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Class A Finish and Class B Finish

 
  
 
Forms, form materials, and form construction are specified in Section 03100A
STRUCTURAL CONCRETE FORMWORK.  Finishing of formed surfaces shall be as
specified herein.  Unless another type of architectural or special finish
is specified, surfaces shall be left with the texture imparted by the forms
except that defective surfaces shall be repaired.  Unless painting of
surfaces is required, uniform color of the concrete shall be maintained by
use of only one mixture without changes in materials or proportions for any
structure or portion of structure that requires a Class A or B finish.
Except for major defects, as defined hereinafter, surface defects shall be
repaired as specified herein within 24 hours after forms are removed.
Repairs of the so-called "plaster-type" will not be permitted in any
location.  Tolerances of formed surfaces shall conform to the requirements
of ACI 117.  These tolerances apply to the finished concrete surface, not
to the forms themselves; forms shall be set true to line and grade.  Form
tie holes requiring repair and other defects whose depth is at least as
great as their surface diameter shall be repaired as specified in paragraph
Damp-Pack Mortar Repair.  Defects whose surface diameter is greater than
their depth shall be repaired as specified in paragraph Repair of Major
Defects.  Repairs shall be finished flush with adjacent surfaces and with
the same surface texture.  The cement used for all repairs shall be a blend
of job cement with white cement proportioned so that the final color after
curing and aging will be the same as the adjacent concrete.  Concrete with
excessive honeycomb, or other defects which affect the strength of the
member, will be rejected.  Repairs shall be demonstrated to be acceptable
and free from cracks or loose or drummy areas at the completion of the
contract and, for Class A and B Finishes, shall be inconspicuous.  Repairs
not meeting these requirements will be rejected and shall be replaced.
3.10.1
Class A Finish and Class B Finish
Class A finish is required [where indicated on the drawings.]  [in the
following areas, [_____].]  Class B finish is required [where indicated on
the drawings] [in the following areas, [_____].]  Fins, ravelings, and
loose material shall be removed, all surface defects over 12 mm 1/2 inch in
diameter or more than 12 mm 1/2 inch deep, shall be repaired and, except as
otherwise indicated or as specified in Section 03100A STRUCTURAL CONCRETE
FORMWORK, holes left by removal of form ties shall be reamed and filled.
Defects more than 12 mm 1/2 inch in diameter shall be cut back to sound
concrete, but in all cases at least 25 mm 1 inch deep.  The Contractor
shall prepare a sample panel for approval (as specified in PART 1) before
commencing repair, showing that the surface texture and color match will be
attained.  Metal tools shall not be used to finish repairs in Class A
surfaces.
3.10.2
Class C and Class D Finish
Class C finish is required [where indicated on the drawings.] [in the
following areas, [_____].]  Class D finish is required [where indicated on
the drawings.] [in the following areas, [_____].]  Fins, ravelings, and
loose material shall be removed, and, except as otherwise indicated or as
specified in Section 03100A STRUCTURAL CONCRETE FORMWORK, holes left by
removal of form ties shall be reamed and filled.  Honeycomb and other
defects more than 12 mm 1/2 inch deep or more than 50 mm 2 inches in
diameter shall be repaired.  Defects more than 50 mm 2 inches in diameter
shall be cut back to sound concrete, but in all cases at least 25 mm 1 inch
deep.
SECTION 03300A
Page 48


   


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