The brand of cement: how to be good at them

In considering such concepts as the brand of cement, you need to focus on the official normative documents, among which we can mention ГОСТ30515-97, which divides all on special cements and construction. The cement mixture can have different bases (ferritic, aluminous or Portland cement clinker) and contain various mineral supplements.

Also worth noting is that different brands of cement have different levels of compressive strength, different speed curing (fast setting and normalerweise), different setting times - there is a mixture, which begins to harden in less than 45 minutes, and there is a slow binder. (over 2 hours).

Each brand of cement must comply with a number of indicators including: a particular material composition, the thickening time, compressive strength, the stressing, the density of the cement paste, line extension, maintenance of the required chemicals (chlorine ion, sulfur oxide, magnesium oxide), level of dehydration, heat dissipation and other characteristics.

Learn about the composition of the cement mixture is possible by its name. Detailed characteristics of the cement are given in the above-mentioned Visitor, as well as in ГОСТ10178-85. If the name starts on the PC – that this brand of cement based on Portland cement clinker, and if shpts – then we slag cement with high slag content weight (over 20%).

After the full or abbreviated names are numbers in the hundreds, which means the compressive strength. For Portland cement characteristic values 600, 550, 500, 400, Portland slag cement – the numbers from 500 to 300. Also it says in the title the maximum number of supplements from D0 (no additives) to D20 (additives – 20%). May contain an indication of the rapid solidification (B), the plasticization and surface treatment of the cement mixture (PL GF), manufacture of cement from clinker with a normalized composition (N) and reference to appropriate standards.

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For Example, a cement ПЦ550-D5-B-PL is a Portland cement with a compressive strength of 550, with 5% additives, bystrootverdevayuschey and plasticized.

During the construction of the building it is very important that the zero cycle works was carried out efficiently. Special attention should be given to the Foundation, often made of concrete. Concrete-a mixture of cement, sand and gravel. Brand of cement Foundation should have a sufficiently high compressive strength (400-500), and the higher the number, the smaller can be the number of other materials. For example, for cement grade 400 other materials taken in the ratio of 133, and to cement brand 500 - 144, respectively.

Cement is a material that absorbs water very well, which is undoubtedly reflected in his properties – it eventually loses the declared strength. Therefore, choosing the brand of cement for construction work, you need to look at the date of manufacture and terms of storage, since the cement grade 400 per month storage loses 10% strength, and in six months may lose 30% of this performance and become a cement 280. For such a cement will need more than supplements, however, there is no guarantee that the Foundation in this case to get the required strength.