Following are the advantages and disadvantages of using prestressed concrete.
(1) Advantages:
(i)In prestressed concrete, complete section is utilized for resisting loads. This will reduce the size of the member and hence the dead weight of the structure.
(ii)The section is usually in compression. As the concrete is very strong in resisting compression, serviceability behaviour of the member is improved. Crackfree member will give better appearance. Also, prestress acts as cambering of the member. Hence, under the service loads, it has less deflection.
(iii)Crack free prestressed concrete members require less maintenance and the structure will have a longer life than reinforced concrete structure. Also, the crack free member provides better corrosion protection for steel.
(iv)It has better resistance to fatigue and impact.
(v)Overall cost is reduced in many cases.
(2) Disadvantages:
(i)It requires the use of high grade concrete and steel, complicated formwork and skilled labour. This increases the cost of the structure.
(ii)Manufacturing requires controlled working.
(iii)There are greater initial loss of prestress.
(iv)End anchorages and anchor plates are required.
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