CONCRETE PAVEMENTS GUELPH TRANSIT OPERATIONS & MAINTENANCE SECTION WATSON ROAD FACILITY PAGE 1 OF 7 WATER RECLAMATION PROJECT JUNE 2013

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1 WATSON ROAD FACILITY PAGE 1 OF 7 PART 1 - GENERAL 1.1 Description The work covered by this Section shall be all labour, materials, equipment, and supervision necessary to complete all concrete work shown on the drawings and as specified herein including the following:.1 Concrete slabs on grade including walkways, sidewalks, control joints and expansion joints..2 Concrete curbs. 1.2 Related Work Specified Elsewhere.1 Asphalt pavement by Section Reference Standards.1 Canadian Standards Association: CSA A Concrete Materials and Methods of Concrete Construction CSA A5 - Portland Cement/Masonry Cement/Blended Hydraulic Cement CSA A Methods of Test for Concrete CSA A Chemical Admixtures for Concrete CSA A Air Entraining Admixtures for Concrete.2 Ontario Provincial Standard Drawing OPSD Concrete Sidewalk OPSD Concrete Barrier Curb OPSD Method of Termination for Concrete Curb & Gutter 1.4 Requirements of Regulatory Agencies.1 Materials and workmanship shall comply with the requirements of the following: (a) (b) (c) (d) Design of Concrete Structure (CSA A23.3) CRSI Manual of Standard Practice. Concrete Materials and Methods of Concrete Construction (CSA A23.1). Ontario Building Code

2 WATSON ROAD FACILITY PAGE 2 OF Dimensions.1 Check all dimensions at site before commencing work and report all discrepancies to the Consultant. Where dimensions are not available before work is commenced, the dimensions required shall be agreed upon between the various trades concerned and approved by the Consultant. 1.6 Examination.1 Examine the work upon which the work of this Section depends and report all defects and discrepancies to the Consultant. Do not commence the work of this Section until all defects have been corrected. Commencement of work shall imply acceptance of surfaces and conditions. 1.7 Project Records.1 Concrete Pour Records: Record the time, date, delivery slip serial number, and location in the structure of each concrete pour, and identify the related test cylinders. Keep these records at the site until Project is completed..2 Delivery Records: File duplicate copies of concrete delivery slips on which shall be recorded: supplier, serial number of slip, date truck number, contractor, project, concrete class, volume in load, and time of first mixing of aggregate, cement and water. 1.8 Protection.1 Protect the Work of this Section from damage resulting from the Work of other Sections. Repair or replace, at no cost to Metrolinx, all work damaged due to the work of this Section. Work incorporating the use of oils and deleterious liquids shall not be performed on finished areas unless they are fully protected by approved methods. Cooperate with other trades to ensure finished work is not damaged. PART 2 - GENERAL 2.1 Materials.1 Concrete materials shall be as specified in CSA Standard A Water: Verify that no salts are present which will cause efflorescence..3 Cement: High Early Strength Portland Cement, Type Aggregate: Natural sand, gravel, or crushed rock. CSA Standard A23.1 shall

3 WATSON ROAD FACILITY PAGE 3 OF 7 govern for approval and control of fine and coarse aggregates, and their grading. Provide aggregate from the same source for entire project for concrete exposed to view..5 Plasticizing Admixture: To meet specified requirements of CSA Standard A266.2, type WN: Pozzolith of approved type as manufactured by The Master Builders Company Limited, or WRDA as manufactured by W.R. Grace & Co. Ltd. or Prozite by Sternson Limited, or PDA by Construction Chemicals Limited..6 Air Entraining Admixture: To meet specified requirements of CSA Standard A266.1: MBVR as manufactured by The Master Builders Company Limited, or Darex AEA as manufactured by W.R. Grace & Co. of Canada Limited, or N.V.R. by Sternson Limited, or Pro-Air by Construction Chemicals Limited..7 Lumber for forms shall be free from warp, straight and free from defects which would weaken the formwork or blemish the concrete..8 Expansion joint material shall be 12mm Sealtight Ceramar closed cell PVC foam joint filler as manufactured by W.R. Meadows, or approved equal..9 Caulking shall be Duoflex 333, multi-component, non-sag polysulphide sealant as manufactured by Sika Canada, or approved equal..10 Grout shall be M-bed standard non-shrink grout as manufactured by Sika Canada Inc., or approved equal..11 Form stripping agent shall be colourless non-staining mineral oil, free of kerosene..12 Cure and seal finish shall be W.R. Meadows 1220 White Pigmented Curing Compound. 2.2 Strength and Consistency.1 Ready-Mix concrete shall be suitable an C-1 exposure classification in accordance with CSA A23.1, and shall have a minimum compressive strength of 35 MPa at 7 days, a minimum cement content of 340 kg per cubic meter, a maximum water/cementing materials ratio of 0.40, a slump at time and point of discharge between 60 mm and 80 mm, and 6% air entrainment.

