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Concrete (Advantages (Strong in compression, Far greater strength than…
Concrete
Advantages
Strong in compression
Far greater strength than cement
Cheaper than cement
Reinforced concrete via steel increases the concretes tension
Post-tensioned (post-stressed) Concrete
After setting & curing, wires are pulled through the slab & anchored to plates at one end and tensioned at the other
When a compressive stress is gained & the tensioned is gained the cables are left in this state
Formed when concrete is cast with tubes run-in through the slab
Cement slurry is injected into tubes to prevent corrosion of steel
Concrete Cancer
When the steel corrodes it expands which causes the concrete to crack
Making the structure unstable
When reinforcing steels corrode
Disadvantages
Heavy
Cracks
Composite material
Consists of cement, sand & aggregate
Pre-tensioned (pre-stressed) Concrete
Created when concrete is cast over a series of steel rods or cables that have been tensioned prior to pouring
Slump test (Wet mixture test)