31 60 00 FOUNDATION PREPARATION.doc

SECTION 31 60 00

FOUNDATION PREPARATION

PART 1 GENERAL

1.1 REFERENCES

1.1.1 The latest issue of the publications listed below and referenced to thereafter by basic designations only, forms a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

1.1.1.1 ACI INTERNATIONAL (ACI)

a. ACI 506.2 Specification for Shotcrete

1.1.1.2 ASTM INTERNATIONAL (ASTM)

a. ASTM A 185/A 185M Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete

b. ASTM C 270 Standard Specification for Mortar for Unit Masonry

c. ASTM C 387/C 387M Standard Specification for Packaged, Dry, Combined Materials for Mortar and Concrete

1.2 DEFINITIONS

1.2.1 Foundations

1.2.1.1 The rock foundation shall be comprised of the rock surfaces upon which embankment and concrete structures are placed. Vertical surfaces, where permitted or required by these specifications, are included.

1.3 UNIT PRICES

1.3.1 Preliminary Cleanup

1.3.1.1 Payment

a. Payment shall be made for costs for each preliminary cleanup satisfactorily performed at the direction of the Contracting Officer. Payment shall be made for each cleanup of the same area if more than one cleanup has been directed and satisfactorily performed.

1.3.1.2 Measurement

a. Preliminary cleanup shall be measured for payment by determining the area cleaned to the nearest square yard.

1.3.1.3 Unit of Measure

a. Unit of measure: square yard.

1.3.2 Final Cleanup

1.3.2.1 Payment

a. Payment shall be made for costs associated with final cleanup of the area for each type of foundation preparation that has been satisfactorily prepared. Where preliminary cleanup has been directed and performed and the Contractor subsequently performs final cleanup, payment shall be made for preliminary cleanup. Payment shall not be made for any cleanup subsequent to final cleanup.

1.3.2.2 Measurement

a. Final cleanup shall be measured for payment by determining the area cleaned to the nearest square yard.

1.3.2.3 Unit of measure

a. Square yard.

1.3.3 Foundation Preparation

1.3.3.1 Payment

a. Payment shall be made for costs associated with foundation preparation of the area for each type of foundation preparation that has been satisfactorily prepared. Where preliminary cleanup has been directed and performed and the Contractor subsequently performs foundation preparation, payment shall be made for foundation preparation. Payment shall not be made for more than one foundation preparation of the same area.

1.3.3.2 Measurement

a. Foundation preparation shall be measured for payment by determining the area prepared to the nearest square yard.

1.3.3.3 Unit of measure

a. Square yard.

1.3.4 Dental Concrete

1.3.4.1 Payment

a. Payment shall be made for costs associated with dental concrete placed.

1.3.4.2 Measurement

a. Dental concrete shall be measured for payment by determining the volume to the nearest one-tenth cubic yard.

1.3.4.3 Unit of measure

a. Cubic yard.

1.3.5 Dental Mortar

1.3.5.1 Payment

a. Payment shall be made for costs associated with dental mortar placed.

1.3.5.2 Measurement

a. Dental mortar shall be measured for payment by determining the volume to the nearest one-tenth cubic yard.

1.3.5.3 Unit of measure

a. Cubic yard.

1.3.6 Shotcrete

1.3.6.1 Payment

a. Payment shall be made for costs associated with shotcrete satisfactorily placed.

1.3.6.2 Measurement

a. Shotcrete shall be measured for payment by determining the area satisfactorily covered to the nearest square yard.

1.3.6.3 Unit of measure

a. Square yard.

1.3.7 Protective Coating

1.3.7.1 Payment

a. Payment shall be made for costs associated with protective coating satisfactorily applied. Separate payment shall not be made for reapplication necessary due to damage by construction activities, fault or negligence of the Contractor, or failure of the Contractor to prosecute the work in a timely manner. Otherwise, separate payment shall be made for each reapplication directed and satisfactorily performed.

1.3.7.2 Measurement

a. Protective coating shall be measured for payment by determining the area satisfactorily covered to the nearest square yard.

1.3.7.3 Unit of measure

a. Square yard.

1.4 SUBMITTALS

1.4.1 Government approval may be required on any of the following items. Items requiring submittals shall be listed on the AF Form 66. Copies of all submittals shall be provided per the requirements in Section 01 33 00, Submittal Procedures, or as listed on the AF Form 66.

