentic cement will use packaging bags with internal moisture-resistant and non-breakable inner film, and poor quality cement tends to be rough and easily cause dampness of the agglomerate.
If there is a cement sample, you can use your finger to pick cement powder, if there is a feeling of a little fine, sand, powder, indicating that the cement fineness is normal. In addition, it is clear that the production date of cement is very critical, and the cement performance beyond the valid period of 30 days has declined.
Before the construction, the quality of the cement can also be checked through the solidification test: remove the appropriate amount of cement and stir it with water, and observe whether it is agglomerated after 6-12 hours. If it is still powdery, it means that the quality of the cement is poor or has gone bad.
In addition, if cement-bonded wall tiles are easily removed after a day or two, cement quality is also poor.
Easy way to pick sand
Cement needs to be blended with a certain amount of sand before it can be used as cement mortar. Therefore, the quality of sand is also very important. Sand can be divided into four types: fine sand, fine sand, medium sand and coarse sand.
In general, the thicker the sand is, the higher the strength of the cement mortar is. However, if the strength is too high, the quality of the project will be affected. Cracking will occur on the ground that is leveled with high-strength cement mortar. Sand is generally used for home improvement.
When purchasing sand, it is particularly necessary to guard against the use of fine sand as a substitute for sand and sea sand as a substitute for natural sand or river sand. Although the sea sand is clean, the salt content is high and the alkali is large, which will have a great impact on the quality of the project. Therefore, the use of sea sand in building decoration is strictly prohibited by the state. If you want to identify whether you bought sea sand, you can check whether there is a tiny sea creature shell in the sand.
As with the purchase of cement, if there is a sample of sand, you can use your hand to grab a handful of sand and tighten it tightly to make the sand into a ball. Then put the sand in your hand back into the bag and forcefully remove the remaining sand from your hands. If the sand still remains in the hand, the sand can be used. If the residue is soil, then the sand cannot be used. Sand with too high soil content will affect the cement's cohesiveness and weaken its hardness.
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