4 WATSON ROAD FACILITY PAGE 4 OF 7 PART 3 - GENERAL 3.1 Formwork.1 Forms shall conform to shapes, lines and dimensions of the members as called for on the plans and shall be of sufficient strength and rigidity to withstand the construction loads without undue deflection..2 The inside of all forms shall be carefully and thoroughly wetted before concrete is placed, or, when required, thoroughly coated with a non-staining, form release agent. Such coating shall be applied before reinforcing is placed..3 Provide all necessary removable bolts and separators to ensure that when formwork is removed, no metal will be within 25 mm of any exposed surface of concrete. Wire ties may be used on unexposed work..4 Forms shall be so constructed that the finished concrete will conform with the shapes, lines, grades and dimensions indicated on the drawings. In no place will the face of the concrete vary by more than 4 mm from the true line of the concrete. 3.2 Concrete Placement.1 Remove water from all footings, foundations and forms. Do not permit water to flow over or to rise on concrete within 24 hours of placing concrete..2 Remove mud, debris or other foreign substances from equipment and formwork..3 Concrete shall be delivered as close as possible to the point of placing, in a thoroughly mixed and uniform mass and shall be discharged with a satisfactory degree of uniformity. Complete the placing of concrete within 1 ½ hours after the introduction of the mixing water to the cement and aggregates. Do not add water to the mix after the concrete has left the plant..4 Concrete shall arrive at the site having a temperature of not less than 16 C nor greater than 32 C..5 Convey concrete from the mixer to the place of final deposit by methods which will prevent separation or loss of the ingredients..6 Place concrete as nearly as practicable in its ultimate position in order to avoid rehandling or flowing. Do not flow, push or drag concrete into place. Place concrete uniformly as rapidly as possible after leaving the mixer.

5 WATSON ROAD FACILITY PAGE 5 OF 7.7 Place concrete continuously until the section of the Work being placed is completed. Arrange placing of concrete to ensure that concrete which is partially set will not be subjected to shocks from the movement of men, equipment, materials. Protect concrete during placing and initial set period from rain or other precipitation..8 Unless otherwise directed by the Consultant, consolidate concrete during placing by means of vibrators. The frequency of vibration shall not be less than 6,000 cycles per minute. Vibrate thin walls or other thin reinforced concrete members with small diameter vibrators or by outside pneumatic or electric vibrators. Keep the vibrators off the reinforcement. Do not over vibrate so as to cause separation of the concrete materials. Work concrete around the reinforcement and into the corners of forms to prevent voids and honeycombing. Vibrate concrete as it is placed..9 While placing concrete, Contractor shall ensure that all forms remain plumb and true. All plumbing and levelling shall be carried out by skilled tradesmen. 3.3 Form Removal.1 All formwork shall be removed before backfilling..2 Leave forms in place until the concrete has attained sufficient strength to sustain its own weight in addition to any temporary or permanent load that may be placed upon it during the building of the structure..3 Formwork shall be removed in such a manner as to prevent damage to exposed corners and edges. 3.4 Patching and Finishing Concrete.1 After removing forms, inspect all concrete surfaces for poor joints, voids, stone pockets, or other defective areas permitted by the Consultant to be patched..2 Thoroughly wet and fill with mortar all the holes left by withdrawal of rods and the holes left by the removal of end ties..3 Remove fins, ridges and uneven edges to provide an acceptable appearance on exposed work. Grind or fill with mortar any surface irregularities caused by the springing or welling of individual form pieces in the formwork, or because of movement of the forms. 3.5 Cold and Hot Weather Concrete.1 During the cold and hot weather concreting the requirements of CSA Standard A23.1 shall be met.

6 WATSON ROAD FACILITY PAGE 6 OF Field Control of Concrete Quality.1 An inspection and testing company appointed by the Consultant will inspect and control concrete quality..2 The Contractor will pay for the services under the cash allowance for testing and inspection..3 The inspection company will take not less than three (3) cylinders for each day's operations when concrete is placed and tests shall comply with the method of testing concrete as specified in CSA A The inspection company will regularly submit reports of the results of all tests and inspections to the Consultant..5 Inspection or testing will not augment or replace Contractor's quality control nor relieve him of his contractual responsibility..6 Copy of mix designs, sieve analysis and specific gravity of aggregates with report from testing agency, shall be submitted to the Consultant for his review..7 Concrete which does not meet the specified strength requirements or which show excessive surface honeycombing or other serious defects, including defects due to rough handling, shall be rejected and replaced by the manufacturer at his own expense. 3.7 Miscellaneous Work.1 Supply (or receive if supplied under other Sections) and install under this Section, all sleeves, frames and any other items required to be set in the concrete. 3.8 Curing.1 All surfaces of newly placed concrete shall be kept moist and shall be properly protected against drying for a period of at least three (3) days. The temperature of the concrete shall be maintained between 10 C and 27 C during this period. 3.9 Concrete Curbs.1 Install expansion and contraction joints at intervals of 6m..2 Install expansion joints around manholes and catch basins and along length adjacent to concrete curb, catch basins, buildings, or permanent structure..3 Seal joints with approved sealant.

7 WATSON ROAD FACILITY PAGE 7 OF 7.4 After concrete has cured for specified curing time and when surface of concrete is dry, apply two (2) coats of linseed oil mixture uniformly to surfaces of curbs, walks and gutters..5 Allow concrete to cure for seven (7) days prior to backfilling Sidewalk, Walkways and Pads.1 The grades shall be set by screeding, darbying, or bull floating to within a tolerance of + 4 mm as measured by a 3 m screed..2 Expansion joints shall be located where shown on the OPSD drawings and all joint locations shall be approved by consultant prior to placing..3 Finishing of slabs shall be done by skilled personnel qualified for this type of work..4 Provide a broomed finish at sidewalks..5 Protect finished slabs against damage. End of