1.4.2 SD-03 Product Data

1.4.2.1 Tools

a. Tabular list of light power tools to be used in lieu of hand tools shall be submitted for approval prior to their use on the job site.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Welded Wire Fabric

2.1.1.1 Welded wire fabric used shall be 6 by 6 inches - W3 x W3, conforming to ASTM A 185/A 185M.

2.1.2 Filter Material

2.1.2.1 Filter material shall consist of Sand, Gravel, Crushed Stone. The filter material shall be composed of tough, durable particles, reasonably free from thin, flat and elongated pieces, and shall contain no organic matter nor soft, friable particles in quantities considered objectionable by the Contracting Officer.

2.1.2.2 The filter materials shall be well-graded between the limits shown. Gravel shall not be crushed stone. At least one test shall be performed on each 2,000,000 lb to be delivered to the project site for each gradation band. All points on individual grading curves obtained from representative samples of filter material shall lie between the boundary limits as defined by smooth curves drawn through the tabulated grading limits plotted on a mechanical analysis diagram. The individual grading curves within these limits shall not exhibit abrupt changes in slope denoting either skip grading or scalping of certain sizes or other irregularities which would be detrimental to the proper functioning of the filter.

PART 3 EXECUTION

3.1 EXAMINATION

3.1.1 The limits of the proposed foundations for the various parts of the work are approximately as indicated. The Contracting Officer reserves the right to change the depth to, or the width of, the foundations if, conditions exposed in the foundation excavations, or as determined by exploratory drilling, warrant such modifications.

3.2 PREPARATION

3.2.1 Equipment

3.2.1.1 Tools

a. Hand tools, where required or permitted by these specifications include, but are not limited to shovels, bars, picks, wedges, and brooms. Light power tools may be used in lieu of hand tools only when such use is approved.

3.3 PRELIMINARY CLEANUP

3.3.1 When the excavation has reached the approximate limits shown or when the Contracting Officer determines that a satisfactory foundation may have been reached, the Contracting Officer may direct that a preliminary cleanup be performed on all or any part of the rock foundation surface. This cleanup shall consist of removing all debris, loose rock, sand, silt, and other objectionable material by hand tools followed by air, water, air/water jets or any combination of additional methods approved or directed. The Contracting Officer may require that the excavation be continued and the preliminary cleanup procedure repeated until a satisfactory foundation surface can breached.

3.4 FINAL CLEANUP AND FOUNDATION PREPARATION

3.4.1 Unless otherwise directed, Final Cleanup and Foundation Preparation, Structural, Embankment, shall be performed. This work shall consist of removing loose and/or weather rock and pockets of fines, sand, rock rubble or gravel and other objectionable material from the in place rock surface including areas of depression, large crevices, and open rock joints. Mechanical equipment may be used but such equipment shall be rubber tired only. Picking, barring, and hand excavation may be necessary to obtain a foundation surface free from loose, drummy, or shattered materials. Irregularities in the rock surfaces shall be trimmed to form a reasonable uniform slope on the abutments. Slopes shall not be steeper than indicated. Overhangs shall not be permitted at any location. Overhangs shall be excavated and backfilled with compacted filter granular materials. Vertical surfaces shall not be permitted and benches between vertical surfaces shall be of such width so as to a stepped slope comparable to the adjacent uniform slope. The final rock surface shall be thoroughly cleaned by use of air jets, water jets, air/water jets or other approved method and shall be maintained in a clean condition until the placement of embankment or concrete thereon.

3.5 TESTS

3.5.1 General

3.5.1.1 The Contractor shall establish and maintain quality control for foundation preparation operations to assure compliance with contract specifications and shall maintain records of his quality control for all operations including but not limited to the following:

a. Equipment

(1) Quantity and type.

b. Foundation Excavation

(1) Strict adherence to foundation excavation limits and depths.

c. Inspection, Mapping, and Cleanup

(1) Orderly prosecution of inspections, mapping, and cleanup of foundation excavation areas.

3.5.2 Reports

3.5.2.1 Three copies of these records of inspection as well as corrective action taken shall be submitted daily.

3.6 FOUNDATION INSPECTION AND GEOLOGIC MAPPING

3.6.1 Inspections to determine adequacy of the foundations shall be performed by the Contracting Officer in all foundation areas between completion of excavation and placement of embankment, or concrete, or protective treatment. The Contractor shall cooperate to the extent necessary to assist in inspection and mapping activities which may require additional survey control points and access. The Contractor shall coordinate his schedule for foundation excavation and preliminary cleanup with the Contracting Officer to insure that the cleanup, inspection, and mapping proceed in an orderly manner.

END OF SECTION 31 60 00

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31 60 00-5 03/16/10