SECTION_32_05_10_Backfilling_Roadways.docx
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SECTION 32 05 10 BACKFILLING ROADWAYS
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SECTION 32 05 10
SECTION 32 05 10
BACKFILLING ROADWAYS
| PART 1 | GENERAL |
| 1.1 | SECTION INCLUDES |
| A. | Roadway backfill materials. |
| B. | Roadway backfilling requirements. |
| 1.2 | DEFINITIONS |
| A. | Embankment: A raised earthen structure to carry a roadway. |
| B. | Pavement: Artificially covered surfaces including but not limited to roadway surfaces, parking lot surfaces, sidewalks, curb, gutter, curb ramps, Driveway ramps, etc. |
| C. | Subgrade: A surface of earth or Rock leveled off as to receive backfill materials. |
| 1.3 | SUBMITTALS |
| A. | Submit maximum laboratory dry density and optimum laboratory moisture content for: |
| 1. | Subgrade material, and |
| 2. | Each type of fill to be used. |
| B. | Submit aggregate batch delivery tickets showing name of material source, Serial number of ticket; date and truck number; name of Supplier; job name and location; volume of material delivered, And aggregate classification. |
| C. | Upon COR’s request, submit a written quality control Inspections and testing report describing source and field quality control activities performed by Contractor and its Suppliers. |
| 1.4 | QUALITY ASSURANCE |
| A. | Do not change material sources, or aggregate without COR’s approval. |
| B. | Reject backfill material that does not comply with requirements specified in this section. |
| 1.5 | STORAGE |
| A. | Safely stockpile backfill materials. |
| B. | Separate differing materials, prevent mixing, and maintain optimum moisture content of backfill materials. |
| C. | Avoid displacement of and injury to Work while compacting or operating equipment. |
| D. | Movement of construction machinery over Work at any stage of construction is solely at Contractor's risk. |
| 1.6 | SITE CONDITIONS |
| A. | Do not place, spread, or roll any backfill material over material that is damaged by water. Remove and replace damaged material at no additional cost to Government. |
| B. | Control traffic and erosion. Keep area free of trash and debris. Repair settled, eroded, and rutted areas. |
| C. | Reshape and compact damaged structural section re required density. |
| D. | Soil Cement: Do not spread soil cement mixture when air temperature is less than 40 deg. F. in the shade. |
| E. | Drainage: Immediately prior to suspension of construction operations for any reason, provide proper and necessary drainage of Work area. |
| 1.7 | ACCEPTANCE |
| A. | General: |
| 1. | Native material may be wasted as directed by COR, if there is no additional cost to substitute material acceptable to COR. |
| 2. | For material acceptance refer to. |
| a. | Common fill, Section 31 05 13. |
| b. | Crushed aggregate base, Section 32 11 23. |
| c. | Cement treated fill, Section 31 05 15. |
| B. | Backfilling: One test per Lot. |
| Material |
| Lot Size |
| Subgrade (a) |
| 1000 square yards |
| Common Fill (a) |
| PCC or AC Surface Course: 1,000 square yards per lift. |
Driveway Approach: 400 square feet per lift.
Sidewalk: 400 lineal feet per lift.
| Crushed Aggregate Base (a) |
| PCC or AC Surface Course: 1,000 square |
yards per lift.
Driveway Approach: 400 square feet per lift.
Sidewalk: 400 lineal feet per lift.
Curb, Gutter, and Waterways: 200 lineal feet per lift.
| Flowable Fill (b) |
| 250 cubic yards |
NOTES
(a) Proctor density, Section 31 23 26.
(b) Cement Treated Fill, Section 31 05 15.
(c) Lift thickness before compaction, 8 inches.
| 1.8 | WARRANTY |
| A. | Any settlement noted in Embankment or Pavement construction will be considered to be caused by improper compaction methods and shall be corrected at no cost to the Government. |
| B. | Restore incidentals damaged by settlement at no additional cost to Government. |
| PART 2 | PRODUCTS |
| 2.1 | BACKFILL MATERIALS |
| A. | Common Fill, Section 31 05 13. |
| B. | Crushed aggregate base, Section 32 11 23. |
| C. | Cement treated fill, Section 31 05 15. |
| 2.2 | ACCESSORIES |
| A. | Water: |
| 1. | Make arrangements for sources of water during construction and make arrangements for delivery of water to site. |
| 2. | Comply with local Laws and Regulations at no additional cost to Government when securing water from water utility company. |
| B. | Geotextile Fabric, Section 31 05 19. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | Verify. |
| 1. | Backfill material meets gradation requirements. |
| 2. | Areas to be backfilled are free of debris, snow, ice or water, and |
| 3. | Bearing surfaces are not frozen. |
| B. | If extra excavation is required, secure COR’s written permission and follow Section 31 23 16 requirements. |
| C. | Place geotextile fabrics, Section 31 05 19. |
| 3.2 | SUBGRADE PREPARATION |
| A. | Protect Subgrade from desiccation, flooding, and freezing. |
| B. | If ground water table is in the intended construction operations, dewater. |
| C. | Before beginning backfilling operations over Subgrade, secure ENGINEER's review of Subgrade surface preparations. |
| 3.3 | EMBANKMENTS |
| A. | Place backfill material in lifts not exceeding 8 inches after compaction. |
| B. | Build shoulders to a grade higher than that of adjacent fills. Provide surface runoff at all times. |
| C. | Commence compaction along edge of area to be compacted and gradually advance toward center. |
| D. | Operate compaction equipment along lines parallel or concentric with the center-line of the Embankment being constructed. |
| E. | Do not damage subsurface structures or utilities. |
| 3.4 | BASE COURSES |
| A. | Place backfill material in lifts not exceeding 8 inches before compaction. |
| B. | Maintain moisture content in compaction operations. |
| C. | Avoid segregation when spreading backfill. Keep surfaces free from pockets of coarse and fine aggregate. |
| D. | Rework fills which do not conform to compaction requirements until requirements are met. |
| E. | Protect cement treated fill against freezing and traffic for 7 days. |
| 3.5 | MODIFIED BACKFILL LAYER METHOD |
| A. | Section 33 05 20. |
| 3.6 | COMPACTION |
| A. | Compact backfill, Section 31 23 26 as follows. |
| 1. | A-1 soils: greater than or equal to 95 percent of a Modified Proctor Density. |
| 2. | Other soils: greater than or equal to 95 percent of a Standard Proctor Density. |
| 3.7 | COMPRESSIVE STRENGTH |
| A. | Where a flowable fill is used, provide compressive strength indicated in Section 31 05 15. |
| 3.8 | PROOF ROLLING TEST |
| A. | Prior to placing fill material for roadbed backfills, proof roll Subgrade using gross weight of 18,000 pounds/tandem axle, with a tire pressure at least 90 psi. |
| B. | All proof roll passes will traverse the Subgrade parallel to the roadbed centerline. All subsequent passes will be offset 1/2 the vehicle width until the entire Subgrade is tested. |
| C. | COR will designate the areas, if any, requiring additional compaction or reconstruction. |
| D. | Once Subgrade passes the proof rolling test, protect the surface from construction operations and traffic damage. Repair all cuts, ruts, and breaks. Keep surface in a satisfactory condition until geotextile fabric or base course has been placed. |
| 3.9 | CLEANING |
| A. | Remove stockpiles from the site upon Work Completion. Grade site to prevent free standing surface water. |
| B. | Leave borrow areas clean and neat. |
END OF SECTION
BACKFILLING ROADWAYS Page 1
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