Cement allows for very solid works. There are different cements that are selected according to the type of work to be done.
The cements are made from a mixture of limestone (80%) and clay (20%), crushed and then heated to 1500° C, producing clinker which is then reduced to powder. A product is obtained which, when mixed with water, forms a plastic and unctuous paste.
As it dries, this paste traps moisture and solidifies with sand and aggregates.
There are different cements. The characteristics of each of them are indicated on the packaging in the form of a codification a bit complicated to understand... It should be noted that, for a large majority of masonry work, you will be led to use the "CEM" II - 32.5 R ", the most commonly used.
Codification of cements
Click below to read in greater detail the codification details of a cement package:
The different qualities of cement
|Class||Denomination||constituents||Use / Type of work|
|CPA-CEM I||Portland Cements||95% clinker|
+ 5% secondary constituents
|All work in reinforced or prestressed concrete, cast on site or prefabricated. They allow quick stripping and commissioning.|
|CPJ-CEM II||Portland Composite Cements||65% minimum of clinker||All concrete work (whether reinforced or not): standard works in elevation, paving, masonry (some prefabricated products), soil stabilization.|
|Blast furnace cements||5 to 64% clinker|
+ granulated blast furnace
|Underground work, deep foundations, large mass and in aggressive environments (injections, piles, gypseous ground), works for sewage or industrial, work with the sea or in very pure waters.|
|CPZ-CEM IV||Pozzolanic cement||45 to 89% clinker|
+ natural or calcinated pozzolana
|Same as CEM III|
|CLC-CEM V||Slag and ash cement||20 to 64% clinker|
+18 to 50% fly ash or slag
|Same as CEM III|
- Prompt Cement: quick setting cement (10 to 30 min), saving time and efficiency on the jobsite.
- White cement it can be easily tinted for the realization of polished concrete floors or masonry furniture.
- Dustless cement: cement without release of dust, limiting allergies and respiratory troubles.
Diluted cement or lime alone in water (without addition of sand) can only be used for very specific work and on small thicknesses.