Advantages
Very strong in tension
Considerable compressive strength although box section is strongest
Tension and compression act on only top and bottom of ‘I’ section so holes can be drilled through to reduce weight and provide utility access
Speed of erection
Disadvantages
Time to site – slow
Cost
Loss of strength in fire although it can be protected by intumescent paint or foam
Corrosion
Skilled [...]
Buildings and their materials can decay and become unsafe as a result of a number of different factors…
Life expectancy
Causes of deterioration
Wear
Biodegredation
Insect attack
Corrosion
Impact
Erosion
Ground movement
The building will deteriorate unless steps are taken to slow the decay process.
Advantages
Good compressive strength
Short lead in time
Disadvantages
Bulky
Curing time
Cancer, carbonation, corrosion, acid rain
Accurate set out needed
Skilled labour for shuttering
Workmanship risks
