👉Chemical component of Portland Cement :
🚧Tricalcium Silicate ( C3S )
⏺Percentage : 50% - 65%
🏷Role
C3S hydrates and hardens quickly and consequently influences concretes setting time and early age strength significantly.
More strength gained from C3S occurs at the first stage of hydration.
The early strength development of C3S is accompanied by generation of heat.
Accordingly, when control of heat of hydration is important, such as in type II cement, the amount of C3S will be reduced to the lowest possible.
🚧Dicalcium Silicate ( C2S )
⏺Percentage: 20% - 40%
🏷Role
It is the second most abundant compound in Portland cement, develops strength slower than C3S while it's strength contributes at later ages. It is also produces less heat upon hydration than C3S.
Accordingly higher percentages of C2S are important in cements used to produce concrete when early age
strength is not as important as controlling heat generation such as type II cement.
🚧Tricalcium Aluminate ( C3A)
⏺Percentage : typically the following:
OPC ( type I ) : 5% - 12%
SRC ( type V ) : 3% - 5%
Type II : max 8%
Type III : 10% - 15%
🏷Role
C3A plays a major role in characteristics of fresh concrete.
It is starts the hydration process quickly upon exposure to water and generates much heat during the first few days.
It is also contributes to the very early age strength of one to three days, however it may somewhat reduce the advanced age strength.
🚧Tetracalcium Aluminoferrite ( C4AF )
⏺Percentage :
Grey cement : 5% - 12%
White cement : 1% - 2%
🏷Role
Mainly responsible for greyish color of cement due to containing iron
@etconp
🚧Tricalcium Silicate ( C3S )
⏺Percentage : 50% - 65%
🏷Role
C3S hydrates and hardens quickly and consequently influences concretes setting time and early age strength significantly.
More strength gained from C3S occurs at the first stage of hydration.
The early strength development of C3S is accompanied by generation of heat.
Accordingly, when control of heat of hydration is important, such as in type II cement, the amount of C3S will be reduced to the lowest possible.
🚧Dicalcium Silicate ( C2S )
⏺Percentage: 20% - 40%
🏷Role
It is the second most abundant compound in Portland cement, develops strength slower than C3S while it's strength contributes at later ages. It is also produces less heat upon hydration than C3S.
Accordingly higher percentages of C2S are important in cements used to produce concrete when early age
strength is not as important as controlling heat generation such as type II cement.
🚧Tricalcium Aluminate ( C3A)
⏺Percentage : typically the following:
OPC ( type I ) : 5% - 12%
SRC ( type V ) : 3% - 5%
Type II : max 8%
Type III : 10% - 15%
🏷Role
C3A plays a major role in characteristics of fresh concrete.
It is starts the hydration process quickly upon exposure to water and generates much heat during the first few days.
It is also contributes to the very early age strength of one to three days, however it may somewhat reduce the advanced age strength.
🚧Tetracalcium Aluminoferrite ( C4AF )
⏺Percentage :
Grey cement : 5% - 12%
White cement : 1% - 2%
🏷Role
Mainly responsible for greyish color of cement due to containing iron
@etconp