Avoiding Ideas and Misunderstandings
There are two kinds of cement, special cement and common cement. The former has high index and high strength. It is suitable for plugging and construction of piers and other special projects. The latter can be divided into Portland cement, ordinary portland cement, according to different composition. There are five kinds of slag cement, pozzolan cement and fly ash cement. In the home improvement process, ordinary Portland cement is generally used, and the industry is also called ordinary cement.
According to different strengths, ordinary cement is divided into multiple numbers. Generally, the higher the number, the higher the strength. However, the higher the number does not mean that the better, different projects apply different grade (strength) of cement. For example, if you use an excessively high number of cement when laying tiles, it may cause emptying or even cracking of the tiles. In general, home interior decoration works are usually applied to cements numbered 32.5.
Cement can only be used after blending a certain amount of sand and turning it into cement mortar. Some owners think that
The more sand that is put, the worse the performance of cement mortar is, and it is not. According to Longfa Decoration Engineering Manager Jinfu Quan, according to the different construction projects, the proportion of cement mortar is also different. For example, the proportion of cement mortar used for laying wall tiles is 1:1, and the proportion of commonly used mixing for ground leveling is 1: 2 or 1:2.5 cement mortar.
In addition, some consumers often use expired cement to save money. Experts suggest that it is better not to do so.
According to reports, the shelf life of cement is usually 3 months. After 3 months, although cement can still be used, its strength will be greatly reduced.
Four strokes to identify cement
Experts suggest that consumers should start with the appearance, information, reports, and feel when buying cement.
Appearance refers to looking at the appearance of cement and its packaging quality. High-quality cement should be gray-white, and generally use moisture-resistant and non-breakable internal film-packed bags. Inferior cement tends to have rough packaging, which may cause moisture to agglomerate, and the color of the cement may be too dark or change to indicate excessive amounts of other impurities.
Information refers to the various signs and information on the cement packaging. Cement produced by regular manufacturers should be marked with registered trademarks, origin, production license number, implementation standards, packaging date, bag net weight, factory number, cement varieties, etc., with clear writing and complete content; inferior cement is often deliberately omitted some content, The information on the packaging is also often blurred. If consumers do not trust the cement they have purchased, they can dial the manufacturer's phone provided on the package and ask the manufacturer to help identify it.
The report refers to the manufacturer's test report. Consumers can ask the salesman directly and use the inspection report to judge the quality of the cement. In general, the test report will give the identification results of various performance indicators such as cement strength.
In addition to the above method, consumers can also check the quality of cement through their feel. High-quality cement particles are delicate; poor-quality products are rough in hand, and have low strength and poor viscosity when used.
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