PSC U1

As per India standard code of practice for prestressed concrete (IS:1343-2012) the minimum grades of concrete to be used for post-tensioned and pre-tensioned structural elements are respectively

• M20 for both

• M40 and M30

• M15 and M30

• M30 and M40

The grade of concrete used for prestressed member lies in the range of

• M20 to M30

• M30 to M60

• M70 to M100

• M100 to M150

In prestressed concrete members, steel is under

• Tension

• Compression

• Torsion

• Bending

The purpose of reinforcement in prestressed concrete is

• To provide adequate bond stress

• To resist tensile stress

• To impart initial compressive stress in concrete

• All of these

The earliest examples of wooden barrel construction by force-fitting of metal bands and shrink-fitting of metal tires of wooden wheels indicate the art of

• Pre tensioning

• Post tensioning

• Pre stressing

• Jacking

The importance of using high strength concrete and high strength steel was introduced by

• Euguen Freyssinet

• Jackson

• Dohring

• Koenon

The structures of prestressed concrete are less liable to

• Bending

• Loading

• Placing

• Cracks

The chemical prestressing is also called as

• Self stressing

• Whole stressing

• Half stressing

• Model stressing

In pre-tensioning system

• The member is cast first allowed by tensioning of high tensile wires

• The member is prestressed by external anchors

• The high-tensile wires are tensioned before placing concrete in forms

• None of the above

In post-tensioning system

• Wires are first tensioned followed by concreting

• Tensioning of wires and concreting is simultaneously done

• The wires are tensioned against hardened concrete

• None of the above