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E.Patching:  If core test results are satisfactory and precast concrete units comply with requirements, clean and dampen core holes and solidly fill with precast concrete mix that has no coarse aggregate, and finish to match adjacent precast concrete surfaces.

F.  Defective Work:  Architectural precast concrete units that do not comply with acceptability

requirements in PCI MNL 117, including concrete strength, manufacturing tolerances, and color and texture range are unacceptable. Chipped, spalled or cracked units may be repaired, if repaired units match the visual mock-up.  The Architect reserves the right to reject any unit if it does not match the accepted samples and visual mock-up.  Replace unacceptable units with precast concrete units that comply with requirements.

PART 3 – EXECUTION

3.1

 PREPARATION

A.

Deliver anchorage devices that are embedded in or attached to the building structural frame or foundation before start of such work.  Provide locations, setting diagrams, and templates for the proper installation of each anchorage device.

3.2

 EXAMINATION

A.

Examine supporting structural frame or foundation and conditions for compliance with requirements for installation tolerances, true and level bearing surfaces, and other conditions affecting performance.  Proceed with installation only after unsatisfactory conditions have been corrected.

B.

Do not install precast concrete units until supporting cast-in place concrete building structural framing has attained minimum allowable design compressive strength or supporting steel or other structure is structurally ready to receive loads from precast.

3.3  ERECTION

A.

Install loose clips, hangers, bearing pads and other accessories required for connecting architectural precast concrete units to supporting members and backup materials.

B.

Erect architectural precast concrete level, plumb and square within the specified allowable tolerances.  Provide temporary supports and bracing as required to maintain position, stability, and alignment of units until permanent connections are completed.

1.Install temporary steel or plastic spacing shims or bearing pads as precast concrete units are being erected.  Tack weld steel shims to each other to prevent shims from separating.

2.

Maintain horizontal and vertical joint alignment and uniform joint width as erection progresses.

3.

Remove projecting lifting devices and use sand-cement grout to fill voids within recessed lifting devices flush with surface of adjacent precast concrete surfaces when recess is exposed.

4.

Unless otherwise shown provide for uniform joint widths of 3/4 inch (19mm)

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