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    accelerated heat curing using low-pressure live steam or radiant heat and moisture.  Cure units until   

    the compressive strength is high enough to ensure that stripping does not have an effect on the    

    performance or appearance of the final product.

Q.  Repair damaged architectural precast concrete units to meet acceptability requirements of PCI MNL

     117.

2.18

 INSULATED PANEL CASTING

Delete this Article if integrally insulated panels are not required.

A.

Cast and screed supported wythe over mold.

B.

Place insulation boards, abutting edges and ends of adjacent boards.  Insert wythe connectors through insulation, and consolidate concrete around connectors according to connector manufacturer’s written instructions.

C.

Cast and screed top wythe to meet required finish.

2.19  FABRICATION TOLERANCES

A.

Fabricate architectural precast concrete units straight and true to size and shape with exposed edges and corners precise and true so each finished unit complies with PCI MNL 117 product tolerances as well as position tolerances for cast-in items.

Select paragraph above or paragraph and subparagraphs below.  Usually retain above unless tolerances for Project deviate from PCI recommendations.  PCI MNL 117 product tolerances, listed below, are standardized throughout the industry.  For architectural trim units such as sills, lintels, coping, cornices, quoins, medallions, bollards, benches, planters, and pavers, tolerances are listed in PCI MNL 135.

B.

Fabricate architectural precast concrete units straight and true to size and shape with exposed edges and corners precise and true so each finished unit complies with the following product tolerances.

1.  Overall Height and Width of Units, Measured at the Face Exposed to View:  As follows:

           a.  10 feet (3 m) or under, Plus or Minus 1/8 inch (3 mm).

b.  10 to 20 feet (3 to 6 m), Plus 1/8 inch (3 mm), Minus 3/16 inch (5 mm).

c.  20 to 40 feet (6 to 12 m), Plus or Minus 1/4 inch (6 mm).

d.Each additional 10 feet (3 m), Plus or Minus 1/16 inch (1.5 mm).

2.  Overall Height and Width of Units, Measured at the Face Not Exposed to View:  As follows:

a.  10 feet (3 m) or under, Plus or Minus 1/4 inch (6 mm).

b.  10 to 20 feet (3 to 6 m), Plus ¼ inch (6 mm), Minus 3/8 inch (10 mm).

c.  20 to 40 feet (6 to 12 m), Plus or Minus 3/8 inch (10 mm).

d.  Each additional 10 feet (3 m), Plus or Minus 1/8 inch (3 mm).

3.  Total Thickness or Flange Thickness: Plus ¼ inch (6 mm), Minus 1/8 inch (3 mm).

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