TOPIC 1-Materials and Prestressing Applications

What is the primary purpose of prestressing concrete?

• To improve performance by pre-compressing concrete

• To increase tensile strength

• To reduce the weight of concrete

• To enhance aesthetic appeal

Which method is used to manufacture precast prestressed concrete products?

• Post-tensioning

• Casting

• Reinforcement

• Pre-tensioning

What is a key advantage of prestressed concrete over traditional reinforced concrete?

• Lower cost

• Reduced self-weight

• Higher tensile strength

• Easier to work with

What is the minimum characteristic strength of concrete for pre-tensioned prestressing?

• 50 N/mm²

• 25 N/mm²

• 35 N/mm²

• 40 N/mm²

What type of tendon is used when there is adequate bond between the prestressing tendon and concrete?

• Post-tensioned tendon

• Pre-tensioned tendon

• Bonded tendon

• Unbonded tendon

Which of the following is a disadvantage of prestressed concrete?

• Less aesthetic appeal

• Lower durability

• Higher weight

• Requires skilled technology

What is the main material used in prestressed concrete?

• Steel

• Plastic

• Wood

• Glass

What is the purpose of using high strength concrete in prestressing?

• To simplify construction

• To increase weight

• To avoid large deformation

• To reduce costs

Which of the following structures is NOT typically made with prestressed concrete?

• Water storage tanks

• Nuclear reactor vessels

• Bridges

• Residential homes

What is the main difference between post-tensioning and pre-tensioning?

• Location of construction

• Timing of tension application

• Cost of materials

• Type of concrete used