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Preston Square, Block D 0341Ottawa, Ontario PRECAST CONCRETE STAIRSProject File 05113 Page

04 J AN 22 03063.03414.1

PART 1) - GENERAL

a) WORK INCLUDED

i) Comply with Division 1, General Requirements and documents referred to therein.

ii) Provide labour, materials, products, equipment and services to complete precast concrete stairs

work, including but not limited to:

(1) design;

(2) structural steel inserts, anchor units, plates, dowels and the like cast into precast concrete

members; loose structural steel anchor units, angles, supplementary framing plates and the like

required to connect precast concrete units to the structural elements of the building and to make

connections between precast concrete units, and grouting of joints where required.

iii) The supply only of materials under this Section including but not limited to:

(1) anchor bolts;

(2) structural steel inserts, anchor units, plates and the like, cast into cast-in-place concrete required

for the connection or the support of precast concrete units;

(3) special reinforcement, which may be required around cast-in-place anchor units when such

reinforcement is required to maintain the integrity of the structural element.

iv) Comply with Section 03300, Cast-In-P lace Concrete, as applicable.

v) Comply with the requirements of CAN3-A23 Series, except where greater requirements are

specified herein.

b) DESIGN CRITERIA

i) Design precast concrete stairs and connections to safely sustain or transmit loads shown o

implied in accordance with the applicable building code, CAN3-A23 Series and CSA S16.1 as

appropriate, and other requirements of authorities having jurisdiction. Design precast concrete

units to carry handling and service loads, including railing loads transferred to units.

ii) Have the work of this Section designed by a professional engineer registered to design structure

in the Province of the Place of the Work.

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04 J AN 22 03063.03414.2

iii) In addition to the gravity loads and forces shown on the Drawings and/or required by the governing

codes, the design of precast concrete units and assemblies shall include for the effects caused by

moisture and temperature changes, shrinkage, creep in component materials and handling, within

deflection limitations governing structural design.

iv) Bearing areas shall be reinforced against diagonal tension, splitting, rupture and flexure. Extra ties

stirrups and reinforcing bars shall be placed at support points. No bearing pressure shall be

allowed in edges of unreinforced sections.

v) Do not incorporate details which invalidate the design assumptions without the review of the

Consultant. Be responsible for resulting alterations required to the structure.

c) SUBMITTALS - SHOP DRAWINGS

i) Submit shop and erection drawings fully describing precast concrete units. Show, among othe

items, the following:

(1) location of each unit in the completed structure;

(2) dimensions of each unit including holes, irregularities;

(3) reinforcing details and grade of reinforcing;

(4) concrete strengths, mix design, and any admixture proposed;

(5) concrete finishes and steel finishes;

(6) jointing clearances and clearances between the units and the structural building framework;

(7) complete connection, anchorage and insert details including materials, size and length of welds

Provide other trades with detailed drawings and setting information so that connection material can

be readily erected in its required location;

(8) identifying marks for each precast concrete unit;

(9) location and details of lifting hooks and handling points;

(10) sequence of erection and any special handling instructions or bracing required;

(11) special precautions to be taken by other trades affecting work of this Section.

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04 J AN 22 03063.03414.3

ii) Shop and erection drawings shall bear the seal and signature of a professional engineer registered

to design structures in the Province of the Place of the Work.

d) SUBMITTALS - TEST REPORTS/CERTIFICATES

i) Submit test reports for concrete quality control for each unit supplied as part of the work of thi

Section as specified in CAN3 A23.4.

ii) Connections and special prefabricated inserts may be required to be tested as part of the work o

this Section. Submit complete design calculations, if requested.

iii) Prior to commencement of the work, and at no extra cost to the Owner, provide the following

certificates prepared by an approved inspection company:

(1) Aggregates: Certification that coarse and fine aggregates proposed for the work comply with

Specification requirements.

iv) Cement: Results of physical and chemical tests required by CAN/CSA-A5.

v) Reinforcing steel: Test data from a Canadian testing company that each size and grade o

reinforcing steel meets Specification requirements. Where reinforcing steel is of Canadian

manufacture, suitable mill test reports will be sufficient.

e) QUALITY ASSURANCE - QUALIFICATIONS

i) Manufacturer of precast concrete stairs shall be certified in accordance with the requirements o

CSA A251 class AC, PC, SC products unless otherwise approved by the Consultant.

ii) Companies with a proven record of satisfactory installation on projects similar in size and nature

will be acceptable subject to acceptance by the Consultant.

f) DELIVERY, STORAGE, AND HANDLING

i) Handle and store material in such a manner that no damage or soiling will be done to the materials

or to the structure.

ii) Transport precast concrete units carefully to prevent damage.

iii) Protect depressions, holes and reglets from water and ice during freezing weather.

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04 J AN 22 03063.03414.4

iv) Store precast concrete units clear of ground, in manner to prevent stress, warp, twist and to afford

free movement of air on all sides of each unit.

v) Secure waterproof covering entirely over each stockpile when work is not in progress. Protec

stockpile at all times from weather, dirt and damage.

g) ENVIRONMENTAL CONDITIONS

i) Air and surface temperatures shall be minimum 7C during grouting and temperature shall be

maintained above this minimum until grout has cured.

