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FIBER VOID RETAINERS

 
  
 
2.1.7
Form Releasing Agents
Form releasing agents shall be commercial formulations that will not bond
with, stain or adversely affect concrete surfaces.  Agents shall not impair
subsequent treatment of concrete surfaces depending upon bond or adhesion
nor impede the wetting of surfaces to be cured with water or curing
compounds.
2.1.8
Fiber Voids
Fiber voids shall be the product of a reputable manufacturer regularly
engaged in the commercial production of fiber voids.  The voids shall be
constructed of double faced, corrugated fiberboard.  The corrugated
fiberboard shall be fabricated of [wet strength] [standard kraft] paper
liners, impregnated with paraffin, and laminated with moisture resistant
adhesive, and shall have a board strength of 20 kg per square centimeter
275 psi.  Voids which are impregnated with paraffin after construction, in
lieu of being constructed with paraffin impregnated fiberboard, are
acceptable.  Voids shall be designed to support not less than 4900 kg per
square meter 1000 psf.  To prevent separation during concrete placement
fiber voids shall be assembled with steel or plastic banding at 1.22 m 4
feet on center maximum, or by adequate stapling or gluing as recommended by
the manufacturer.  Fiber voids placed under concrete slabs and that are 200
mm 8 inches in depth may be heavy duty "waffle box" type, constructed of
paraffin impregnated corrugated fiberboard.
2.2
FIBER VOID RETAINERS
2.2.1
Polystyrene Rigid Insulation
Polystyrene rigid insulation shall conform to ASTM C 578, Type V, VI, or
VII, square edged.  Size shall be 38 mm 1-1/2 inches thick by 400 mm 16
inches in height by 1 m 3 feet in length, unless otherwise indicated.
2.2.2
Precast Concrete
Precast concrete units shall have a compressive strength of not less than
17 MPa 2500 psi, reinforced with 150 mm by 150 mm by W1.4 WWF 6 inch by 6
inch by W1.4 WWF wire mesh, and 300 mm (height) by 1 m (length) by 40 mm
(thickness) 12 inches (height) by 3 feet (length) by 1-5/8 inches
(thickness) in size unless indicated.
PART 3
EXECUTION
3.1
INSTALLATION
3.1.1
Formwork
Forms shall be mortar tight, properly aligned and adequately supported to
produce concrete surfaces meeting the surface requirements specified in
Section 03300A CAST-IN-PLACE STRUCTURAL CONCRETE and conforming to
construction tolerance given in TABLE 1.  Where concrete surfaces are to
have a Class A or Class B finish, joints in form panels shall be arranged
as approved.  Where forms for continuous surfaces are placed in successive
units, the forms shall fit over the completed surface to obtain accurate
alignment of the surface and to prevent leakage of mortar.  Forms shall not
be reused if there is any evidence of surface wear and tear or defects
which would impair the quality of the surface.  Surfaces of forms to be
reused shall be cleaned of mortar from previous concreting and of all other
SECTION 03100A
Page 6


   


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