DIVISION 3
1
Cast-in-Place Concrete
GENERAL
1.1
1.2
Related Sections
1.1.1
Section 03100 – Concrete Forms and Accessories.
1.1.2
Section 03200 – Concrete Reinforcement.
1.1.3
Section 02770 – Concrete Walks, Curbs and Gutters
Standard
1.2.1
1.3
1.4
Concrete materials and methods of construction: to CAN/CSA-A23.1 unless
otherwise specified.
Inspection
1.3.1
Concrete testing: to CAN/CSA-A23.2 by testing laboratory approved by City.
1.3.2
Give Engineer minimum 24 h notice before each concrete pour.
Certificates
1.4.1
2
Section 03300
Page 1
Provide certification that plant, equipment, and materials to be used in concrete
comply with requirements of CAN/CSA-A23.1.
PRODUCTS
2.1
Materials
2.1.1
Portland cement: to CAN/CSA-A5, Type 10.
2.1.2
Supplementary cementing materials: to CAN/CSA-A23.5.
2.1.3
Water: to CAN/CSA-A23.1.
2.1.4
Aggregates: to CAN/CSA-A23.1. Coarse aggregates to be normal density.
2.1.5
Air entraining admixture: to ASTM C 260.
2.1.6
Chemical admixtures: to ASTM C 494. City to approve accelerating or set retarding
admixtures during cold and hot weather placing.
2.1.7
Shrinkage compensating grout: premixed compound consisting of non-metallic
aggregate, Portland cement, water reducing and plasticizing agents.
2.1.7.1
Compressive strength: 50 Mpa at 28 days.
September 2004
DIVISION 3
Cast-in-Place Concrete
Section 03300
Page 2
2.1.8
Non premixed dry pack grout: composition of non metallic aggregate Portland
cement with sufficient water for the mixture to retain its shape when made into a ball
by hand and capable of developing compression strength of 30 MPa at 28 days.
2.1.9
Waterstops: extruded ribbed PVC strips, 12 MPa tensile strength, minimum 350%
elongation, minus 45 C to plus 80 C working temperature.
2.1.10 Premoulded joint fillers: Bituminous impregnated fiber board: to ASTM D1751.
2.1.11 Joint sealer/filler: grey, to CAN/CGSB-19.24, Type1, Class B; black, cold applied,
to CAN/CGSB-19.20, Type 1.
2.1.12 Floor hardener: non-metallic, pre-mixed.
2.1.13 Sealer: boiled linseed oil, mixed with mineral spirits 1:1, proprietary poly-siloxane
resin blend.
2.1.14 Dovetail anchor slots: minimum 0.6 mm thick galvanized steel, insulation filled.
2.1.15 Dampproofing: Emulsified
CAN/CGSB-37.2.
asphalt,
mineral
colloid
type,
unfilled:
to
2.1.16 Polyethylene film 0.15 mm: to CGSB 51-34.
2.1.17 All other concrete materials: to CAN/CSA-A23.1.
2.2
Concrete Mixes
2.2.1
Proportion normal density concrete in accordance with CAN/CSA-A23.1,
Alternative 1.
2.2.2
Cement: Type 10 Portland cement.
2.2.3
Minimum 28 day compressive strengths and exposure classifications:
2.2.3.1
Suspended parking floors and ramps: 35 MPa.
2.2.3.2
Pavements, walks, curbs and exposed site concrete: 32 MPa.
2.2.3.3
Retaining structures, bridge decking, and other structures: as specified
by the Professional Engineer responsible for the design.
2.2.3.4
All other concrete: 25 MPa.
2.2.4
Nominal size of coarse aggregate: Clause14 of CAN/CSA-A23.1.
2.2.5
Slump: to Table 6 of CAN/CSA-A23.1.
2.2.6
Air content: all concrete to contain purposely entrained air in accordance with
Table10 of CAN/CSA-A23.1.
September 2004
DIVISION 3
3
Cast-in-Place Concrete
Section 03300
Page 3
2.2.7
Admixtures: to Clause 6 of CAN/CSA-A23.1.
2.2.8
Polypropylene fibres (where indicated): add 1 kg/m3, at plant, with minimum 7
minutes mixing time.
EXECUTION
3.1
3.2
Preparation
3.1.1
Obtain Engineer's approval before placing concrete. Provide 24 h notice prior to
placing of concrete.
3.1.2
Pumping of concrete is permitted only after approval of equipment and mix.
3.1.3
Ensure reinforcement and inserts are not disturbed during concrete placement.
3.1.4
Prior to placing of concrete obtain Engineer’s approval of proposed method for
protection of concrete during placing and curing in adverse weather.
3.1.5
Maintain accurate records of poured concrete items to indicate date, location of
pour, quality, air temperature and test samples taken.
3.1.6
In locations where new concrete is dowelled to existing work, drill holes in existing
concrete. Place steel dowels and pack solidly with epoxy grout to anchor and hold
dowels in positions as indicated.
3.1.7
Do not place load upon new concrete until authorized by Engineer.
Construction
3.2.1
Do cast-in-place concrete work in accordance with CAN/CSA-A23.1.
3.2.2
Sleeves and Inserts
3.2.3
3.2.2.1
No sleeves, ducts, pipes or other openings shall pass through joists,
beams, column capitals or columns, except where indicated or approved
by Engineer.
3.2.2.2
Where approved by Engineer, set sleeves, ties, pipe hangers and other
inserts and openings as indicated or specified elsewhere. Sleeves and
openings greater than 100 x 100 mm not indicated on the drawings,
must be approved by Engineer.
