How to choose a cement “
Cement is the main connecting material in the field of construction. To date, there are a lot of different brands of cement. If you yourself are trying to build something, you need to understand this case so as not to do portals. Cements are divided into such species: Portland cement, acid -pushed, clay -earth, berassed and much more.
In most cases, during construction you will face Portland -cement. Portland cement is divided into several categories: fast -hardening, hydrophobic, plasticized, sulfate -resistant. There are also several elections of the color of this cement. It is mainly white and black, but you can order any other, to your taste.
It must be remembered that concrete stones that are made of cement are very strongly corroded (destroyed). Corrosion is divided into two types – it is leaching and saline. In the first case of water, corrosion can be prevented if you add a little SA to the water (it). If leaching occurs for a long time – the stone will be destroyed, and no chemistry will stop this process anymore. In the second case, corrosion interaction of SA and air, as well as various alkaline salts,. The result of interaction is also destroyed.
Depending on the hardness of concrete, it is divided into stamps from M-200 and to M-600. Exist above, but it is a rarity. The M-600 brand has strength, almost twice as much as concrete from M-300. Quick-adopting Portland cements are available from two brands: M-400, M-500. The solution from this cement differs from others only in that in the early days it gains a very greater strength, which remains in the future. Cement may lose its qualities if there is a penetration of moisture and air. Portland cement plasticized has three brands, namely M-300, M-400, M-500. Such cements in their composition have surface-active additives. There are a huge amount of additives, and thanks to them the plasticity of concrete solutions increases significantly. Due to this, the time on the intake of the solution decreases. In addition, the frost resistance of concrete increases and its strength.
Portland cement hydrophobic is divided into brands M-300, M-400. Surface and active additives are practically not added to this cement. Thanks to this, cement can be stored for a very long time. Such cements are not collected in lumps, which means they do not lose their active properties.
Sulfato-resistant Portland cements are produced by M-300 and M-400. This cement is very well opposed to all corrosion, and especially sulfur. Ideal for summer cottages or cottages.
Color Portland cements are produced in M-400, M-500 brands. This type of solution is designed for all finishing work.
Slag-Portland cements are produced in brands M-300 and M-400. This solution in its composition has about 80% of domain slag. This concrete is very waterproof and anti -corrosion. The downside is that cement tolerates frosts very poorly. This type of concrete is not suitable for the northern areas, where very severe frosts.
For ordinary construction, it will be the best version of cement M-200. This cement is 20-25% of Portland cement. All the rest of the additives (active and inert).
A couple of tips, if you buy cement for the first time, and do not completely know what and what:
If you buy cement in the store, the manufacturing and marking date must be on the bags;
Do not forget that the cement stored in craftmeshki very quickly loses its strength, namely 5% for each month of storage. If we are talking about hydrophobic cement – here the percentage is two times lower;
Be sure to check for lumpiness. Fresh cement lumps does not have. Take it in a fist and squeeze it. If the cement begins to fall out, it means that it is fresh and you can buy it. If he remains in Zhmen, turn around and leave.
