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CEE Materials

Stages of Portland Cement

TermDefinition
I (Normal) ---> II (Moderate) C3S ↓ C2S ↑ C3A ↓ C4AF ↑
II (Moderate) ---> III (Early Strength) C3S ↑ C2S ↓ C3A ↑ C4AF ↓
III (Early Strength) ---> IV (Low Heat) C3S ↓ C2S ↑ C3A ↓ C4AF ↑
IV (Low Heat) ---> V (Sulfate Resisting) C3S ↑ C2S ↓ C3A ↓ C4AF ↓
C3S is used for early strength development, rapid hydration, significant heat during hydration
C2S is used for slow hydration, long term strength and durability
C3A is used for flash setting, heat evolution reducing it increases sulfate resistance
C4AF is used for reducing clinker temperature, reducing/freeing calcium hydroxide, cement coloring little to no contribution to strength
Gypsum is used for Slowing down the C3A phase, preventing flash setting/hardening
Created by: Phillies55
 

 



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