PART 2) - PRODUCTS

a) MATERIALS

i) Materials: Comply with the requirements of Section 03300, Cast-In-P lace Concrete and CAN3

A23.4, except where greater requirements are specified herein.

ii) Steel anchorage: CAN/CSA-G40.21, Grade 44W.

iii) Bolts: ASTM A307 and A325.

iv) Primer: CISC/CPMA 2-75a.

v) Grout: "Embeco" non-shrink grout suitable for dynamic and repetitive loading, by Chemrex Inc

(M.B.T.) or other approved manufacture, having a minimum compressive strength of 30 MPa

(4500 psi) at 28 days.

b) CONCRETE MIX DESIGN

i) Concrete mix shall be designed by fabricator of the precast concrete stairs in accordance with

CAN/CSA A23.1 to meet the requirements of the Specifications.

ii) Provide normal weight concrete having a compressive strength not less than 35 MPa (5000 psi) a

28 days, maximum water/cementing materials ratio 0.40.

c) FABRICATION

i) Fabricate precast concrete units in accordance with CAN3-A23.4.

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04 J AN 22 03063.03414.5

ii) Batch cement and aggregates used in the manufacture of the concrete carefully and separately by

weight.

iii) Fabricate precast concrete stairs using steel forms in accordance with reviewed shop drawings

with tight corners and joints, correctly aligned without indentations or protrusions.

iv) Notify the Consultant when the first set of precast concrete forms are ready for Consultant's

review.

v) Fabricate units true to dimensions, plumb and square, in true planes, with accurate definition a

corners and arrises, free from warp, waves, twist, cracks, checks, chips and nicks or broken

edges, spalled or harsh areas.

vi) Provide minimum 19 mm (3/4") concrete cover over reinforcing steel, with full bond.

vii) Accurately position reinforcing steel and tie together to maintain position during casting; provide

recesses, inserts and built-ins required.

viii) Mark each precast concrete unit to correspond to identification mark on shop drawings for location

Mark units with date cast. Marks shall be in approved location, concealed in the finished work.

ix) Perform welding in accordance with CSA W59 and CSA W186. Weld steel using qualified welders

fully certified in accordance with requirements of CSA W47.1 and W55.3. Take care duringwelding to minimize the effect of welding heat. Design welds to prevent tearing at ends of welds.

x) Supply and install weld plates for attachment of balustrades provided under other Section.

d) FINISHES

i) Concrete finish: Dense, smooth, even concrete free of defects such as honeycombing, voids, los

of fines and the like. Surfaces shall be smooth from steel forms for treads, risers and sides

Walking surfaces shall be smooth finished with integral slip resistant ribs to approved design

Underside of units shall be steel trowel finish. Natural concrete colour of uniform shade andhomogeneous appearance. Abrupt shading variations within units or between units shall not be

permitted.

ii) Steel connections and anchorage exposed to view in the finished work shall be prime painted.

e) SOURCE QUALITY CONTROL

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04 J AN 22 03063.03414.6

i) The Owner may appoint an independent testing and inspection company to make inspections o

perform tests as directed.

f) FABRICATION TOLERANCES

i) Conform to the more stringent of tolerance limits set out in ACI 347 and CAN3-A23.4.

PART 3) - EXECUTION

a) EXAMINATION

i) Before commencing installation, examine the work of other Sections to which the precast concrete

work will be attached or on which it will be supported.

ii) Ensure that bearing surfaces are clean, smooth and level, and that provision has been made fo

proper anchorage.

iii) Report discrepancies in accuracy and suitability in the location, bearing and retaining of structura

members which will adversely affect the installation and permanency of the work of this Section

iv) Commencement of installation shall indicate acceptance of the work of other Sections, upon which

the work of this Section depends.

b) INSTALLATION

i) Comply with local and provincial safety regulations.

ii) Install units level, straight, plumb, square and true. Shim as required using acceptable materials

and methods.

iii) Provide connections which can be adjusted to accommodate the tolerances specified for the

structure. Refer to Section 03300, Cast-In-Place Concrete and Section 05120, Structural Steel

iv) Adequately fasten precast concrete units in place to structure by positive mechanical means; weld

connections, use bolts with lock washers or tack-weld nut to bolt.

v) Do not cut openings in precast concrete units on site unless authorized by the Consultant.

vi) Grout and finish flush, voids and joints between precast concrete units and structure at top and

bottom of stair units.

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04 J AN 22 03063.03414.7

vii) Touch-up prime painted steel where damaged during installation with primer. Clean field welds

with wire brush and touch-up welds with primer.

c) CLEANING

i) Clean surfaces exposed to view after joint treatment is complete and grout has cured.

ii) Use fibre brushes, water and mild cleaning agents as recommended by manufacturer of the

precast concrete units.

iii) Remove deposits of foreign material, dirt, soil and stains. Do not use materials, tools or method

which will damage the units. Rinse thoroughly with clean water after cleaning.

iv) Protect adjoining work from damage during cleaning.

d) DEFECTIVE WORK

i) Precast concrete units which are damaged in handling operation shall be replaced.

ii) Units damaged after installation shall be repaired or replaced as directed by the Consultant

Where repairs are permitted, they shall be done in accordance with the recommendations of the

manufacturer using a mix design to match the adjacent area and applied with an approved

bonding agent.

END OF SECTION

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