Post-Tensioned Concrete: Key Concepts and Best Practices Test Questions and Answers

Post-Tensioned Concrete: Key
Concepts and Best Practices Test
Questions and Answers
1 - Reverse curvature of tendons in post-tensioned concrete construction can be avoided by
______________________.

1 - Increasing the psi of the concrete

2 - Increasing the tension in the tendons

3 - Providing additional support bars for the tendons

4 - Providing additional tendons - Answer 3 - Providing additional support bars for the
tendons

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 37



2 - A watertight cap should be installed on an encapsulated system for post-tensioned concrete
within ______hours after stressing is complete.



1 - 12 hours

2 - 24 hours

3 - 36 hours

4 - 72 hours - Answer 2 - 24 hours

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 62



3 - Where two or more extensions of the stressing jack are required to achieve the required
elongation for post-tensioned concrete, the final pull on the jack should not exceed
_____________%.

1 - 15

2 - 60

3 - 75

4 - 80 - Answer 2 - 60

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 48



4 - Tendons in post-tensioned concrete should not be stressed until the concrete has reached
about ________% of its full strength.

1 - 60

2 - 65

3 - 75

, 4 - 80 - Answer 3 - 75

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 8



5 - A minimum clearance of _________inches should be maintained around all block outs in
post-tensioned construction.

1 - 4 inches

2 - 6 inches

3 - 8 inches

4 - 12 inches - Answer 2 - 6 inches

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 34



6 - If a tendon is stressed at both ends, what is the recommended length of tail to leave outside
the edge form at each end?



1 - 6 inches

2 - 8 inches

3 - 10 inches

4 - 12 inches - Answer 4 - 12 inches

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 32



7 - When back stressing a barrier cable, the end anchor should be installed to a force of ___%



1 - 50 %

2 - 60 %

3 - 75 %

4 - 80 % - Answer 4 - 80 %

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 67



8 - Not more than _______ 0.5 inch diameter tendons should be banded together in a group in
post-tensioned concrete.

1-3

2-4

3-5

4 - 6 - Answer 3-5

Training and Certification of Field Personnel for Unbonded Post-Tensioning Page 34