PSC Precast Manual Homework

Post-tensioning ducts in a precast bulb-tee girder shall be placed within a tolerance of ^+_{-____}

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Answer explanation

APPENDIX B

Pg.25

^K₂= Location of Post - Tensioning Duct

...............⁺_- 1/4 in.

[ ⁺_- 6 mm]

Measurement of camber for comparison to predicted design values should be completed within ___ of the force transfer.

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Answer explanation

APPENDIX B

Pg .3

Camber 25 % of each day production within 72 hours of force transfer

For the double tee precast member, handling devices shall be placed within a tolerance of _____ parallel to the length of the member.

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Answer explanation

APPENDIX B

Pg 13

^q1 = Location of Handling Device Transverse to Length of Member............... ⁺- 6 in.

While providing quality control for a pretensioned I-beam, & the slump is specified as 5 inch, what is the maximum allowable slump including tolerance .

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Answer explanation

6.2.3.3

Slump specified as a single value:

Slump that is more than 4 in. (100 mm)

.............⁺- 1 ¹/₂ in. ( ⁺_- 38 mm)

Test specimens for acceptance testing of concrete compressive strength shall be...

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Answer explanation

6.2.2.10 a Compressive strength

6 x 12 in. cylinders 4 x 8 in. cylinders or 4 in. cubes

For a post-tensioning of a plant-produced member, a minimum initial force of ___ of the jacking force shall be applied to take up slack & provide a starting point for elongation measurement.

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Answer explanation

5.4.4 Tensioning

10 %

For initial tensioning in a pretensioned plant-produced member, an initial force in the range of _____ of the final force shall be applied to each strand to provide a starting point for elongation measurements.

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Answer explanation

5.3.8 Initial Tensioning

5% & 25%

Gauges, jacks, pumps, hoses & connections that make up the stressing equipment shall be calibrated as a system at intervals no greater than _____

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Answer explanation

5.2.4 Gauging Systems

Calibration TENSIONING SYSTEM no greater than 12 months

Gauges, jacks, pumps, hoses & connections that make up the stressing equipment shall be calibrated as a system at intervals no greater than _____

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Answer explanation

5.2.4 Gauging Systems

Calibration TENSIONING SYSTEM no greater than 12 months

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Answer explanation