������������������������ SECTION 02276

 

�������������� MODULAR CONCRETE RETAINING WALLS

This section is based on products nationally manufactured under license from Anchor Wall Systems, Inc., at the following address:

���� 6101 Baker Road, Suite 201

���� Minnetonka, MN� 55345

���� Telephone 800-473-4452.

Call for the location of the manufacturer nearest you.

 

"Anchor Vertica," "Anchor Vertica Pro," and "Anchor Diamond" modular concrete wall units ensure proper alignment and precise set-back without need for mortar or pins due to their integral alignment feature.�

 

PART 1� GENERAL

 

1.1 SECTION INCLUDES

 

��� A.� Modular concrete retaining wall units to the lines and grades designated on the construction drawings and as specified herein.

 

1.2 RELATED SECTIONS

Delete any sections below not relevant to this project;� add others as required.

��� A.� Section 02220 - Excavating, Backfilling, and Compacting.

 

��� B.� Section 02900 - Landscaping.

 

��� C.� Section 02710 - Subdrainage Systems.

 

1.3 REFERENCES

Delete references from the list below that are not actually required by the text of the edited section.

��� A.� ASTM C 90 - Standard Specification for Load-Bearing Concrete Masonry Units.

 

��� B.� ASTM C 666 - Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing.

 

��� C.� ASTM D 448 - Standard Classification for Sizes of Aggregate for Road and Bridge Construction.

 

��� D.� ASTM D 698 - Standard Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3) (600 kN-m/m3).

 

��� E.� ASTM D 1557 - Standard Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2,700 kN-m/m3).

 

1.4 SUBMITTALS

 

��� A.� Submit under provisions of Section 01300.

 

��� B.� Product Data:� Manufacturer's printed product literature, including installation instructions.

 

��� C.� Shop Drawings:� Retaining wall system design including wall heights, geosynthetic reinforcement and drainage provisions.

Delete the following paragraph if samples are not required.

��� D.� Samples:�

������� 1.� Furnish units in the color and face pattern specified.

������� 2.� 12 inches square or larger piece of geosynthetic reinforcing specified.

 

��� E.� Certificates:� Submit manufacturer's certification and test reports demonstration compliance of concrete unit with reference standards.

 

1.5 DELIVERY, STORAGE AND HANDLING

 

��� A.� Inspect the materials upon delivery to assure that specified products have been received.

 

��� B.� Deliver and handle materials in manner that will prevent damage.�

������� 1.� Store above ground on wood pallets or blocking.

������� 2.� Remove damaged or otherwise unsuitable material, when so determined, from the site.

������� 3.� Faces of the modular concrete units shall be free of chips, cracks and stains.

 

��� C.� Prevent wet cement, epoxy, excessive mud, etc., from coming in contact with the materials.

Delete the following Article if extra materials are not required.

1.6 EXTRA MATERIALS

 

��� A.� Furnish Owner with matching replacement units comprising 1 percent of those installed on the Project.

 

 

PART 2� PRODUCTS

 

2.1 MANUFACTURERS

 

��� A.� Provide products fabricated under license from Anchor Wall Systems, Inc., 8309 Brooklyn Blvd., Brooklyn Park, MN� 55445.� Telephone 800-473-4452.�

 

2.2 MATERIALS

Delete 2 of the 3 following paragraphs.

��� A.� "Anchor Vertica Pro Retaining Wall Units":� High strength, high density concrete units, freeze-thaw resistant with top locator providing a 4 degree set back from plane with each course.

 

��� B.� "Anchor Vertica Retaining Wall Units":� High strength, high density concrete units, freeze-thaw resistant with top locator providing a 4 degree set back from plane with each course.

 

��� C.� "Anchor Diamond Retaining Wall Units":� High strength, high density concrete units, freeze-thaw resistant with rear alignment flange providing a 1-1/8" set back from plane with each course.

������� 1.� Concrete wall units shall meet requirements of ASTM C 90 except compressive strength shall be a minimum of 3,000 psi and the maximum water absorption shall be limited to 7.0 percent.

������� 2.� The concrete wall units shall have adequate freeze thaw resistance in accordance with ASTM C 666, modified to 50 cycles.

������� 3.� Color as selected by Architect from manufacturer's standard selections.

Delete 1 of the 2 following paragraphs.

������� 4.� Face geometry:� Beveled.

������� 5.� Face geometry:� Straight.

Delete 1 of the 2 following paragraphs.

������� 6.� Texture:� Smooth.

������� 7.� Texture:� Split/Rock Face.

������� 8.� The concrete units shall be positively interlocked with integral shear connections.

������� 9.� Unit dimensions shall not vary more than � 1/16 inch from that in any molded dimension.

������� 10. Exterior dimensions may vary.� Concrete wall units are required to have the following minimum face area:

Delete 2 of the 3 following paragraphs.

������� 11. Anchor Vertica units:� 0.94 or 1.0 square feet.

������� 12. Anchor Vertica Pro units:� 0.94 or 1.0 square feet.

������� 13. Anchor Diamond units:� 0.67 square feet.

 

��� D.� Geosynthetic reinforcement:�

Delete 2 of the 3 following paragraphs.

