CEMENT extenders Flashcards
(4 cards)
1
Q
Fly Ash
A
Fresh: ↑ Workability, ↓ early strength.
Hardened: ↑ Long-term strength, ↓ permeability (Durability).
2
Q
Ground Granulated Blast Furnace
A
Fresh: ↓ Workability (slightly), slow setting time.
Hardened: ↑ Durability (chloride resistance), ↓ heat.
Use: Marine, precast
3
Q
Silica Fume
A
Fresh: ↓ Workability (needs superplasticizer).
Hardened: ↑↑ Strength, ↓↓ permeability.
Use: High-performance concrete (5-10%). Excellent for bridges
4
Q
Limestone
A
Fresh: Slight ↑ workability.
Reduces water demand, therefore, cost is reduced
Hardened: Minimal strength loss
