This master should be used by designers working on Port of Portland construction projects and by designers working for PDX tenants (“Tenants”). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and edited to fit specific project needs.

SECTION 321615 - CONCRETE SIDEWALK

PART 1 - GENERAL

1.1DESCRIPTION

  1. This section includes construction of castinplace concrete sidewalk.

1.2RELATED WORK SPECIFIED ELSEWHERE

  1. Section 031100, Concrete Formwork
  2. Section 033000, CastInPlace Concrete
  3. Section 312000, Site Clearing and Earthwork

PART 2 - PRODUCTS

2.1CONCRETE

  1. Concrete shall conform to the requirements of Sections031100 and 033000 for concrete Class35003/4.

2.2EXPANSION MATERIAL

  1. Premolded, nonextruding filler material, 1/2inch minimum thickness.

2.3CURING COMPOUND

  1. See Section 033000, Cast-in-Place Concrete.

PART 3 - EXECUTION

3.1PREPARATION

  1. Compact the subgrade as specified in Section 312000, Site Clearing and Earthwork. Immediately prior to placing the concrete, thoroughly wet the subgrade to prevent moisture loss from the concrete mix to the subgrade.

3.2JOINTS

  1. Construct in accordance with the drawings.

3.3PLACEMENT AND FINISHING

  1. The concrete forms, if of wood, shall be sprayed, oiled or otherwise covered with an impermeable membrane before use.
  2. Forms shall be removed after the concrete has taken itsinitial set and while the concrete is still green. Minor defects shall be repaired with mortar containing one part portland cement and two parts sand. Plastering will not be permitted on the faces and exposed surfaces. Honeycombed and other structurally defective concrete shall be removed and replaced at no added cost to the Port.
  3. Surface of sidewalk shall be “broom” finished with strokes at right angles to length. Edges shall be smoothly finished with an edging tool and be free of broom marks.
  4. Surfaces from which forms are removed before the curing period has elapsed shall be protected and cured as specified for surfaces not covered by forms.

3.4CURING AND PROTECTION

  1. Apply curing compound to exposed surfaces immediately after finishing. Apply in sufficient quantity to obscure natural color of the concrete.
  2. After finishing has been completed, cover the concrete with an impermeable membrane or keep continuously wet until the concrete has reached a compressive strength of at least 2500psi.

3.5TOLERANCES

  1. The finished sidewalk shall be within 1/4 inch, plus or minus, of finish grade and alignment when tested with a 10foot straightedge.

END OF SECTION321615

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