������� 1.� Polyester woven fiber geogrid.

������� 2.� Polyethylene expanded sheet geogrid.

������� 3.� Polypropylene woven geotextile.

 

��� E.� Base:�

Delete 2 of the 3 following paragraphs.

������� 1.� Drainage aggregate.

������� 2.� Sand, specified in Section _____.

������� 3.� Concrete, specified in Section 03300.

 

��� F.� Drainage aggregate:� Free-draining, coarse aggregate complying with ASTM 448, size no. 57, 67, 6, 7 or 8.

 

��� G.� Backfill:� On-site soils unless otherwise indicated on the Drawings.�

Delete the following paragraph if drain tile is not required by project conditions.

��� H.� Foundation Drain:� Specified in Section 02710.

 

 

PART 3� EXECUTION

 

3.1 EXAMINATION

 

��� A.� Examine the areas and conditions under which retaining walls are to be erected and notify the Architect in writing of conditions detrimental to the proper and timely completion of the work.� Do not proceed with the work until unsatisfactory conditions have been corrected.

 

3.2 EXCAVATION

 

��� A.� Excavate to the lines and grades shown on the drawings.� Over-excavation will not be compensated and replacement with compacted fill or wall system components will be required at Contractor's expense.� Take care not to disturb base beyond the lines shown.

 

3.3 FOUNDATION PREPARATION

 

��� A.� Excavate as required for footing or base dimension shown on the drawings, unless otherwise directed.

 

��� B.� Obtain the Geotechnical Engineer's approval of subgrade to ensure that the actual soil strength meets or exceeds that required.

 

��� C.� Remove soil not meeting the required strength, and replace with acceptable material.

 

��� D.� Fill over-excavated areas with compacted backfill material.

 

��� E.� Proof-roll foundation soil prior to fill and geosynthetic reinforcement placement.

 

3.4 BASE COURSE PREPARATION

Show required base thickness on the drawings.� Edit the following paragraph, if necessary.

��� A.� Place granular base materials as indicated on the Drawings, but not less than 6 inches thick.

 

��� B.� Place base materials upon undisturbed soils.

 

��� C.� Compact base material so as to provide a level, hard surface on which to place the first course of units.

Delete 1 of the 2 following paragraphs, and edit to include required compaction.

������� 1.� Compact to _____ percent standard proctor (ASTM D 698).

������� 2.� Compact to _____ percent modified proctor (ASTM D 1557).

 

��� D.� Prepare base materials to ensure complete contact of retaining wall unit with base material.� Do not allow gaps.

 

��� E.� Place and compact base materials to the depths and widths indicate on the drawings.

Show base depth and width on the Drawings.� Standard minimum base thickness is 6 inches.

 

Designs using reduced depth of aggregate and 1 to 2 inch concrete toppings may be used.� Concrete shall be lean, unreinforced and a maximum of 2 inches thick.� Where a reinforced footing is required, place below the frost line.� Show any such footings on the Drawings.

3.5 ERECTION

 

��� A.� Erect units in accordance with manufacturer's recommendations and as specified herein.

 

��� B.� Place first course of concrete wall units on the prepared base material.� Check units for level and alignment.� Ensure that the top of all units in base course are at the same elevation.

 

��� C.� Ensure that concrete wall units are in full contact with base.

 

��� D.� Place concrete wall units side by side for full length of wall alignment.� Alignment may be done by using a string line or offset of wall line.

 

��� E.� Fill all voids with drainage aggregate.

Delete 1 of the 2 following paragraphs.�

 

Anchor Vertica and Anchor Diamond units require 12 inches of fill.

Anchor Vertica Pro units may require as little as 6 inches of fill.�

��� F.� Place at least 12 inches of free-draining aggregate behind the concrete wall units.

 

��� G.� Place at least 6 inches of free-draining aggregate behind the concrete wall units.

 

��� H.� Remove any excess fill from top of concrete wall units and install next course.� Ensure that drainage aggregate and backfill are compacted before installation of next course.

Delete 1 of the 2 following paragraphs.�

 

Retain only the first for Anchor Vertica and Anchor Vertica Pro units.

Retain only the second for Anchor Diamond units.

��� I.� Install each succeeding course so the side slots are in contact with the locator.� Pull the units forward until the side slot of the unit touches the back of the locator of the previous course.� Backfill as each course is completed.

 

��� J.� Install each succeeding course with the lip of the units placed against the back of the preceding course.� Pull the units forward as far as possible.� Backfill as each course is completed.

 

��� K.� Install geosynthetic reinforcement in accordance with retaining wall manufacturer's recommendations.

 

3.6 CAP UNIT INSTALLATION

 

��� A.� Apply construction adhesive to the top surface of the unit below and place the cap unit into desired position.

 

��� B.� Cut cap units if necessary to obtain the proper fit.

 

��� C.� Backfill and compact to finish grade.

 

3.7 ADJUSTING AND CLEANING

 

��� A.� Replace any damaged units prior to Substantial Completion.

 

��� B.� Remove debris and scrap from the site.

 

��� C.� Leave adjacent paved areas broom clean.

 

 

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