02336-imported_fill.docx

SECTION 02336

IMPORTED STRUCTURAL FILL

PART 1 - GENERAL

1.1 - Description A. This section specifies imported structural fill to be furnished, placed and compacted to meet grades that are shown on the drawings for the concrete walks, concrete slabs and other miscellaneous concrete items.

1.2 - Related Work Specified Elsewhere 01410 – Testing and Quality Control

02317 – Excavation and Backfill for Structures

PART 2 - PRODUCTS

2.1 - Fill Material

A. Materials shall not contain organic, frozen, or other unsuitable material. Materials must be approved by the COR prior to use.

1. Structural Fill Material. Material containing no rock larger than 3 inches in greatest dimension; 15% Maximum passing the No. 200 Sieve, ASHTO T 27 and T 11; a 30% Maximum Liquid Limit, ASSHTO T 89.

PART 3 - EXECUTION

3.1 – Foundation Excavation and Preparation

A. Footing Keyed into Undisturbed Material: Excavate the foundation to the limits of the footing and compact foundation. Where material does not stand vertically, fill all space between the limits of the footing and the remaining undisturbed material with concrete.

B. Excavation shall be made to the required depth and to a width that will permit the installation and bracing of forms REGARDLESS OF THE NATURE OF MATERIAL ENCOUNTERED.

C. All soft and yielding material shall be removed and replaced with imported Structural Fill Material.

D. The foundation shall be shaped and compacted to a firm even surface conforming to the section shown in the drawings.

3.2 – Structural Fill Construction

A. Where fill construction is required to bring the grades to the elevations shown on the drawings, the fill shall be placed in uniform lifts. Maximum lift thickness shall be 8 inches loose unless otherwise specified. Each lift shall be compacted to a minimum of 95% of maximum density per ASTM D 1557.

B. Deposit crushed aggregate as specified in Section 02725 as the final lift underneath the slabs/sidewalks as shown on the drawings and on the outside edge of concrete slab where applicable.

3.3 – Compaction of Imported Structural Fill.

A. Determine optimum Moisture content and maximum density according to AASHTO T 99, Method C. Adjust the moisture content of the backfill material to a moisture content suitable for compaction.

B. Compact material placed in all layers to at least 95% of the maximum density. Determine in place density and moisture content according to AASHTO T 310 or other approved test procedures.

3.4 - Grading

A. Grade exterior surfaces uniformly to blend with adjacent ground.

3.5 - Excess or Unsuitable Excavated Material

A. Remove all excess material from the site, and stockpile in designated areas as designated in field by the COR.

3.6 - Excavated Rock

A. Excavated rock shall be disposed of in the designated area as designated in field by the COR.

PART 4 - MEASUREMENT AND PAYMENT

4.1 - Method of Measurement

A. Measurement will be for cubic yards of structural fill material furnished, placed and compacted. Excavation for footings shall be considered incidental to item .

4.2 - Basis of Payment

A. Payment for this item shall be made as follows:

Pay Item Description Pay Unit

02336(01) Imported Structural Fill, In Place CY For Shelter Slab

02336(02) Imported Structural Fill, In Place CY For Parking Slab and Sidewalk Slab

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