Only by understanding cement can one understand concrete!
In addition, it also contains a small amount of free calcium oxide (f-CaO), periclase (crystalline magnesium oxide), alkali containing minerals and glass bodies.
The definition of cement refers to a hydraulic cementitious material that is finely ground (in powder form) and, after adding an appropriate amount of water, becomes a plastic slurry.
According to its purpose and performance, it can be divided into general cement, specialized cement, and characteristic cement.
General cement, such as Portland cement, ordinary Portland cement, slag Portland cement, pozzolanic Portland cement, fly ash Portland cement, etc; Specialized cement such as oil well cement, masonry cement, etc; Characteristic cement such as rapid hardening Portland cement, low heat slag Portland cement, expansive sulfur aluminate, etc.
It can harden in both air and water, and can firmly bond materials such as sand and stone together.
Classification of cement: There are many types of cement.
Chemical composition, characteristics and functions of cement components Raw meal with appropriate composition of clinker is burned to partial melting, and the product with calcium silicate as the main component is obtained (1) clinker composition Oxide composition CaO, SiO2, Al2O3, Fe2O3~95% MgO, SO3, TiO2, P2O5, K2O and Na2O~5% main oxide content fluctuation range: CaO62~67%; SiO220~24%； Al2O34~7%； Fe2O32.5~6.0%。 After high-temperature calcination, two or more oxides react to form various mineral aggregates with fine crystals (30-60%) μ m）。 Four main minerals: tricalcium silicate 3CaO · SiO2, which can be abbreviated as C3S; Dicalcium silicate 2CaO · SiO2, which can be abbreviated as C2S; Tricalcium aluminate 3CaO · Al2O3, which can be abbreviated as C3A; As a representative formula, the iron phase solid solution 4CaO · Al2O3 · Fe2O3 can be abbreviated as C4AF.
Bogue method for calculating mineral composition: C3S=4.07C-7.60S-6.72A-1.43F-2.86SO3; C2S=8.60S+5.07A+1.07F+2.15SO3-3.07C=2.87S-0.754C3S； C3A=2.65A-1.69F； C4AF=3.04F； CaSO4=1.70SO3, where C – CaO; S——SiO2； A——Al2O3； F – Fe2O3 percentage content
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It is commonly referred to as cement.
At present, there are over 100 types of cement.