Question

For prestressed structural elements, high strength concrete is used primarily because

• A. both shrinkage and creep are more
• B. shrinkage is less but creep is more
• C. modulus of elasticity and creep values are higher
• D. high modulus of elasticity and low creep

Answer 1

The correct option is D high modulus of elasticity and low creep

High strength concrete is less liable to shrinkage cracks and has a higher modulus of elasticity and smaller ultimate creep strain, resulting in a smaller loss of prestress in steel. The use of high strength concrete results in a reduction in cross-sectional dimensions of prestressed concrete structural elements. With a reduced dead weight of the material, longer spans become technically and economically practicable.