2013 4 29 ROSEMARY BEACH PROJECT MANUAL.pdf

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Anderson Engineers, P.A. 12041 – ROSEMARY BEACH OWNER’S CENTER C. Immediately remove and replace tendons that have damaged strand. 3.5 CONCRETE PLACEMENT A. Place concrete as specified in Section 033000 "Cast-in-Place Concrete." Ensure compaction of concrete around anchorages. B. Ensure that position of tendon and nonprestressed-steel reinforcement does not change during concrete placement. Reposition tendons and nonprestressed-steel reinforcement moved during concrete placement to original location. C. Ensure that method of concrete placement does not damage tendon sheathing. Do not support pump lines, chutes, or other concrete-placing equipment on tendons. 3.6 TENDON STRESSING A. Calibrate stressing jacks and gages at start of project and at least every six months thereafter. Keep copies of calibration certificates for each jack-and-gage pair on Project site that are available for inspection. Exercise care in handling stressing equipment to ensure that proper calibration is maintained. B. Stress tendons only under supervision of a qualified post-tensioning superintendent. C. Do not begin stressing operations until concrete strength has reached 3000 psi as indicated by compression tests of field-cured cylinders. D. Complete stressing within 96 hours of concrete placement. E. If concrete has not reached required strength, obtain Architect's approval to partially stress tendons and delay final stressing until concrete has reached required strength. F. If detensioning and restressing of tendon is required, discard wedges used in original stressing and provide new wedges. G. Mark and measure elongations according to PTI's "Field Procedures Manual for Unbonded Single Strand Tendons." Measure elongations to closest 1/8 inch. H. Submit stressing records within one day of completion of stressing. If discrepancies between measured and calculated elongations exceed plus or minus 7 percent, resolve these discrepancies to satisfaction of Architect. I. Prestressing will be considered acceptable if gage pressures shown on stressing record correspond to required stressing force and calculated and measured elongations agree within 7 percent. J. If measured elongations deviate from calculated elongations by more than 7 percent, additional testing, restressing, strengthening, or replacing of affected elements may be required. 3.7 TENDON FINISHING A. Do not cut strand tails or cover anchorages until stressing records have been reviewed and approved by Architect. UNBONDED POST-TENSIONED CONCRETE 033816 - 6
Anderson Engineers, P.A. 12041 – ROSEMARY BEACH OWNER’S CENTER B. Cut strand tails as soon as possible after approval of elongations. C. Install caps and sleeves on intermediate anchorages within one day of stressing. D. Cut strand tails and install caps on stressing-end anchorages within one day of Architect's acceptance of elongations. E. Patch stressing pockets within one day of cutting strand tail. Clean inside surface of pocket to remove laitance or post-tensioning coating before installing patch material. Finish patch material flush with adjacent concrete. 3.8 FIELD QUALITY CONTROL A. Testing Agency: Owner will engage a qualified testing agency to perform tests and inspections. 1. Before concrete placement, testing agency will inspect the following for compliance with post-tensioning installation drawings and the Contract Documents: a. Location and number of tendons. b. Tendon profiles and cover. c. Installation of backup bars, hairpins, and other nonprestressed reinforcement shown on post-tensioning installation drawings. d. Installation of pocket formers and anchorage devices. e. Repair of damaged sheathing. f. Connections between sheathing and anchorage devices. 2. Testing agency will record tendon elongations during stressing. 3. Testing agency will immediately report deviations from the Contract Documents to Architect. 3.9 PROTECTION A. Do not expose tendons to electric ground currents, welding sparks, or temperatures that would degrade components. B. Protect exposed components within one workday of their exposure during installation. C. Prevent water from entering tendons during installation and stressing. D. Provide weather protection to stressing-end anchorages if strand tails are not cut within 10 days of stressing the tendons. 3.10 REPAIRS A. Submit repair procedure to Architect for evaluation and approval. B. Do not proceed with repairs requiring removal of concrete unless authorized in writing by Architect. END OF SECTION 033816 UNBONDED POST-TENSIONED CONCRETE 033816 - 7
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2013 4 29 ROSEMARY BEACH PROJECT MANUAL.pdf

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