3.2.2.3
Do not eliminate or displace reinforcement to accommodate hardware.
If inserts cannot be located as specified, obtain approval of
modifications from Engineer before placing of concrete.
Anchor bolts:
3.2.3.1
Place anchor bolts to templates under supervision of appropriate trade
prior to placing concrete.
September 2004
DIVISION 3
Cast-in-Place Concrete
3.2.4
3.2.5
3.2.6
Finishing
3.2.4.1
Formed surfaces exposed to view: sack rubbed finish in accordance
with CAN/CSA-A23.
3.2.4.2
Interior floor slabs to be left exposed or to receive epoxy, carpet, sheet
vinyl or other covering requiring a smooth surface: initial finishing
operations followed by final finishing comprising mechanical floating
and steel trowelling as specified in CAN/CSA-A23.1 to produce hard,
smooth, dense trowelled surface free from blemishes; finishing
tolerance classification: Flat.
3.2.4.3
Hardened floor finish: as specified above in conjunction with
application of hardener applied 2.44 kg/m2.
3.2.4.4
Floor slabs to receive mortar bed for ceramic or quarry tile: screed to
correct grade to provide broomed texture; finishing tolerance
classification: Conventional.
3.2.4.5
Equipment pads: smooth trowelled surface; finishing tolerance
classification: Very Flat.
3.2.4.6
Pavements, walks, curbs and exposed site concrete: screed to plane
surfaces and float using aluminum, magnesium, or wood floats. Round
edges and provide joint spacings using standard tools. Trowel smooth
followed by lightly brushed non-slip finish.
Waterstops
3.2.5.1
Install waterstops to provide continuous water seal. Do not distort or
pierce waterstop in such a way as to hamper performance. Do not
displace reinforcement when installing waterstops. Use equipment to
manufacturer's requirements to field splice waterstops. Tie waterstops
rigidly in place.
3.2.5.2
Use only straight heat sealed butt joints in field. Use factory welded
corners and intersections.
Control Joints and Expansion Joints
3.2.6.1
3.2.6.2
3.2.7
Section 03300
Page 4
Cut and form control joints to induce shrinkage cracking during
concrete curing in slabs on grade at locations indicated, in accordance
with CAN/CSA-A23.1 and as indicated on Standard Drawing C5. Fill
with specified joint sealer/filler when specified by Engineer.
Install expansion joints as specified in Section 02770 and as indicated
on Standard Drawings C1 and C5.
Joint Fillers
September 2004
DIVISION 3
Cast-in-Place Concrete
3.2.8
3.2.9
Section 03300
Page 5
3.2.7.1
Furnish filler for each joint in single piece for depth and width required
for joint, unless otherwise authorized by Engineer. When more than
one piece is required for a joint, fasten abutting ends and hold securely
to shape by stapling or other positive fastening.
3.2.7.2
Locate and form isolation joints as indicated. Install joint filler.
3.2.7.3
Use 12 mm thick joint filler to separate slabs-on-grade from vertical
surfaces and extend joint filler from bottom of slab to finished slab
surface unless indicated otherwise.
Cold Weather Requirements
3.2.8.1
When air temperature is at or below 5o C during placement or within
the 24 hours following, protect concrete in accordance with CAN/CSAA23.1.
3.2.8.2
Provide enclosures for heating such that air circulation is maintained.
Protect concrete from alternating freeze-thaw cycles for a minimum of
14 days.
3.2.8.3
Withdraw protection and heating gradually such that air temperature
around concrete does not drop by more than 15o C per day.
Hot Weather Requirements
3.2.9.1
When air temperature is at or above 23o C place concrete in accordance
with CAN/CSA-A23.1. If concrete temperature exceeds limits
specified in CAN/CSA-A23.1 suspend operations until constituent
materials of concrete are cooled.
3.2.9.2
Retarding admixtures to be used only upon written approval of the City.
3.2.10 Curing
3.2.10.1
Cure and protect concrete in accordance with CAN/CSA-A23.1, except
that curing compounds shall not be used where bond is required by
subsequent topping or coating.
3.2.11 Sealing
3.3
3.2.11.1
Following curing, apply linseed oil or poly-siloxane resin blend sealer
treatment as indicated.
3.2.11.2
Apply two even coats of linseed oil mixture to clean dry surfaces, each
at 8 m2 /L. Allow first coat to dry before applying second coat.
3.2.11.3
Apply poly-siloxane resin blend sealer at 4 m2 /L.
Field Quality Control
September 2004
DIVISION 3
Cast-in-Place Concrete
Section 03300
Page 6
3.3.1
Inspection and testing of concrete and concrete materials to be carried out by a
Testing Laboratory approved by Owner in accordance with CAN/CSA-A23.1.
3.3.2
Prepare one set of three test cylinders for every 10 m3 of concrete placed. A
minimum of one set of test cylinders is required for every day during which concrete
is placed. Cure cylinders on job site under same conditions as concrete which they
represent.
3.3.3
Conduct slump and air content tests with each set of cylinders.
3.3.4
Engineer may take additional test cylinders.
3.3.5
Non-destructive Methods for Testing Concrete shall be in accordance with
CAN/CSA-A23.2.
3.3.6
Inspection or testing by Engineer will not augment or replace Contractor quality
control nor relieve him of his contractual responsibility.
END OF SECTION 03300
September 2004