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| The subgrade should have a uniform bearing capacity, be level or uniformly sloped, and be free of sod, organic matter, large rocks, concrete residues, etc. Any filled sections should be compacted by successive layers that do not exceed 300 mm. They should also extend at least 300 mm outside the form line. |
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The subbase in contact with the concrete must be composed of a free draining material (20 mm clean, crushed rocks). This material must be well compacted during the final levelling to prevent any excessive movement of the foundation when the structure is in use. Levelling must be done to ensure uniformity in the concrete section of the sidewalk. The subbase section should extend beyond the sidewalk section on all sides.
A drain installed at the base of the sidewalk is necessary to evacuate the water coming from the foundation of the sidewalk and the street towards the well. This drainage is essential to minimize the ground’s movements during the freezing and thaw periods.
Forms should be straight, free from warping, and strong enough to ensure true, vertical lines. When using a slipform machine, test a specific section to verify the conformity of the forms used.
Isolation and expansion joints should be planned, positioned, and ready to be made before concrete placement.
